Author: 仙果
附记：一个月以前分析的，文章中大概以我翻译的那篇文章为思路，进行分析，补充了文章里的一些细节，好不容易找到的，POC样本已经找不到了。
比较可惜。翻译文章的链接地址为：对PDF _CVE-2009-3459分析文章的翻译
[ 目录 ]
0×00 漏洞公告
0×01 漏洞调试分析
0×01_0 触发漏洞
0×01_1 控制程序执行流程
0×02 Adobe Readr堆管理系统
0×03 总结
0×00 漏洞公告
Heap-based buffer overflow in Adobe Reader and Acrobat 7.x
before 7.1.4, 8.x before 8.1.7, and 9.x before 9.2 allows remote
attackers to execute arbitrary code via a crafted PDF file that
triggers memory corruption, as exploited in the wild in October 2009.
NOTE: some of these details are obtained from third party information.
0×01 漏洞调试分析
0×01_0 触发漏洞
在PDF中，由于参数值触发的初始化整数溢出
25 0 obj<</Length 299/Filter/FlateDecode/DecodeParms<<
/Columns 1
/Predictor 2
/BitsPerComponent 1
/Colors 1073741838 //此处就是为关键参数，触发漏洞的关键点.
>>>>stream
009f60a5 8d148d48000000 lea edx,<Unloaded_util.dll>+0x47 (00000048)[ecx*4] //ecx=0x4000000e
009f60ac 89442424 mov dword ptr [esp+24h],eax //eax=0x0
009f60b0 8954241c mov dword ptr [esp+1Ch],edx //0x80保存到[esp+1ch]中
009f60b4 8b4c2410 mov ecx,dword ptr [esp+10h] //ecx赋值为0x0
009f60b8 8b442414 mov eax,dword ptr [esp+14h] //eax赋值为0x0
009f60bc 83c003 add eax,3 //eax=eax+0x3=0x3
009f60bf 83e0fc and eax,0FFFFFFFCh //相与，为0x0
009f60c2 8d6c0703 lea ebp,[edi+eax+3] //ebp=0x08000005
009f60c6 83e5fc and ebp,0FFFFFFFCh //ebp=0x08000004
009f60c9 8bd5 mov edx,ebp
009f60cb 0faf542470 imul edx,dword ptr [esp+70h]
009f60d0 03542418 add edx,dword ptr [esp+18h] //edx=0x0
009f60d4 89442414 mov dword ptr [esp+14h],eax
009f60d8 8d048a lea eax,[edx+ecx*4] //eax=0x0
009f60db 0344241c add eax,dword ptr [esp+1Ch] //eax=0x80
009f60df 8b4c2428 mov ecx,dword ptr [esp+28h] //ecx=0x03ddcf88
009f60e3 50 push eax
009f60e4 51 push ecx
009f60e5 e836010000 call AcroRd32_950000!AVAcroALM_IsFeatureEnabled+0x627c1 (009f6220)
009f60ea 8bd8 mov ebx,eax //eax=0213208c ,0x80大小的缓冲区指针
009f60ec 83c408 add esp,8
009f60ef 85db test ebx,ebx
009f5e18 33db xor ebx,ebx
009f5e1a 83c40c add esp,0Ch
009f5e1d 3bc3 cmp eax,ebx
009f5e1f 8986ac000000 mov dword ptr <Unloaded_util.dll>+0xab (000000ac)[esi],eax ds:0023:03ddd034=00000000
009f7854 83c404 add esp,4
009f7857 8b86ac000000 mov eax,dword ptr <Unloaded_util.dll>+0xab (000000ac)[esi] ds:0023:03ddd034=0213208c //[esi+0ach]=0213208c 赋值给eax
009f785d 50 push eax //eax压入堆栈
009f785e 8d4c2410 lea ecx,[esp+10h]
009f7862 56 push esi //esi=03ddcf88，[esi]=0x7
009f7863 51 push ecx
009f7864 896c2418 mov dword ptr [esp+18h],ebp
009f7868 e863060000 call AcroRd32_950000!AVAcroALM_IsFeatureEnabled+0x64471 (009f7ed0) //发生溢出的函数
009f786d 83c40c add esp,0Ch
009f7870 85c0 test eax,eax
009f7872 7407 je AcroRd32_950000!AVAcroALM_IsFeatureEnabled+0x63e1c (009f787b)
009f7ed0 83ec2c sub esp,2Ch
009f7ed3 8b442430 mov eax,dword ptr [esp+30h]
009f7ed7 53 push ebx
009f7ed8 8b18 mov ebx,dword ptr [eax]
009f7eda 8b442438 mov eax,dword ptr [esp+38h]
009f7ede 55 push ebp
009f7edf 56 push esi
009f7ee0 8b742444 mov esi,dword ptr [esp+44h]
009f7ee4 0fb70e movzx ecx,word ptr [esi]
009f7ee7 57 push edi
009f7ee8 8b38 mov edi,dword ptr [eax]
009f7eea 8b4604 mov eax,dword ptr [esi+4]
009f7eed 33d2 xor edx,edx
009f7eef 85c0 test eax,eax
