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Gentoo alert 200504-01 (telnet-bsd)

From:  Thierry Carrez <koon@gentoo.org>
To:  gentoo-announce@robin.gentoo.org
Subject:  [gentoo-announce] [ GLSA 200504-01 ] telnet-bsd: Multiple buffer overflows
Date:  Fri, 01 Apr 2005 13:22:48 +0200
Cc:  bugtraq@securityfocus.com, full-disclosure@lists.grok.org.uk, security-alerts@linuxsecurity.com

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200504-01 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Normal Title: telnet-bsd: Multiple buffer overflows Date: April 01, 2005 Bugs: #87019 ID: 200504-01 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======== The telnet-bsd telnet client is vulnerable to two buffer overflows, which could allow a malicious telnet server operator to execute arbitrary code. Background ========== telnet-bsd provides a command line telnet client which is used for remote login using the telnet protocol. Affected packages ================= ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-misc/telnet-bsd < 1.0-r1 >= 1.0-r1 Description =========== A buffer overflow has been identified in the env_opt_add() function of telnet-bsd, 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 host using telnet, potentially executing arbitrary code with the permissions of the telnet user. Workaround ========== There is no known workaround at this time. Resolution ========== All telnet-bsd users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=net-misc/telnet-bsd-1.0-r1" References ========== [ 1 ] CAN-2005-0468 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0468 [ 2 ] IDEF0867 http://www.idefense.com/application/poi/display?id=221&... [ 3 ] CAN-2005-0469 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0469 [ 4 ] IDEF0866 http://www.idefense.com/application/poi/display?id=220&... Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200504-01.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


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