Heap-based buffer overflow in PHP - CVE-2016-4344

Detailed vulnerability description

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

The vulnerability exists due to a boundary error in Integer overflow in the xml_utf8_encode function in ext/xml/xml.c in PHP before 7.0.4. A remote attacker can use a long argument to the utf8_encode function to trigger a heap-based buffer overflow and execute arbitrary code on the target system.

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

How to mitigate CVE-2016-4344

Sources

• http://php.net/ChangeLog-7.php
• http://www.openwall.com/lists/oss-security/2016/04/28/2
• https://bugs.php.net/bug.php?id=71637