The Special:Contributions page in MediaWiki before 1.22.0 allows remote attackers to determine if an IP is autoblocked via the "Change block" text.

The version of MediaWiki installed is 1.19.x earlier than 1.19.20, 1.22.x earlier than 1.22.12, or 1.23.x earlier than 1.23.5. Therefore, it is affected by the following XSS vulnerabilities :

 - A flaw exists that allows a XSS attack. This flaw exists because the 'includes/OutputPage.php' script does not restrict JavaScript code embedded within CSS content before returning it to users. This may allow an attacker to create a specially crafted request that would execute arbitrary script code in a user's browser session within the trust relationship between their browser and the server. (CVE-2013-7444)
 - A flaw exists because the 'includes/OutputPage.php' script does not restrict JavaScript code embedded within CSS content before returning it to users. This may allow an attacker to create a specially crafted request that would execute arbitrary script code in a user's browser session within the trust relationship between their browser and the server. (CVE-2014-7295)

- (T94116) SECURITY: Compare API watchlist token in     constant time

  - (T97391) SECURITY: Escape error message strings in     thumb.php

  - (T106893) SECURITY: Don't leak autoblocked IP addresses     on Special:DeletedContributions

  - (T102562) Fix InstantCommons parameters to handle the     new HTTPS-only policy of Wikimedia Commons.

  - (T100767) Setting a configuration setting for skin or     extension to false in LocalSettings.php was not working.

  - (T100635) API action=opensearch json output no longer     breaks when $wgDebugToolbar is enabled.

  - (T102522) Using an extension.json or skin.json file     which has a 'manifest_version' property for 1.26     compatability will no longer trigger warnings.

  - (T86156) Running updateSearchIndex.php will not throw an     error as page_restrictions has been added to the locked     table list.

  - Special:Version would throw notices if using SVN due to     an incorrectly named variable. Add an additional check     that an index is defined.

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

- (T94116) SECURITY: Compare API watchlist token in     constant time * (T97391) SECURITY: Escape error message     strings in thumb.php * (T106893) SECURITY: Don't leak     autoblocked IP addresses on Special:DeletedContributions
    * (T102562) Fix InstantCommons parameters to handle the     new HTTPS-only policy of Wikimedia Commons. * (T100767)     Setting a configuration setting for skin or extension to     false in LocalSettings.php was not working. * (T100635)     API action=opensearch json output no longer breaks when     $wgDebugToolbar is enabled. * (T102522) Using an     extension.json or skin.json file which has a     'manifest_version' property for 1.26 compatability will     no longer trigger warnings. * (T86156) Running     updateSearchIndex.php will not throw an error as     page_restrictions has been added to the locked table     list. * Special:Version would throw notices if using SVN     due to an incorrectly named variable. Add an additional     check that an index is defined.

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

MediaWiki reports :

Internal review discovered that Special:DeletedContributions did not properly protect the IP of autoblocked users. This fix makes the functionality of Special:DeletedContributions consistent with Special:Contributions and Special:BlockList.

Internal review discovered that watchlist anti-csrf tokens were not being compared in constant time, which could allow various timing attacks. This could allow an attacker to modify a user's watchlist via csrf

John Menerick reported that MediaWiki's thumb.php failed to sanitize various error messages, resulting in xss.

ID	Name	Product	Family	Severity
9474	MediaWiki < 1.19.20 / 1.22.12 / 1.23.5 Multiple Vulnerabilities	Nessus Network Monitor	CGI	low
92047	Fedora 22 : mediawiki (2015-122a831a05)	Nessus	Fedora Local Security Checks	medium
85698	Fedora 23 : mediawiki-1.25.2-2.fc23 (2015-13920)	Nessus	Fedora Local Security Checks	high
85428	FreeBSD : mediawiki -- multiple vulnerabilities (6241b5df-42a1-11e5-93ad-002590263bf5)	Nessus	FreeBSD Local Security Checks	high

Detections

Analytics

CVE-2013-7444

critical

Tenable Plugins

low

medium

high

high