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mit-krb5: Multiple buffer overflows in telnet client


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


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


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


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.


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


There is no known workaround at this time.


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


Page updated April 06, 2005

Summary: This is a Gentoo Linux Security Advisory

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