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
We recommend that you upgrade your krb5 packages.
For the detailed security status of krb5 please refer to its security
tracker page at:
Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/
Mailing list: [email protected]
Debian Security Advisory DSA-4944-1 [email protected]
https://www.debian.org/security/ Salvatore Bonaccorso
July 25, 2021 https://www.debian.org/security/faq