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Vigil@nce - PHP: memory corruption via phar_tar_process_metadata

July 2015 by Vigil@nce

This bulletin was written by Vigil@nce : http://vigilance.fr/offer

SYNTHESIS OF THE VULNERABILITY

An attacker can generate a memory corruption in the
phar_tar_process_metadata() function of PHP, in order to trigger a
denial of service, and possibly to execute code.

Impacted products: PHP, RHEL

Severity: 2/4

Creation date: 18/05/2015

DESCRIPTION OF THE VULNERABILITY

The PHP product uses the Phar extension to manipulate PHP archives.

However, a malformed archive misaligns a memory address of 4 bytes
in the phar_tar_process_metadata() function.

An attacker can therefore generate a memory corruption in the
phar_tar_process_metadata() function of PHP, in order to trigger a
denial of service, and possibly to execute code.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/PHP-memory-corruption-via-phar-tar-process-metadata-16914


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