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PHP openssl_x509_parse() Memory Corruption

Posted Dec 15, 2013

Authored by Stefan Esser

The PHP function openssl_x509_parse() uses a helper function called asn1_time_to_time_t() to convert timestamps from ASN1 string format into integer timestamp values. The parser within this helper function is not binary safe and can therefore be tricked to write up to five NUL bytes outside of an allocated buffer. This problem can be triggered by x509 certificates that contain NUL bytes in their notBefore and notAfter timestamp fields and leads to a memory corruption that might result in arbitrary code execution.

tags | exploit, arbitrary, php, code execution

advisories | CVE-2013-6420

SHA-256 | 7406038cb1adf87acf1e03364bbd761251c6d8fc531065990b85c245ae25fbe4

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