===================================================================== CERT-Renater Note d'Information No. 2005/VULN101 _____________________________________________________________________ DATE : 22/02/2005 HARDWARE PLATFORM(S) : / OPERATING SYSTEM(S) : Systems running PuTTY versions prior to 0.57. ====================================================================== - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200502-28 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Normal Title: PuTTY: Remote code execution Date: February 21, 2005 Bugs: #82753 ID: 200502-28 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======== PuTTY was found to contain vulnerabilities that can allow a malicious SFTP server to execute arbitrary code on unsuspecting PSCP and PSFTP clients. Background ========== PuTTY is a popular SSH client, PSCP is a secure copy implementation, and PSFTP is a SSH File Transfer Protocol client. Affected packages ================= ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-misc/putty < 0.57 >= 0.57 Description =========== Two vulnerabilities have been discovered in the PSCP and PSFTP clients, which can be triggered by the SFTP server itself. These issues are caused by the improper handling of the FXP_READDIR response, along with other string fields. Impact ====== An attacker can setup a malicious SFTP server that would send these malformed responses to a client, potentially allowing the execution of arbitrary code on their system. Workaround ========== There is no known workaround at this time. Resolution ========== All PuTTY users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=net-misc/putty-0.57" References ========== [ 1 ] PuTTY vulnerability vuln-sftp-readdir http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-sftp-readdir.html [ 2 ] PuTTY vulnerability vuln-sftp-string http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-sftp-string.html [ 3 ] CAN-2005-0467 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0467 [ 4 ] iDEFENSE Advisory http://www.idefense.com/application/poi/display?id=201&type=vulnerabilities Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200502-28.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 ====================================================================== ========================================================= Les serveurs de référence du CERT-Renater http://www.urec.fr/securite http://www.cru.fr/securite http://www.renater.fr ========================================================= + CERT-RENATER | tel : 01-53-94-20-44 + + 151 bd de l'Hopital | fax : 01-53-94-20-41 + + 75013 Paris | email: certsvp@renater.fr + =========================================================