Bug 1274262 (CVE-2015-7853) - CVE-2015-7853 ntp: reference clock memory corruption vulnerability
Summary: CVE-2015-7853 ntp: reference clock memory corruption vulnerability
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2015-7853
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1296163
Blocks: 1260670
TreeView+ depends on / blocked
 
Reported: 2015-10-22 11:31 UTC by Martin Prpič
Modified: 2021-02-17 04:48 UTC (History)
7 users (show)

Fixed In Version: ntp 4.2.8p4
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2016-01-07 13:19:05 UTC
Embargoed:

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Red Hat Knowledge Base (Solution) 2024443 0 None None None Never

Description Martin Prpič 2015-10-22 11:31:44 UTC 
The following flaw was found in ntpd:

A potential buffer overflow vulnerability exists in the refclock of ntpd. An invalid length provided by a hardware reference clock could cause a buffer overflow potentially resulting in memory being modified. A malicious reflock could provide a negative length to trigger this vulnerability.

External References:

http://talosintel.com/reports/TALOS-2015-0064/
http://support.ntp.org/bin/view/Main/SecurityNotice#October_2015_NTP_Security_Vulner
Comment 1 Martin Prpič 2015-10-23 09:12:00 UTC 
Upstream patch:

https://github.com/ntp-project/ntp/commit/8482b536f9494a5d45196ab5b7e13040f5940261
Comment 3 Martin Prpič 2016-01-06 13:55:04 UTC 
Created ntp tracking bugs for this issue:

Affects: fedora-all [bug 1296163]
Comment 5 Martin Prpič 2016-01-07 13:19:05 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 custom refclock driver.
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