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

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

Affected Packages

app-crypt/mit-krb5 on all architectures
Affected versions < 1.3.6-r2
Unaffected versions >= 1.3.6-r2

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.

Workaround

There is no known workaround at this time.

Resolution

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

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

References

Release Date
April 06, 2005

Latest Revision
April 06, 2005: 01

Severity
normal

Exploitable
remote

Bugzilla entries