CVE-2022-3257: Unrestricted Upload of File with Dangerous Type

September 25, 2022 (updated March 27, 2023)

Mattermost version 7.1.x 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.

References

github.com/advisories/GHSA-m7w4-q5vg-5xfp
hackerone.com/reports/1620170
mattermost.com/security-updates/
nvd.nist.gov/vuln/detail/CVE-2022-3257

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