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

Posted on 16 November 2020
Gentoo-announce

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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
security@gentoo.org 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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