- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200905-08 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: High Title: NTP: Remote execution of arbitrary code Date: May 26, 2009 Bugs: #263033, #268962 ID: 200905-08 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======== Multiple errors in the NTP client and server programs might allow for the remote execution of arbitrary code. Background ========== NTP contains the client and daemon implementations for the Network Time Protocol. Affected packages ================= ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-misc/ntp < 4.2.4_p7 >= 4.2.4_p7 Description =========== Multiple vulnerabilities have been found in the programs included in the NTP package: * Apple Product Security reported a boundary error in the cookedprint() function in ntpq/ntpq.c, possibly leading to a stack-based buffer overflow (CVE-2009-0159). * Chris Ries of CMU reported a boundary error within the crypto_recv() function in ntpd/ntp_crypto.c, possibly leading to a stack-based buffer overflow (CVE-2009-1252). Impact ====== A remote attacker might send a specially crafted package to a machine running ntpd, possibly resulting in the remote execution of arbitrary code with the privileges of the user running the daemon, or a Denial of Service. NOTE: Successful exploitation requires the "autokey" feature to be enabled. This feature is only available if NTP was built with the 'ssl' USE flag. Furthermore, a remote attacker could entice a user into connecting to a malicious server using ntpq, possibly resulting in the remote execution of arbitrary code with the privileges of the user running the application, or a Denial of Service. Workaround ========== You can protect against CVE-2009-1252 by disabling the 'ssl' USE flag and recompiling NTP. Resolution ========== All NTP users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=net-misc/ntp-4.2.4_p7" References ========== [ 1 ] CVE-2009-0159 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0159 [ 2 ] CVE-2009-1252 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1252 Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200905-08.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@xxxxxxxxxx or alternatively, you may file a bug at http://bugs.gentoo.org. License ======= Copyright 2009 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/2.5
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