Bug 1300267 (CVE-2015-7975) - CVE-2015-7975 ntp: nextvar() missing length check in ntpq
Summary: CVE-2015-7975 ntp: nextvar() missing length check in ntpq
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2015-7975
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1300277
Blocks: 1297474
TreeView+ depends on / blocked
 
Reported: 2016-01-20 11:41 UTC by Martin Prpič
Modified: 2021-02-17 04:29 UTC (History)
1 user (show)

Fixed In Version: ntp 4.2.8p6
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2016-01-20 14:34:17 UTC

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Description Martin Prpič 2016-01-20 11:41:42 UTC 
It was found that ntpq did not implement a proper lenght check when calling nextvar(), which executes a memcpy(), on the name buffer.

A remote attacker could potentially use this flaw to crash an ntpq client instance.

Upstream patch:

https://github.com/ntp-project/ntp/commit/12f1323d18c8d74eb14fb5ac5574183d779794c5
Comment 1 Martin Prpič 2016-01-20 11:50:49 UTC 
External References:

http://support.ntp.org/bin/view/Main/SecurityNotice#January_2016_NTP_4_2_8p6_Securit
http://www.talosintel.com/reports/TALOS-2016-0072/
Comment 2 Martin Prpič 2016-01-20 12:01:48 UTC 
Created ntp tracking bugs for this issue:

Affects: fedora-all [bug 1300277]
Comment 3 Martin Prpič 2016-01-20 14:34:17 UTC 
Statement:

This issue did not affect the versions of ntp as shipped with Red Hat Enterprise Linux 5, 6, and 7 as they do not include the affected code, which was introduced in version 4.2.8 of NTP.
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