A krb5 security update has been released for Debian GNU/Linux 9 LTS to address a denial of service vulnerability in the MIT Kerberos network authentication system.

DLA 2437-1: krb5 security update

- -------------------------------------------------------------------------
Debian LTS Advisory DLA-2437-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Chris Lamb
November 07, 2020   https://wiki.debian.org/LTS
- -------------------------------------------------------------------------

Package : krb5
Version : 1.15-1+deb9u2
CVE ID : CVE-2020-28196
Debian Bug : #973880

It was discovered that there was a denial of service vulnerability in
the MIT Kerberos network authentication system, krb5. The lack of a
limit in the ASN.1 decoder could lead to infinite recursion and allow
an attacker to overrun the stack and cause the process to crash.

For Debian 9 "Stretch", this problem has been fixed in version
1.15-1+deb9u2.

We recommend that you upgrade your krb5 packages.

For the detailed security status of krb5 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/krb5

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS