Heap-based buffer overflow in PHP - CVE-2007-4661

Vulnerability details

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error within the chunk_split function in string.c in PHP 5.2.3 does not properly calculate the needed buffer size due to precision loss when performing integer arithmetic with floating point numbers, which. A remote attacker can trigger a heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Affected software

How to mitigate CVE-2007-4661

External References

• http://cvs.php.net/viewvc.cgi/php-src/ext/standard/string.c?r1=1.445.2.14.2.58&r2=1.445.2.14.2.59
• http://lists.opensuse.org/opensuse-security-announce/2008-01/msg00006.html
• http://secunia.com/advisories/26642
• http://secunia.com/advisories/26838
• http://secunia.com/advisories/27102
• http://secunia.com/advisories/27864
• http://secunia.com/advisories/28658
• http://www.gentoo.org/security/en/glsa/glsa-200710-02.xml
• http://www.php.net/ChangeLog-5.php#5.2.4
• http://www.php.net/releases/5_2_4.php
• http://www.ubuntu.com/usn/usn-549-2
• https://issues.rpath.com/browse/RPL-1702
• https://launchpad.net/bugs/173043
• https://usn.ubuntu.com/549-1/

Related Security Bulletins

• Multiple vulnerabilities in PHP