CVE-2021-36368 Security feature bypass in n/a
OpenSSH users with agent forwarding may be unable to distinguish between local and remote authentication prompts, potentially allowing unauthorized access.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-36368?
CVE-2021-36368 is a low-severity vulnerability in Debian Debian Linux, published on 12 Mar 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An issue was discovered in OpenSSH before 8.9. If a client is using public-key authentication with agent forwarding but without -oLogLevel=verbose, and an attacker has silently modified the server to support the None authentication option, then the user cannot determine whether FIDO authentication is going to confirm that the user wishes to connect to that server, or that the user wishes to allow that server to connect to a different server on the user's behalf. NOTE: the vendor's position is "this is not an authentication bypass, since nothing is being bypassed.
Weakness: CWE-287
Which versions are affected by CVE-2021-36368?
It affects 2 products.
Products include Debian Debian Linux, OpenSSH.
How do I fix CVE-2021-36368?
Upgrade to a fixed version.
Is CVE-2021-36368 being exploited?
There is no known exploitation of CVE-2021-36368 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as ALPINE-CVE-2021-36368, AZL-9045, DEBIAN-CVE-2021-36368, GHSA-542x-jxrc-hw4x.