CVE-2010-4021 Auth bypass in n/a
Remote authenticated users can impersonate clients by forging KrbFastReq messages, leading to privilege escalation and security bypass in MIT Kerberos.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2010-4021?
CVE-2010-4021 is a low-severity authentication bypass vulnerability in Mit Kerberos 5, published on 2 Dec 2010. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.7 does not properly restrict the use of TGT credentials for armoring TGS requests, which might allow remote authenticated users to impersonate a client by rewriting an inner request, aka a "KrbFastReq forgery issue."
Which versions are affected by CVE-2010-4021?
It affects 1 product.
Products include Mit Kerberos 5.
How do I fix CVE-2010-4021?
Upgrade to a fixed version.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2010-4021 being exploited?
There is no known exploitation of CVE-2010-4021 in the wild and no public exploit code.
Other vulnerabilities in Mit Kerberos 5
Sources
Also known as DEBIAN-CVE-2010-4021, GHSA-w2r7-v523-8fwv.