Buffer overflow in PHP - CVE-2013-6420

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Main Vulnerability Database Vulnerabilities #VU16076

Buffer overflow in PHP - CVE-2013-6420

Published: November 27, 2018 / Updated: April 7, 2020


Vulnerability identifier: #VU16076
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2013-6420
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability: Public exploit is available

Vulnerability details

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

The vulnerability exists due to a boundary error when the asn1_time_to_time_t function in ext/openssl/openssl.c in PHP before 5.3.28, 5.4.x before 5.4.23, and 5.5.x before 5.5.7 does not properly parse (1) notBefore and (2) notAfter timestamps in X.509 certificates. A remote attacker can supply specially crafted X.509 certificates, trigger memory corruption and cause the service to crash or execute arbitrary code on the target system.

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


Affected software

PHP
Gentoo Linux
Amazon Linux AMI
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Scientific Computing
SUSE Linux
Slackware Linux
php5 (Ubuntu package)
php (Alpine package)
dev-lang/php

How to mitigate CVE-2013-6420

Install updates from vendor's website.

PHP - addressed in versions 5.3.28, 5.4.23, 5.5.7
php5 (Ubuntu package) - addressed in versions 5.3.2-1ubuntu4.22, 5.3.10-1ubuntu3.9
php (Alpine package) - update to 5.3.28-r0
dev-lang/php - update to 5.5.16

Links to Public Exploits and PoC-codes

External References

Related Security Bulletins