#VU9867 Improper restriction of XML external entity reference (XXE) in PHP - CVE-2015-8866

Vulnerability identifier: #VU9867

Vulnerability risk: Medium

CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:N/SA:N/E:U/U:Green

CVE-ID: CVE-2015-8866

CWE-ID: CWE-611

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerable software:
PHP

Software vendor:
PHP Group

The vulnerability allows a remote attacker to perform XXE. attcks.

The vulnerability exists in ext/libxml/libxml.c when using PHP-FPM due to improper isolation of each threat from libxml_disable_entity_loader changes in other threads. A remote attacker can perform XML External Entity (XXE) and XML Entity Expansion (XEE) attacks via a crafted XML document.

Note: this vulnerability is known at least since 2013 and it was patched several times.

Update to version 7.0.27.

• http://www.openwall.com/lists/oss-security/2016/04/24/1
• http://git.php.net/?p=php-src.git;a=commit;h=de31324c221c1791b26350ba106cc26bad23ace9
• http://www.php.net/ChangeLog-5.php
• https://bugs.php.net/bug.php?id=64938