Debian Security Advisory

DSA-4944-1 krb5 -- security update

Date Reported:
25 Jul 2021
Affected Packages:
Security database references:
In the Debian bugtracking system: Bug 991365.
In Mitre's CVE dictionary: CVE-2021-36222.
More information:

It was discovered that the Key Distribution Center (KDC) in krb5, the MIT implementation of Kerberos, is prone to a NULL pointer dereference flaw. An unauthenticated attacker can take advantage of this flaw to cause a denial of service (KDC crash) by sending a request containing a PA-ENCRYPTED-CHALLENGE padata element without using FAST.

For the stable distribution (buster), this problem has been fixed in version 1.17-3+deb10u2.

We recommend that you upgrade your krb5 packages.

For the detailed security status of krb5 please refer to its security tracker page at: