Arch Linux Security Advisory ASA-201704-3
=========================================

Severity: High
Date    : 2017-04-07
CVE-ID  : CVE-2017-0361 CVE-2017-0362 CVE-2017-0363 CVE-2017-0364
          CVE-2017-0365 CVE-2017-0366 CVE-2017-0367 CVE-2017-0368
          CVE-2017-0369 CVE-2017-0370 CVE-2017-0372
Package : mediawiki
Type    : multiple issues
Remote  : Yes
Link    : https://security.archlinux.org/AVG-236

Summary
=======

The package mediawiki before version 1.28.1-1 is vulnerable to multiple
issues including arbitrary code execution, cross-site scripting,
information disclosure, cross-site request forgery, insufficient
validation, open redirect and access restriction bypass.

Resolution
==========

Upgrade to 1.28.1-1.

# pacman -Syu "mediawiki>=1.28.1-1"

The problems have been fixed upstream in version 1.28.1.

Workaround
==========

None.

Description
===========

- CVE-2017-0361 (information disclosure)

MediaWiki before 1.28.1 may leak passwords in plaintext. API parameters
may now be marked as "sensitive" to keep their values out of the logs.

- CVE-2017-0362 (cross-site request forgery)

MediaWiki before 1.18.1 did not require a CSRF token for the "Mark all
pages visited" action on the watchlist.

- CVE-2017-0363 (open redirect)

The Special:UserLogin page in MediaWiki < 1.28.1 has an open redirect
issue.

- CVE-2017-0364 (open redirect)

The Special:Search page in MediaWiki < 1.28.1 has an open redirect
issue.

- CVE-2017-0365 (cross-site scripting)

SearchHighlighter::removeWiki() uses a regex to remove html from
snippets. The regex - /<\/?[^>]+>/ assumes that html is well-formed. As
a result when using SearchHighlighter::highlightText() as the
highlighting method, this can result in an XSS when
$wgAdvancedSearchHighlighting is true.

- CVE-2017-0366 (cross-site scripting)

MediaWiki < 1.28.1 did not properly filter the DTD declaration when a
SVG file was uploaded, leading to a persistent XSS.

- CVE-2017-0367 (arbitrary code execution)

MediaWiki before 1.28.1 uses the default system temporary directory for
the LocalisationCache directory, allowing a local attacker to execute
arbitrary code as the web user by crafting a cache file whose content
will be passe to unserialize().

- CVE-2017-0368 (cross-site scripting)

MediaWiki < 1.28.1 did not properly mark system messages as raw HTML,
hence not properly escaping it.

- CVE-2017-0369 (access restriction bypass)

In MediaWiki < 1.28.1, a normal sysop that doesn't have the necessary
rights to override a page protection can still recreate it by restoring
a former revision of that page.

- CVE-2017-0370 (insufficient validation)

The spam blacklist in MediaWiki before 1.28.1 could be bypassed by
encoding URLs inside a file inclusion syntax's link parameter.

- CVE-2017-0372 (cross-site scripting)

The SyntaxHighlight extension in MediaWiki before 1.28.1 does not
properly validate the 'start' parameter before passing it to Pygments.

Impact
======

A remote attacker might be able to access sensitive information, trick
users into visiting a malicious website, execute arbitrary JavaScript
on the visitor's browser, trick users into performing unwanted actions
and bypass access restrictions. A local attacker might be able to
execute arbitrary code with the privileges of the webserver.

References
==========

https://lists.wikimedia.org/pipermail/mediawiki-announce/2017-April/000207.html
https://phabricator.wikimedia.org/T125177
https://phabricator.wikimedia.org/T150044
https://phabricator.wikimedia.org/T109140
https://phabricator.wikimedia.org/T122209
https://phabricator.wikimedia.org/T144845
https://phabricator.wikimedia.org/T151735
https://phabricator.wikimedia.org/T161453
https://phabricator.wikimedia.org/T156184
https://phabricator.wikimedia.org/T108138
https://phabricator.wikimedia.org/T48143
https://phabricator.wikimedia.org/T158689
https://security.archlinux.org/CVE-2017-0361
https://security.archlinux.org/CVE-2017-0362
https://security.archlinux.org/CVE-2017-0363
https://security.archlinux.org/CVE-2017-0364
https://security.archlinux.org/CVE-2017-0365
https://security.archlinux.org/CVE-2017-0366
https://security.archlinux.org/CVE-2017-0367
https://security.archlinux.org/CVE-2017-0368
https://security.archlinux.org/CVE-2017-0369
https://security.archlinux.org/CVE-2017-0370
https://security.archlinux.org/CVE-2017-0372