Bug 1210324 – CVE-2015-3405 ntp: ntp-keygen may generate non-random symmetric keys on big-endian systems

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Bug 1210324 - (CVE-2015-3405) CVE-2015-3405 ntp: ntp-keygen may generate non-random symmetric keys on big-endian systems

Summary:	CVE-2015-3405 ntp: ntp-keygen may generate non-random symmetric keys on big-e...

Status:	NEW

Aliases:	CVE-2015-3405

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	low Severity low
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=low,public=20150409,reported=2...
Keywords:	Security

Depends On:	1210327 1210554 1221565
Blocks:	1193283 1210268 1210330
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Reported:	2015-04-09 09:13 EDT by Martin Prpič
Modified:	2015-11-20 00:36 EST (History)
CC List:	2 users (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:	A flaw was found in the way the ntp-keygen utility generated MD5 symmetric keys on big-endian systems. An attacker could possibly use this flaw to guess generated MD5 keys, which could then be used to spoof an NTP client or server.
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Last Closed:
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
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oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
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Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2015:1459	normal	SHIPPED_LIVE	Moderate: ntp security, bug fix, and enhancement update	2015-07-21 10:15:04 EDT
Red Hat Product Errata	RHSA-2015:2231	normal	SHIPPED_LIVE	Moderate: ntp security, bug fix, and enhancement update	2015-11-19 04:03:04 EST

Groups: None (edit)

Description Martin Prpič 2015-04-09 09:13:28 EDT

A flaw was found in the way the ntp-keygen utility generated MD5 symmetric keys on big-endian systems. This could possibly allow an attacker to guess generated MD5 keys that could then be used to spoof an NTP client or server.

If the lowest byte of the temp variable is outside of the printable characters range (between 0x20 and 0x7f), the ntp-keygen utility enters an infinite loop. However, if the temp variable is within the aforementioned range, the generated MD5 key will consist of 20 identical characters, meaning only 93 possible keys can be generated.

Upstream bug:

https://bugs.ntp.org/show_bug.cgi?id=2797

Upstream patch:

http://bk1.ntp.org/ntp-stable/?PAGE=patch&REV=55199296N2gFqH1Hm5GOnhrk9Ypygg

CVE request:

http://seclists.org/oss-sec/2015/q2/85

Comment 2 Martin Prpič 2015-04-09 09:15:03 EDT

Created ntp tracking bugs for this issue:

Affects: fedora-all [bug 1210327]

Comment 4 Huzaifa S. Sidhpurwala 2015-04-10 01:04:18 EDT

Statement:

This issue affects the versions of ntp as shipped with Red Hat Enterprise Linux 5.

Red Hat Enterprise Linux 5 is now in Production 3 Phase of the support and maintenance life cycle. This has been rated as having Low security impact and is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.

Comment 5 Fedora Update System 2015-04-22 18:55:46 EDT

ntp-4.2.6p5-22.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 6 Fedora Update System 2015-04-22 18:56:02 EDT

ntp-4.2.6p5-30.fc22 has been pushed to the Fedora 22 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 7 Fedora Update System 2015-04-28 09:01:00 EDT

ntp-4.2.6p5-30.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 9 errata-xmlrpc 2015-07-22 03:00:54 EDT

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2015:1459 https://rhn.redhat.com/errata/RHSA-2015-1459.html

Comment 11 errata-xmlrpc 2015-11-19 03:39:05 EST

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2015:2231 https://rhn.redhat.com/errata/RHSA-2015-2231.html

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