Test ID:	1.3.6.1.4.1.25623.1.0.892648
Category:	Debian Local Security Checks
Title:	Debian LTS: Security Advisory for mediawiki (DLA-2648-1)
Summary:	The remote host is missing an update for the 'mediawiki'; package(s) announced via the DLA-2648-1 advisory.
Description:	Summary: The remote host is missing an update for the 'mediawiki' package(s) announced via the DLA-2648-1 advisory. Vulnerability Insight: Several vulnerabilities were discovered in mediawiki, a wiki website engine for collaborative work. CVE-2021-20270 An infinite loop in SMLLexer in Pygments used by mediawiki as one if its lexers may lead to denial of service when performing syntax highlighting of a Standard ML (SML) source file, as demonstrated by input that only contains the 'exception' keyword. CVE-2021-27291 pygments, the lexers used by mediawiki rely heavily on regular expressions. Some of the regular expressions have exponential or cubic worst-case complexity and are vulnerable to ReDoS. By crafting malicious input, an attacker can cause a denial of service. CVE-2021-30152 An issue was discovered in MediaWiki. When using the MediaWiki API to 'protect' a page, a user is currently able to protect to a higher level than they currently have permissions for. CVE-2021-30155 An issue was discovered in MediaWiki before. ContentModelChange does not check if a user has correct permissions to create and set the content model of a nonexistent page. CVE-2021-30158 An issue was discovered in MediaWiki. Blocked users are unable to use Special:ResetTokens. This has security relevance because a blocked user might have accidentally shared a token, or might know that a token has been compromised, and yet is not able to block any potential future use of the token by an unauthorized party. CVE-2021-30159 An issue was discovered in MediaWiki. Users can bypass intended restrictions on deleting pages in certain 'fast double move' situations. MovePage::isValidMoveTarget() uses FOR UPDATE, but it's only called if Title::getArticleID() returns non-zero with no special flags. Next, MovePage::moveToInternal() will delete the page if getArticleID(READ_LATEST) is non-zero. Therefore, if the page is missing in the replica DB, isValidMove() will return true, and then moveToInternal() will unconditionally delete the page if it can be found in the master. Affected Software/OS: 'mediawiki' package(s) on Debian Linux. Solution: For Debian 9 stretch, these problems have been fixed in version 1:1.27.7-1~ deb9u8. We recommend that you upgrade your mediawiki packages. CVSS Score: 5.0 CVSS Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P
Cross-Ref:	Common Vulnerability Exposure (CVE) ID: CVE-2021-20270 Common Vulnerability Exposure (CVE) ID: CVE-2021-27291 Common Vulnerability Exposure (CVE) ID: CVE-2021-30152 Common Vulnerability Exposure (CVE) ID: CVE-2021-30155 Common Vulnerability Exposure (CVE) ID: CVE-2021-30158 Common Vulnerability Exposure (CVE) ID: CVE-2021-30159
Copyright	Copyright (C) 2021 Greenbone Networks GmbH

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