Gentoo Logo

mit-krb5: Multiple buffer overflows in telnet client

Content:

1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200504-04 / telnet
Release Date April 06, 2005
Latest Revision April 06, 2005: 01
Impact normal
Exploitable remote
Package Vulnerable versions Unaffected versions Architecture(s)
app-crypt/mit-krb5 < 1.3.6-r2 >= 1.3.6-r2 All supported architectures

Related bugreports: #87145

Synopsis

The mit-krb5 telnet client is vulnerable to two buffer overflows, which could allow a malicious telnet server operator to execute arbitrary code.

2.  Impact Information

Background

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

Description

A buffer overflow has been identified in the env_opt_add() function, where a response requiring excessive escaping can cause a heap-based buffer overflow. Another issue has been identified in the slc_add_reply() function, where a large number of SLC commands can overflow a fixed size buffer.

Impact

Successful exploitation would require a vulnerable user to connect to an attacker-controlled telnet host, potentially executing arbitrary code with the permissions of the telnet user on the client.

3.  Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All mit-krb5 users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=app-crypt/mit-krb5-1.3.6-r2"

4.  References



Print

Page updated April 06, 2005

Summary: This is a Gentoo Linux Security Advisory

Security Team
Contact Address

Donate to support our development efforts.

Copyright 2001-2014 Gentoo Foundation, Inc. Questions, Comments? Contact us.