|Summary:||CVE-2015-1821 chrony: Heap out of bound write in address filter|
|Product:||[Other] Security Response||Reporter:||Kurt Seifried <kseifried>|
|Component:||vulnerability||Assignee:||Red Hat Product Security <security-response-team>|
|Status:||CLOSED ERRATA||QA Contact:|
|Fixed In Version:||Doc Type:||Bug Fix|
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.
|Last Closed:||2015-11-20 05:27:26 UTC||Type:||---|
|oVirt Team:||---||RHEL 7.3 requirements from Atomic Host:|
|Bug Depends On:||1209633, 1209634, 1221579|
|Bug Blocks:||1200382, 1210268|
Description Kurt Seifried 2015-04-07 20:45:21 UTC
Miroslav Lichvar of Red Hat reports: When NTP or cmdmon access is configured (from chrony.conf or over authenticated cmdmon) with a subnet size that is not divisible by 4 and address that has nonzero bits in the 4-bit subnet remainder (e.g. f0::/3), the TableNode array index is calculated incorrectly and it may write past the array.
Comment 1 Kurt Seifried 2015-04-07 20:47:20 UTC
Acknowledgements: This issue was discovered by Miroslav Lichvár of Red Hat.
Comment 2 Kurt Seifried 2015-04-07 20:49:17 UTC
Created chrony tracking bugs for this issue: Affects: epel-all [bug 1209633]
Comment 3 Kurt Seifried 2015-04-07 20:51:33 UTC
Created chrony tracking bugs for this issue: Affects: fedora-all [bug 1209634]
Comment 4 Kurt Seifried 2015-04-08 15:59:20 UTC
This issue was fixed upstream: http://chrony.tuxfamily.org/News.html The updated version is available at: http://download.tuxfamily.org/chrony/chrony-1.31.1.tar.gz
Comment 5 Fedora Update System 2015-04-22 22:43:00 UTC
chrony-2.0-0.3.pre2.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.
Comment 6 Fedora Update System 2015-04-22 22:53:45 UTC
chrony-1.31.1-1.fc21 has been pushed to the Fedora 21 stable repository. If problems still persist, please make note of it in this bug report.
Comment 7 Fedora Update System 2015-04-23 19:00:48 UTC
chrony-1.31.1-1.el6 has been pushed to the Fedora EPEL 6 stable repository. If problems still persist, please make note of it in this bug report.
Comment 8 Fedora Update System 2015-04-23 19:02:43 UTC
chrony-1.31.1-1.el5 has been pushed to the Fedora EPEL 5 stable repository. If problems still persist, please make note of it in this bug report.
Comment 9 Fedora Update System 2015-04-24 22:49:59 UTC
chrony-1.31.1-1.fc20 has been pushed to the Fedora 20 stable repository. If problems still persist, please make note of it in this bug report.