Bug 1274264 (CVE-2015-7855) - CVE-2015-7855 ntp: ASSERT in decodenetnum() on invalid values
Summary: CVE-2015-7855 ntp: ASSERT in decodenetnum() on invalid values
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2015-7855
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: 1296162
Blocks: 1260670
TreeView+ depends on / blocked
 
Reported: 2015-10-22 11:32 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 13:22:05 UTC
Embargoed:

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System ID Private Priority Status Summary Last Updated
Red Hat Knowledge Base (Solution) 2024443 0 None None None Never

Description Martin Prpič 2015-10-22 11:32:33 UTC 
It was found that NTP's decodenetnum() would abort with an assertion failure when processing a mode 6 or mode 7 packet containing an unusually long data value where a network address was expected. This could allow an authenticated attacker to crash ntpd.

External References:

https://github.com/ntp-project/ntp/blob/stable/NEWS#L295
http://support.ntp.org/bin/view/Main/SecurityNotice#October_2015_NTP_Security_Vulner
Comment 1 Martin Prpič 2015-10-23 09:10:23 UTC 
Upstream patch:

https://github.com/ntp-project/ntp/commit/ba716a464ecb20618560075f2e4e1051e5b6f24f
Comment 5 Martin Prpič 2016-01-06 13:54:04 UTC 
Created ntp tracking bugs for this issue:

Affects: fedora-all [bug 1296162]
Comment 7 Martin Prpič 2016-01-07 13:22:05 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 support for the mrulist feature, which exposes the decodenetnum() function.
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