CVE-2023-2831 Denial of Service while unescaping a Markdown string
An attacker can cause a Denial of Service in Mattermost by sending messages with excessive escaped characters, requiring a patch to fix.
- 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-2023-2831?
CVE-2023-2831 is a medium-severity denial of service vulnerability in Mattermost Mattermost, published on 16 Jun 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Mattermost fails to unescape Markdown strings in a memory-efficient way, allowing an attacker to cause a Denial of Service by sending a message containing a large number of escaped characters.
Weakness: CWE-400
Which versions are affected by CVE-2023-2831?
It affects 1 product.
Products include Mattermost Mattermost.
How do I fix CVE-2023-2831?
No fix has been published for CVE-2023-2831 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-2023-2831 being exploited?
There is no known exploitation of CVE-2023-2831 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-4qcm-px3r-jfr8.