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[ GLSA 200412-01 ] rssh, scponly: Unrestricted command execution
From: Thierry Carrez <koon () gentoo org>
Date: Fri, 03 Dec 2004 17:47:18 +0100
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200412-01 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Normal Title: rssh, scponly: Unrestricted command execution Date: December 03, 2004 Bugs: #72815, #72816 ID: 200412-01 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======== rssh and scponly do not filter command-line options that can be exploited to execute any command, thereby allowing a remote user to completely bypass the restricted shell. Background ========== rssh and scponly are two restricted shells, allowing only a few predefined commands. They are often used as a complement to OpenSSH to provide access to remote users without providing any remote execution privileges. Affected packages ================= ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-misc/scponly < 4.0 >= 4.0 2 app-shells/rssh <= 2.2.2 Vulnerable! ------------------------------------------------------------------- NOTE: Certain packages are still vulnerable. Users should migrate to another package if one is available or wait for the existing packages to be marked stable by their architecture maintainers. ------------------------------------------------------------------- 2 affected packages on all of their supported architectures. ------------------------------------------------------------------- Description =========== Jason Wies discovered that when receiving an authorized command from an authorized user, rssh and scponly do not filter command-line options that can be used to execute any command on the target host. Impact ====== Using a malicious command, it is possible for a remote authenticated user to execute any command (or upload and execute any file) on the target machine with user rights, effectively bypassing any restriction of scponly or rssh. Workaround ========== There is no known workaround at this time. Resolution ========== All scponly users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=net-misc/scponly-4.0" Currently, there is no released version of rssh that contains a fix for these issues. The author declared that he cannot provide a fixed version at this time. Therefore, the rssh package has been hard-masked prior to complete removal from Portage, and current users are advised to unmerge the package. References ========== [ 1 ] BugTraq Posting http://www.securityfocus.com/archive/1/383046/2004-11-30/2004-12-06/0 Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200412-01.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 2004 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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- [ GLSA 200412-01 ] rssh, scponly: Unrestricted command execution Thierry Carrez (Dec 03)