CVE-2013-6420

Severity: high (CVSS 7.5 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 35.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2013-12-17 · updated 2026-06-17
Weakness: CWE-119

Description

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, which allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted certificate that is not properly handled by the openssl_x509_parse function.

Affected products

macOS: through 10.9.1
Opensuse: 11.4, 12.2, 12.3, 13.1
PHP: through 5.3.27; 5.4.0, 5.4.1, 5.4.2, 5.4.3, 5.4.4, 5.4.5 (+69)

References

http://forums.interworx.com/threads/8000-InterWorx-Version-5-0-14-Released-on-Beta-Channel%21
http://git.php.net/?p=php-src.git%3Ba=commit%3Bh=c1224573c773b6845e83505f717fbf820fc18415
http://lists.opensuse.org/opensuse-updates/2013-12/msg00125.html
http://lists.opensuse.org/opensuse-updates/2013-12/msg00126.html
http://rhn.redhat.com/errata/RHSA-2013-1813.html
http://rhn.redhat.com/errata/RHSA-2013-1815.html
http://rhn.redhat.com/errata/RHSA-2013-1824.html
http://rhn.redhat.com/errata/RHSA-2013-1825.html
http://rhn.redhat.com/errata/RHSA-2013-1826.html
http://secunia.com/advisories/59652
http://support.apple.com/kb/HT6150
http://www.debian.org/security/2013/dsa-2816

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