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CVE-2015-8623

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Date: March 23, 2017

The User::matchEditToken function in includes/User.php in MediaWiki before 1.23.12 and 1.24.x before 1.24.5 does not perform token comparison in constant time before returning, which allows remote attackers to guess the edit token and bypass CSRF protection via a timing attack, a different vulnerability than CVE-2015-8624.

Language: PHP

Severity Score

Related Resources (8)

https://gerrit.wikimedia.org/r/#/c/156336/5/includes/User.php
https://nvd.nist.gov/vuln/detail/CVE-2015-8623
https://security-tracker.debian.org/tracker/CVE-2015-8623
https://lists.wikimedia.org/pipermail/mediawiki-announce/2015-December/000186.html
http://www.openwall.com/lists/oss-security/2015/12/21/8
http://www.openwall.com/lists/oss-security/2015/12/23/7
https://phabricator.wikimedia.org/T119309
https://www.mend.io/vulnerability-database/CVE-2015-8623

Severity Score

Weakness Type (CWE)

Cross-Site Request Forgery (CSRF)

CWE-352

Top Fix

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Upgrade to version 1.23.12,1.24.5,1.25.4,1.26.1

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): REQUIRED
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): PARTIAL
Integrity (I): PARTIAL
Availability (A): PARTIAL
Additional information:

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