Bug 1274258 - (CVE-2015-7850) CVE-2015-7850 ntp: remote configuration denial of service vulnerability
CVE-2015-7850 ntp: remote configuration denial of service vulnerability
Status: CLOSED NOTABUG
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
low Severity low
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Assigned To: Red Hat Product Security
impact=low,public=20151021,reported=2...
: Security
Depends On: 1296167
Blocks: 1260670
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Reported: 2015-10-22 07:30 EDT by Martin Prpič
Modified: 2016-05-09 21:53 EDT (History)
7 users (show)

See Also:
Fixed In Version: ntp 4.2.8p4
Doc Type: Bug Fix
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Last Closed: 2016-01-07 07:07:18 EST
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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Knowledge Base (Solution) 2024443 None None None Never

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Description Martin Prpič 2015-10-22 07:30:26 EDT
The following flaw was found in ntpd:

An exploitable denial of service vulnerability exists in the remote configuration functionality of the Network Time Protocol. A specially crafted configuration file could cause an endless loop resulting in a denial of service. An attacker could provide a the malicious configuration file to trigger this vulnerability.

External References:

http://talosintel.com/reports/TALOS-2015-0055/
http://support.ntp.org/bin/view/Main/SecurityNotice#October_2015_NTP_Security_Vulner
Comment 3 Martin Prpič 2016-01-06 08:58:13 EST
Created ntp tracking bugs for this issue:

Affects: fedora-all [bug 1296167]
Comment 5 Martin Prpič 2016-01-07 07:07:18 EST
Closing this as notabug:

The issue relies on the fact that an attacker could provide a crafted config file that could cause ntpd loop infinitely. Fixing this one case does not prevent the attacker from pointing ntpd to the e.g. /dev/zero file, which would have the same effect. This issue is limited to users who are able to use the :config command.

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