- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200504-04 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Normal Title: mit-krb5: Multiple buffer overflows in telnet client Date: April 06, 2005 Bugs: #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 / Vulnerable / Unaffected ------------------------------------------------------------------- 1 app-crypt/mit-krb5 < 1.3.6-r2 >= 1.3.6-r2 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 ========== [ 1 ] CAN-2005-0468 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0468 [ 2 ] CAN-2005-0469 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0469 [ 3 ] MITKRB5-SA-2005-001 http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2005-001-telnet.txt Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200504-04.xml Concerns? ========= Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at http://bugs.gentoo.org. License ======= Copyright 2005 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license. http://creativecommons.org/licenses/by-sa/2.0