009f7ef1 8954242c mov dword ptr [esp+2Ch],edx
009f7ef5 894c241c mov dword ptr [esp+1Ch],ecx
009f7ef9 895c2414 mov dword ptr [esp+14h],ebx
009f7efd 897c2424 mov dword ptr [esp+24h],edi
009f7f01 0f8c03020000 jl AcroRd32_950000!AVAcroALM_IsFeatureEnabled+0x646ab (009f810a) //[不跳转]
009f7f07 83f801 cmp eax,1
009f7f0a 7e3e jle AcroRd32_950000!AVAcroALM_IsFeatureEnabled+0x644eb (009f7f4a) //[不跳转]
009f7f0c 83f802 cmp eax,2
009f7f0f 0f85f5010000 jne AcroRd32_950000!AVAcroALM_IsFeatureEnabled+0x646ab (009f810a) //[不跳转]
009f7f15 8b4608 mov eax,dword ptr [esi+8]
009f7f18 0faf460c imul eax,dword ptr [esi+0Ch]
009f7f1c 89442418 mov dword ptr [esp+18h],eax
009f7f20 8b4610 mov eax,dword ptr [esi+10h]
009f7f23 83f803 cmp eax,3
009f7f26 7e07 jle AcroRd32_950000!AVAcroALM_IsFeatureEnabled+0x644d0 (009f7f2f) //[跳转]
.........
009f7f2f b903000000 mov ecx,offset <Unloaded_util.dll>+0x2 (00000003) //ecx=0x3
009f7f34 2bc8 sub ecx,eax //eax=0x0,ecx=0x3
009f7f36 d3e7 shl edi,cl //edi=7,逻辑左移3次，即edi=0x7*2*2*2=0x38
009f7f38 897c2428 mov dword ptr [esp+28h],edi //edi赋值给[esp+28]
009f7f3c 8b442428 mov eax,dword ptr [esp+28h]
009f7f40 33ff xor edi,edi
009f7f42 85c0 test eax,eax
009f7f44 897c2448 mov dword ptr [esp+48h],edi
009f7f48 7f0e jg AcroRd32_950000!AVAcroALM_IsFeatureEnabled+0x644f9 (009f7f58) //[跳转]
.........
009f7f58 8b5620 mov edx,dword ptr [esi+20h] ds:0023:021320ac=00000000
009f7f5b 2bc7 sub eax,edi
009f7f5d 8d0c10 lea ecx,[eax+edx]
009f7f60 89442440 mov dword ptr [esp+40h],eax
009f7f64 33c0 xor eax,eax
009f7f66 394c2418 cmp dword ptr [esp+18h],ecx //0x4000000e与0x38进行比较
009f7f6a 0f9ec0 setle al
009f7f6d 0fb7c8 movzx ecx,ax
009f7f70 6685c9 test cx,cx
009f7f73 8b442440 mov eax,dword ptr [esp+40h]
009f7f77 894c2438 mov dword ptr [esp+38h],ecx
009f7f7b 740c je AcroRd32_950000!AVAcroALM_IsFeatureEnabled+0x6452a (009f7f89) //[跳转]
..........
009f7f89 89442444 mov dword ptr [esp+44h],eax ss:0023:0012ed40=03ddcf88
009f7f8d 8bc8 mov ecx,eax
009f7f8f 33c0 xor eax,eax
009f7f91 39460c cmp dword ptr [esi+0Ch],eax //0x4000000e与0x38进行比较
009f7f94 89442440 mov dword ptr [esp+40h],eax
009f7f98 0f8e05010000 jle AcroRd32_950000!AVAcroALM_IsFeatureEnabled+0x64644 (009f80a3) //[不跳转]
009f7f9e 8d2c1f lea ebp,[edi+ebx]
009f7fa1 8d1c7b lea ebx,[ebx+edi*2]
009f7fa4 2bd7 sub edx,edi
009f7fa6 896c2420 mov dword ptr [esp+20h],ebp
009f7faa 895c2424 mov dword ptr [esp+24h],ebx
009f7fae 89542430 mov dword ptr [esp+30h],edx
009f7fb2 eb08 jmp AcroRd32_950000!AVAcroALM_IsFeatureEnabled+0x6455d (009f7fbc) //[跳转]
009f7fb4 8b542430 mov edx,dword ptr [esp+30h] //循环开始
009f7fb8 8b442440 mov eax,dword ptr [esp+40h]
009f7fbc 3bc1 cmp eax,ecx //如果v_counter>bits_original_stream则
009f7fbe 0f8ddf000000 jge AcroRd32_950000!AVAcroALM_IsFeatureEnabled+0x64644 (009f80a3) //循环暂停
009f7fc4 8b6e0c mov ebp,dword ptr [esi+0Ch] //0x4000000e赋值给ebp
009f7fc7 03c7 add eax,edi
009f7fc9 03c2 add eax,edx
009f7fcb 99 cdq
009f7fcc f7fd idiv eax,ebp
009f7fce 8d0439 lea eax,[ecx+edi] //edx变成v_counter
009f7fd1 8b4e10 mov ecx,dword ptr [esi+10h]
009f7fd4 83f903 cmp ecx,3
009f7fd7 8d5c9644 lea ebx,[esi+edx*4+44h] //0x80大小缓冲区指针+v_counter*4+44h,赋值给ebx.
