CVE-2021-37865 Server-side Denial of Service while processing a specifically crafted GIF file
Authenticated users can cause server-side denial of service by uploading a crafted GIF file, exhausting resources in Mattermost.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-37865?
CVE-2021-37865 is a medium-severity denial of service vulnerability in Mattermost Mattermost, published on 18 Jan 2022. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Mattermost 6.2 and earlier fails to sufficiently process a specifically crafted GIF file when it is uploaded while drafting a post, which allows authenticated users to cause resource exhaustion while processing the file, resulting in server-side Denial of Service.
Weakness: CWE-400
Which versions are affected by CVE-2021-37865?
It affects 1 product.
Products include Mattermost Mattermost.
How do I fix CVE-2021-37865?
No fix has been published for CVE-2021-37865 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-37865 being exploited?
There is no known exploitation of CVE-2021-37865 in the wild and no public exploit code.
Other vulnerabilities in Mattermost Mattermost
- CVE-2019-20851 Path traversal in n/a
- CVE-2024-39274 Malicious remote can add users to arbitrary teams and channels
- CVE-2024-39777 Malicious remote can invite itself to an arbitrary local channel
- CVE-2024-39830 Timing attack during remote cluster token comparison when shared channels are enabled
- CVE-2023-3615 Lack of server certificate validation in websockets connection
Sources
Also known as GHSA-jqq9-5hrp-9jg8.