The Quiz extension for MediaWiki allows remote attackers to cause a denial of service via regex metacharacters in a regular expression.

The remote host is affected by the vulnerability described in GLSA-201510-05 (MediaWiki: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in MediaWiki. Please       review the CVE identifiers referenced below for details.
  Impact :

    A remote attacker may be able to create a Denial of Service condition,       obtain sensitive information, bypass security restrictions, and inject       arbitrary web script or HTML.
  Workaround :

    There is no known workaround at this time.

- (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
86690	GLSA-201510-05 : MediaWiki: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	high
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-2015-6736

high

Tenable Plugins

high

high

high