009f7fdb 7558 jne AcroRd32_950000!AVAcroALM_IsFeatureEnabled+0x645d6 (009f8035) //[跳转]
..........
009f8035 83f904 cmp ecx,4
009f8038 7522 jne AcroRd32_950000!AVAcroALM_IsFeatureEnabled+0x645fd (009f805c)
009f803a 8b4c241c mov ecx,dword ptr [esp+1Ch]
009f803e 8b542414 mov edx,dword ptr [esp+14h]
009f8042 8d3c42 lea edi,[edx+eax*2]
009f8045 8b03 mov eax,dword ptr [ebx]
009f8047 51 push ecx
009f8048 8b4c2428 mov ecx,dword ptr [esp+28h]
009f804c 8bd5 mov edx,ebp
009f804e e88df76200 call AcroRd32_950000!PDFLTerm+0x23e0d0 (010277e0)
009f8053 8b7c244c mov edi,dword ptr [esp+4Ch]
009f8057 83c404 add esp,4
009f805a eb23 jmp AcroRd32_950000!AVAcroALM_IsFeatureEnabled+0x64620 (009f807f)
009f805c 8b13 mov edx,dword ptr [ebx]
009f805e 52 push edx
009f805f 8b542420 mov edx,dword ptr [esp+20h]
009f8063 d3e0 shl eax,cl
009f8065 52 push edx
009f8066 8b54241c mov edx,dword ptr [esp+1Ch]
................
009f8035 83f904 cmp ecx,4
009f8038 7522 jne AcroRd32_950000!AVAcroALM_IsFeatureEnabled+0x645fd (009f805c) [br=1] //[跳转]
................
009f805c 8b13 mov edx,dword ptr [ebx] ds:0023:021320d0=00000000
009f805e 52 push edx
009f805f 8b542420 mov edx,dword ptr [esp+20h]
009f8063 d3e0 shl eax,cl
009f8065 52 push edx
009f8066 8b54241c mov edx,dword ptr [esp+1Ch]
009f806a d3e5 shl ebp,cl
009f806c 55 push ebp
009f806d 50 push eax
009f806e 8b442450 mov eax,dword ptr [esp+50h]
009f8072 03c7 add eax,edi
009f8074 d3e0 shl eax,cl
009f8076 52 push edx
009f8077 e8d4f76200 call AcroRd32_950000!PDFLTerm+0x23e140 (01027850) //关键函数
009f807c 83c414 add esp,14h
009f807f 8903 mov dword ptr [ebx],eax //函数返回值覆盖了一个DWORD
009f8081 8b442440 mov eax,dword ptr [esp+40h]
009f8085 8344242402 add dword ptr [esp+24h],2
009f808a 8344242001 add dword ptr [esp+20h],1
009f808f 8b4c2444 mov ecx,dword ptr [esp+44h]
009f8093 83c001 add eax,1
009f8096 3b460c cmp eax,dword ptr [esi+0Ch]
009f8099 89442440 mov dword ptr [esp+40h],eax
009f809d 0f8c11ffffff jl AcroRd32_950000!AVAcroALM_IsFeatureEnabled+0x64555 (009f7fb4) //跳转回009f7fb4继续执行。
for(;;) {
if( v_counter > bits_original_stream ) break; //对应：009f7f91
tmp_counter = v_counter % ParamX; //对应：009f7fcc
lpCurrent = lpBuff + tmp_counter * 4 + 0x44; //对应：009f7fd7
iRetVal = mystery_func( *lpCurrent, variables...); //对应：009f804e
*lpCurrent = iRetVal; //对应：009f807f
v_counter++; //对应：009f8093
if( v_counter >= ParamX ) break;
}
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