SB2016011911 - Stack-based buffer overflow in PHP

Description

This security bulletin contains information about 1 security vulnerability.

1) Stack-based buffer overflow (CVE-ID: CVE-2015-5590)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error within the phar_fix_filepath function in ext/phar/phar.c when processing a large length value, as demonstrated by mishandling of an e-mail attachment by the imap PHP extension. A remote unauthenticated attacker can trigger stack-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Remediation

Install update from vendor's website.

References

• http://git.php.net/?p=php-src.git;a=commit;h=6dedeb40db13971af45276f80b5375030aa7e76f
• http://openwall.com/lists/oss-security/2015/07/18/1
• http://www.debian.org/security/2015/dsa-3344
• http://www.php.net/ChangeLog-5.php
• http://www.securityfocus.com/bid/75970
• https://bugs.php.net/bug.php?id=69923