Test Kennung:	1.3.6.1.4.1.25623.1.0.871505
Kategorie:	Red Hat Local Security Checks
Titel:	RedHat Update for chrony RHSA-2015:2241-03
Zusammenfassung:	The remote host is missing an update for the 'chrony'; package(s) announced via the referenced advisory.
Beschreibung:	Summary: The remote host is missing an update for the 'chrony' package(s) announced via the referenced advisory. Vulnerability Insight: The chrony suite, chronyd and chronyc, is an advanced implementation of the Network Time Protocol (NTP), specially designed to support systems with intermittent connections. It can synchronize the system clock with NTP servers, hardware reference clocks, and manual input. It can also operate as an NTPv4 (RFC 5905) server or peer to provide a time service to other computers in the network. An out-of-bounds write flaw was found in the way chrony stored certain addresses when configuring NTP or cmdmon access. An attacker that has the command key and is allowed to access cmdmon (only localhost is allowed by default) could use this flaw to crash chronyd or, possibly, execute arbitrary code with the privileges of the chronyd process. (CVE-2015-1821) An uninitialized pointer use flaw was found when allocating memory to save unacknowledged replies to authenticated command requests. An attacker that has the command key and is allowed to access cmdmon (only localhost is allowed by default) could use this flaw to crash chronyd or, possibly, execute arbitrary code with the privileges of the chronyd process. (CVE-2015-1822) A denial of service flaw was found in the way chrony hosts that were peering with each other authenticated themselves before updating their internal state variables. An attacker could send packets to one peer host, which could cascade to other peers, and stop the synchronization process among the reached peers. (CVE-2015-1853) These issues were discovered by Miroslav Lichvar of Red Hat. The chrony packages have been upgraded to upstream version 2.1.1, which provides a number of bug fixes and enhancements over the previous version. Notable enhancements include: * Updated to NTP version 4 (RFC 5905) * Added pool directive to specify pool of NTP servers * Added leapsecmode directive to select how to correct clock for leap second * Added smoothtime directive to smooth served time and enable leap smear * Added asynchronous name resolving with POSIX threads * Ready for year 2036 (next NTP era) * Improved clock control * Networking code reworked to open separate client sockets for each NTP server (BZ#1117882) This update also fixes the following bug: * The chronyd service previously assumed that network interfaces specified with the 'bindaddress' directive were ready when the service was started. This could cause chronyd to fail to bind an NTP server socket to the interface if the interface was not ready. With this update, chronyd uses the IP_FREEBIND socket option, enabling it to bind to an interface later, not only when the service starts. (BZ#11693 ... Description truncated, please see the referenced URL(s) for more information. Affected Software/OS: chrony on Red Hat Enterprise Linux Server (v. 7) Solution: Please Install the Updated Packages. CVSS Score: 6.5 CVSS Vector: AV:N/AC:L/Au:S/C:P/I:P/A:P
Querverweis:	Common Vulnerability Exposure (CVE) ID: CVE-2015-1821 BugTraq ID: 73955 http://www.securityfocus.com/bid/73955 Debian Security Information: DSA-3222 (Google Search) http://www.debian.org/security/2015/dsa-3222 https://security.gentoo.org/glsa/201507-01 http://listengine.tuxfamily.org/chrony.tuxfamily.org/chrony-announce/2015/04/msg00002.html Common Vulnerability Exposure (CVE) ID: CVE-2015-1822 BugTraq ID: 73956 http://www.securityfocus.com/bid/73956 Common Vulnerability Exposure (CVE) ID: CVE-2015-1853 http://chrony.tuxfamily.org/News.html
Copyright	Copyright (C) 2015 Greenbone Networks GmbH

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