[ GLSA 202011-17 ] MIT Kerberos 5: Denial of service

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Gentoo Linux Security Advisory                           GLSA 202011-17
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                                           https://security.gentoo.org/
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 Severity: Low
    Title: MIT Kerberos 5: Denial of service
     Date: November 16, 2020
     Bugs: #753281
       ID: 202011-17

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Synopsis
========

A vulnerability in MIT Kerberos 5 could lead to a Denial of Service
condition.

Background
==========

The MIT Kerberos 5 implementation provides a command line telnet client
which is used for remote login via the telnet protocol.

Affected packages
=================

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  app-crypt/mit-krb5         < 1.18.2-r2              >= 1.18.2-r2 

Description
===========

It was discovered that MIT Kerberos network authentication system,
krb5, did not properly handle ASN.1-encoded Kerberos messages.

Impact
======

A remote attacker could send a specially crafted Kerberos message,
possibly resulting in a Denial of Service condition.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All MIT Kerberos 5 users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=app-crypt/mit-krb5-1.18.2-r2"

References
==========

[ 1 ] CVE-2020-28196
      https://nvd.nist.gov/vuln/detail/CVE-2020-28196

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

 https://security.gentoo.org/glsa/202011-17

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users' machines is of utmost
importance to us. Any security concerns should be addressed to
[email protected] or alternatively, you may file a bug at
https://bugs.gentoo.org.

License
=======

Copyright 2020 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

https://creativecommons.org/licenses/by-sa/2.5

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