[arch-security] [ASA-201504-11] mediawiki: multiple issues

Levente Polyak anthraxx at archlinux.org
Thu Apr 9 23:18:29 UTC 2015

Arch Linux Security Advisory ASA-201504-11

Severity: Medium
Date    : 2015-04-10
CVE-ID  : CVE-2015-2931 CVE-2015-2932 CVE-2015-2933 CVE-2015-2934
          CVE-2015-2935 CVE-2015-2936 CVE-2015-2937 CVE-2015-2938
          CVE-2015-2939 CVE-2015-2940 CVE-2015-2941 CVE-2015-2942
Package : mediawiki
Type    : multiple issues
Remote  : Yes
Link    : https://wiki.archlinux.org/index.php/CVE


The package mediawiki before version 1.24.2-1 is vulnerable to multiple
issues including but not limited to cross-side scripting, external
resource loading, cross-side request forgery and denial of service.


Upgrade to 1.24.2-1.

# pacman -Syu "mediawiki>=1.24.2-1"

The problems have been fixed upstream in version 1.24.2.




- CVE-2015-2931 (cross-side scripting)

It was discovered that MIME types were not properly restricted, allowing
a way to circumvent the SVG MIME blacklist for embedded resources. This
allowed an attacker to embed JavaScript in a SVG file.

- CVE-2015-2932 (cross-side scripting)

The SVG filter to prevent injecting JavaScript using animate elements
was incorrect. The list of dangerous parts of HTML5 is supposed to
include all uses of 'animate attributename="xlink:href"' in SVG documents.

- CVE-2015-2933 (cross-side scripting)

A persistent XSS vulnerability was discovered due to the way attributes
were expanded in MediaWiki's HTML class, in combination with
LanguageConverter substitutions.

- CVE-2015-2934 (cross-side scripting)

It was discovered that MediaWiki's SVG filtering could be bypassed with
entity encoding under the Zend interpreter. This could be used to inject

- CVE-2015-2935 (external resource loading)

A way was discovered to bypass the style filtering for SVG files to load
external resource. This could violate the anonymity of users viewing the
SVG. This issue exists because of an incomplete fix for CVE-2014-7199.

- CVE-2015-2936 (denial of service)

It was discovered that MediaWiki versions using PBKDF2 for password
hashing (the default since 1.24) are vulnerable to DoS attacks using
extremely long passwords.

- CVE-2015-2937 (denial of service)

It was discovered that MediaWiki is vulnerable to "Quadratic Blowup"
denial of service attacks.

- CVE-2015-2938 (cross-side scripting)

It was discovered that the MediaWiki feature allowing a user to preview
another user's custom JavaScript could be abused for privilege
escalation. This feature has been removed.

- CVE-2015-2939 (cross-side scripting)

It was discovered that function names were not sanitized in Lua error
backtraces, which could lead to XSS.

- CVE-2015-2940 (cross-side request forgery)

It was discovered that the CheckUser extension did not prevent CSRF
attacks on the form allowing checkusers to look up sensitive information
about other users. Since the use of CheckUser is logged, the CSRF could
be abused to defame a trusted user or flood the logs with noise.

- CVE-2015-2941 (cross-side scripting)

It was discovered that XSS is possible in the way api errors were
reflected under HHVM versions before 3.6.1. MediaWiki now detects and
mitigates this issue on older versions of HHVM.

- CVE-2015-2942 (denial of service)

It was discovered that MediaWiki's SVG and XMP parsing running under
HHVM was susceptible to "Billion Laughs" DoS attacks.


A remote attacker is able to perform cross-side scripting, external
resource loading, cross-side request forgery and denial of service via
various vectors.



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