CVE-2015-6838

MEDIUM

Description

The xsl_ext_function_php function in ext/xsl/xsltprocessor.c in PHP before 5.4.45, 5.5.x before 5.5.29, and 5.6.x before 5.6.13, when libxml2 before 2.9.2 is used, does not consider the possibility of a NULL valuePop return value before proceeding with a free operation after the principal argument loop, which allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via a crafted XML document, a different vulnerability than CVE-2015-6837.

References

http://php.net/ChangeLog-5.php

http://www.debian.org/security/2015/dsa-3358

http://www.securityfocus.com/bid/76733

http://www.securitytracker.com/id/1033548

https://bugs.php.net/bug.php?id=69782

https://security.gentoo.org/glsa/201606-10

Details

Source: MITRE

Published: 2016-05-16

Updated: 2017-11-04

Risk Information

CVSS v2.0

Base Score: 5

Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P)

Impact Score: 2.9

Exploitability Score: 10

Severity: MEDIUM

CVSS v3.0

Base Score: 7.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Impact Score: 3.6

Exploitability Score: 3.9

Severity: HIGH