[ GLSA 200504-04 ] mit-krb5: Multiple buffer overflows in telnet client

[GLSA]

Gentoo Linux Security Advisory

Title: mit-krb5: Multiple buffer overflows in telnet client (GLSA 200504-04)
Severity: normal
Exploitable: remote
Date: April 06, 2005
Bug(s): #87145
ID: 200504-04

Synopsis

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

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: app-crypt/mit-krb5
Vulnerable: < 1.3.6-r2
Unaffected: >= 1.3.6-r2
Architectures: All supported architectures


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.

Workaround

There is no known workaround at this time.

Resolution

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