CVE-2021-41119
Releases prior to v2022-03-01 are subject to a denial of service attack via a crafted object causing a hash collision.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.36%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Wire-server is the system server for the wire back-end services. Releases prior to v2022-03-01 are subject to a denial of service attack via a crafted object causing a hash collision. This collision causes the server to spend at least quadratic time parsing it which can lead to a denial of service for a heavily used server. The issue has been fixed in wire-server 2022-03-01 and is already deployed on all Wire managed services. On premise instances of wire-server need to be updated to 2022-03-01, so that their backends are no longer affected. There are no known workarounds for this issue.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 1.36% probability · 70th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-400
- Affected
- wire/wire-server
- Source
- security-advisories@github.com
References
- https://cs-syd.eu/posts/2021-09-11-json-vulnerabilityExploit, Third Party Advisory
- https://github.com/wireapp/wire-server/security/advisories/GHSA-phxv-pffh-fq2rThird Party Advisory
- https://cs-syd.eu/posts/2021-09-11-json-vulnerabilityExploit, Third Party Advisory
- https://github.com/wireapp/wire-server/security/advisories/GHSA-phxv-pffh-fq2rThird Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.