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PHP 5.4.x < 5.4.43 / 5.5.x < 5.5.27 / 5.6.x < 5.6.11 Multiple Vulnerabilities (BACKRONYM)

Critical

Synopsis

The remote web server uses a version of PHP that is affected by multiple vulnerabilities.

Description

Versions of PHP 5.4.x earlier than 5.4.43, 5.5.x earlier than 5.5.27, or 5.6.x earlier than 5.6.11 are subject to the following issues :

- A flaw exists in the phar_convert_to_other() function in 'ext/phar/phar_object.c' that is triggered during the conversion of invalid TAR files. This may allow a remote attacker to crash an application utilizing PHP. (CVE-2015-5589) - The '!' character is not treated as a special character when delayed variable substitution is enabled. The functions escapeshellcmd() and escapeshellarg() are unable to properly sanitize arguments containing '!'. An attacker can exploit this to execute arbitrary commands. (OSVDB 124412) - A flaw exists in the phar_fix_filepath() function, allowing a buffer overflow that could causes a crash or execution of arbitrary code. (OSVDB 124242)

Solution

Upgrade to PHP version 5.6.11 or later. If 5.6.11 cannot be installed, 5.4.43 and 5.5.27 are also patched for these vulnerabilities.