mediawiki: multiple issues

• 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
JavaScript.

• 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.