Debian LTS: Security Advisory for mediawiki (DLA-2648-1)

Published: 2021-05-06 03:01:47
CVE Author: NIST National Vulnerability Database

CVSS Base Vector:
AV:N/AC:L/Au:N/C:N/I:N/A:P

Summary:
The remote host is missing an update for the 'mediawiki' Linux Distribution Package(s) announced via the DLA-2648-1 advisory.

Detection Method:
Checks if a vulnerable Linux Distribution Package version is present on the target host.

Technical Details:
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 Versions:
'mediawiki' Linux Distribution Package(s) on Debian Linux.

Recommendations:
For Debian 9 stretch, these problems have been fixed in version 1:1.27.7-1~deb9u8. We recommend that you upgrade your mediawiki Linux Distribution Packages.

Solution Type:
Vendor Patch

Detection Type:
Linux Distribution Package

NIST (National Institute of Standards and Technology) NVD (National Vulnerability Database)

https://nvd.nist.gov/vuln/detail/CVE-2021-20270
https://nvd.nist.gov/vuln/detail/CVE-2021-27291
https://nvd.nist.gov/vuln/detail/CVE-2021-30152
https://nvd.nist.gov/vuln/detail/CVE-2021-30155
https://nvd.nist.gov/vuln/detail/CVE-2021-30158
https://nvd.nist.gov/vuln/detail/CVE-2021-30159

References:

https://lists.debian.org/debian-lts-announce/2021/05/msg00003.html
https://security-tracker.debian.org/tracker/DLA-2648-1

https://bugs.debian.org/985574
https://bugs.debian.org/984664

Severity
Medium
CVSS Score
5.0
Published
2021-05-06
Modified
2021-05-06
Category
Debian Local Security Checks

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