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Location: Barcelona, Spain
|Posted: Wed Apr 06, 2005 12:36 pm Post subject: [ GLSA 200504-04 ] mit-krb5: Multiple buffer overflows in te
|Gentoo Linux Security Advisory
Title: mit-krb5: Multiple buffer overflows in telnet client (GLSA 200504-04)
Date: April 06, 2005
The mit-krb5 telnet client is vulnerable to two buffer overflows, which could allow a malicious telnet server operator to execute arbitrary code.
The MIT Kerberos 5 implementation provides a command line telnet client which is used for remote login via the telnet protocol.
Vulnerable: < 1.3.6-r2
Unaffected: >= 1.3.6-r2
Architectures: All supported architectures
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.
There is no known workaround at this time.
All mit-krb5 users should upgrade to the latest version:
|# emerge --sync
# emerge --ask --oneshot --verbose ">=app-crypt/mit-krb5-1.3.6-r2"
Last edited by GLSA on Tue Nov 14, 2006 4:17 am; edited 3 times in total