GHSA-33xw-x3pr-rvqj CVE-2019-12473
Wikimedia Potential DOS due to slow WatchedItemStore::countVisitingWatchersMultiple
High
Packagist
- Severity
- 7.5 / 10
- High · CVSS 3.0
- Exploit chance (EPSS)
- 2.31%
- Chance of exploitation in the next 30 days. Higher than 83.38% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-400 Uncontrolled Resource Consumption
- Fix
1.27.6- Upgrade mediawiki/core to this version or later
Description
Wikimedia MediaWiki 1.27.0 through 1.32.1 might allow DoS. Passing invalid titles to the API could cause a DoS by querying the entire watchlist table. Fixed in 1.32.2, 1.31.2, 1.30.2 and 1.27.6.
Affected versions
Packagist
| Package | Vulnerable | Fixed in |
|---|---|---|
| mediawiki/core | >= 1.27.0, < 1.27.6 |
1.27.6 |
| mediawiki/core | >= 1.30.0, < 1.30.2 |
1.30.2 |
| mediawiki/core | >= 1.31.0, < 1.31.2 |
1.31.2 |
| mediawiki/core | >= 1.32.0, < 1.32.2 |
1.32.2 |
How to fix
Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.
mediawiki/core Packagist → 1.27.6
- composer
composer require mediawiki/core:^1.27.6
Severity breakdown
CVSS 3.0 7.5
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Weakness
CWE-400: Uncontrolled Resource Consumption
The product does not properly control the allocation and maintenance of a limited resource.
How to prevent it
- Architecture and Design: Design throttling mechanisms into the system architecture. The best protection is to limit the amount of resources that an unauthorized user can cause to be expended. A strong authentication and access control model will help prevent such attacks from occurring in the first place. The login application should be protected against DoS attacks as much as possible. Limiting the database access, perhaps by caching result sets, can help minimize the resources expended. To further limit the potential for a DoS attack, consider tracking the rate of requests received from users and blocking requests that exceed a defined rate threshold.
- Architecture and Design: Mitigation of resource exhaustion attacks requires that the target system either: recognizes the attack and denies that user further access for a given amount of time, or uniformly throttles all requests in order to make it more difficult to consume resources more quickly than they can again be freed. The first of these solutions is an issue in itself though, since it may allow attackers to prevent the use of the system by a particular valid user. If the attacker impersonates the valid user, they may be able to prevent the user from accessing the server in question. The second solution is simply difficult to effectively institute -- and even when properly done, it does not provide a full solution. It simply makes the attack require more resources on the part of the attacker.
- Architecture and Design: Ensure that protocols have specific limits of scale placed on them.
- Implementation: Ensure that all failures in resource allocation place the system into a safe posture.
References
Advisories
Packages
Other links
Timeline
- Published
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GHSA-w5fx-cx7f-6vr9 MediaWiki Denial of Service vulnerability | High | Also affects mediawiki/core |
| GHSA-5vj8-g3qg-4qh6 X-Forwarded-For header allows brute-forcing autoblocked IP addresses | Critical | Also affects mediawiki/core |
| GHSA-c8wv-qwwc-6j73 MediaWiki allows a denial of service | Medium | Also affects mediawiki/core |
| GHSA-rqvj-fc2x-99q6 OATHAuth extension in MediaWiki is not implementing rate limit | High | Also affects mediawiki/core |
| GHSA-c4rj-wrmq-52rj MediaWiki Special:UserRights exposes the existence of hidden users | Medium | Also affects mediawiki/core |
| GHSA-h8qx-mj6v-2934 MediaWiki Cross-site Scripting (XSS) vulnerability | Medium | Also affects mediawiki/core |
| GHSA-4vr7-m8p8-434h MediaWiki Cross-site Scripting (XSS) vulnerability | Medium | Also affects mediawiki/core |
| GHSA-2f58-vf6g-6p8x MediaWiki Cross-site Scripting (XSS) vulnerability | Medium | Also affects mediawiki/core |
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