CVE-2021-41119 DoS vulnerabiliity in wire-server json parser
Attackers can cause denial of service on Wire server backends by sending crafted objects that trigger quadratic time parsing due to hash collisions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-41119?
CVE-2021-41119 is a medium-severity denial of service vulnerability in wireapp wire-server, published on 13 Apr 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-400
Which versions are affected by CVE-2021-41119?
It affects 1 product.
Products include Wire Wire-Server.
How do I fix CVE-2021-41119?
No fix has been published for CVE-2021-41119 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-2021-41119 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-41119 exists.
Other vulnerabilities in wireapp wire-server
Sources
Also known as GHSA-phxv-pffh-fq2r, UBUNTU-CVE-2021-41119.