MediaWiki 1.18.4/1.19.1 User Block Attempt information disclosure

CVSS Meta Temp Score
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CTI Interest Score
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4.1$0-$5k0.00

A vulnerability was found in MediaWiki 1.18.4/1.19.1 (Content Management System). It has been rated as problematic. This issue affects an unknown code of the component User Block Attempt Handler. The manipulation with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. The summary by CVE is:

MediaWiki before 1.18.5, and 1.19.x before 1.19.2 does not properly protect user block metadata, which allows remote administrators to read a user block reason via a reblock attempt.

The weakness was released 08/31/2012 by Tim Starling (Fomafix) with MediaWiki as Bug 39823 as not defined posting (Bugzilla). The advisory is shared at bugzilla.wikimedia.org. The public release was coordinated with the project team. The identification of this vulnerability is CVE-2012-4382 since 08/21/2012. The exploitation is known to be easy. The attack may be initiated remotely. A simple authentication is needed for exploitation. Technical details are unknown but a public exploit is available. MITRE ATT&CK project uses the attack technique T1592 for this issue. During internal review, it was discovered that metadata about blocks, hidden by a user with suppression rights, was visible to administrators.

A public exploit has been developed by Tim Starling and been published immediately after the advisory. The exploit is available at bugzilla.wikimedia.org. It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 61765 (FreeBSD : mediawiki -- multiple vulnerabilities (7c0fecd6-f42f-11e1-b17b-000c2977ec30)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD Local Security Checks.

Upgrading to version 1.18.5 or 1.19.2 eliminates this vulnerability. The upgrade is hosted for download at download.wikimedia.org. Applying the patch Patch for 1.18 branch 11042 is able to eliminate this problem. The bugfix is ready for download at bugzilla.wikimedia.org. The best possible mitigation is suggested to be upgrading to the latest version. A possible mitigation has been published immediately after the disclosure of the vulnerability. Administrators are advised to avoid placing private data in block reasons. If a block reason does contain private data, the user should be reblocked with a non-private block reason and the original log entry suppressed.

The vulnerability is also documented in the vulnerability database at Tenable (61765). openwall.com is providing further details. Entries connected to this vulnerability are available at 6086, 6088, 6097 and 6098.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

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CVSSv3info

VulDB Meta Base Score: 4.6
VulDB Meta Temp Score: 4.4

VulDB Base Score: 4.3
VulDB Temp Score: 3.9
VulDB Vector: 🔍
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NVD Base Score: 4.9
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CVSSv2info

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Exploitinginfo

Class: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
ATT&CK: T1592

Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: Tim Starling
Download: 🔍

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Nessus ID: 61765
Nessus Name: FreeBSD : mediawiki -- multiple vulnerabilities (7c0fecd6-f42f-11e1-b17b-000c2977ec30)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

OpenVAS ID: 71871
OpenVAS Name: FreeBSD Ports: mediawiki
OpenVAS File: 🔍
OpenVAS Family: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
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Exploit Delay Time: 🔍

Upgrade: MediaWiki 1.18.5/1.19.2
Patch: Patch for 1.18 branch 11042

Timelineinfo

08/21/2012 🔍
08/31/2012 +10 days 🔍
08/31/2012 +0 days 🔍
08/31/2012 +0 days 🔍
08/31/2012 +0 days 🔍
08/31/2012 +0 days 🔍
08/31/2012 +0 days 🔍
08/31/2012 +0 days 🔍
09/01/2012 +0 days 🔍
09/09/2012 +8 days 🔍
10/03/2012 +24 days 🔍
10/19/2017 +1842 days 🔍
04/12/2021 +1271 days 🔍

Sourcesinfo

Product: mediawiki.org

Advisory: Bug 39823
Researcher: Tim Starling (Fomafix)
Organization: MediaWiki
Status: Not defined
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2012-4382 (🔍)
Vulnerability Center: 36331 - MediaWiki <1.18.5 and <1.19.2 Users Blocking Information Disclosure Vulnerability, Medium
SecurityFocus: 55370 - MediaWiki Multiple Remote Vulnerabilities
Secunia: 50477 - MediaWiki Multiple Vulnerabilities, Moderately Critical
OSVDB: 85107

scip Labs: https://www.scip.ch/en/?labs.20161013
Misc.: 🔍
See also: 🔍

Entryinfo

Created: 09/09/2012 19:01
Updated: 04/12/2021 07:42
Changes: 09/09/2012 19:01 (90), 04/17/2017 11:46 (5), 04/12/2021 07:37 (13), 04/12/2021 07:42 (1)
Complete: 🔍

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