CVE-2013-6420 EXPLOIT
7.5
HIGH · CVSS 2.0 · EPSS 35.6% (pctl 98)
Patch early
A public exploit exists.
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.
Scoring
| CVSS | 7.5 (HIGH, v2.0) |
|---|---|
| Vector | AV:N/AC:L/Au:N/C:P/I:P/A:P |
| EPSS | 35.64% — more likely to be exploited than 98% of all CVEs |
| Weakness | CWE-119 |
| On CISA KEV | no |
| Public exploit | yes |
| Published | 2013-12-17 |
| Last modified | 2026-06-17 |
Affected (3)
| Vendor | Product |
|---|---|
| apple | mac os x |
| opensuse | opensuse |
| php | php |
Public exploits
| Source | Title | Date |
|---|---|---|
| exploit-db | PHP - 'openssl_x509_parse()' Memory Corruption | 2013-12-17 |
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
- http://www.php.net/ChangeLog-5.php
- http://www.securityfocus.com/bid/64225
- http://www.securitytracker.com/id/1029472
- http://www.ubuntu.com/usn/USN-2055-1
- https://bugzilla.redhat.com/show_bug.cgi?id=1036830
- https://h20564.www2.hp.com/hpsc/doc/public/display?docId=emr_na-c04463322
- https://www.sektioneins.de/advisories/advisory-012013-php-openssl_x509_parse-memory-corruption-vulnerability.html
- http://forums.interworx.com/threads/8000-InterWorx-Version-5-0-14-Released-on-Beta-Channel%21
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