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[RHSA-2014:2025-01] Important: ntp security update

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Red Hat Security Advisory

 

Synopsis: Important: ntp security update

Advisory ID: RHSA-2014:2025-01

Product: Red Hat Enterprise Linux

Advisory URL: https://rhn.redhat.com/errata/RHSA-2014-2025.html

Issue date: 2014-12-20

CVE Names: CVE-2014-9293 CVE-2014-9294 CVE-2014-9295

=====================================================================

 

1. Summary:

 

Updated ntp packages that fix several security issues are now available for

Red Hat Enterprise Linux 5.

 

Red Hat Product Security has rated this update as having Important security

impact. A Common Vulnerability Scoring System (CVSS) base score, which

gives a detailed severity rating, is available from the CVE link in the

References section.

 

2. Relevant releases/architectures:

 

Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64

Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64

 

3. Description:

 

The Network Time Protocol (NTP) is used to synchronize a computer's time

with a referenced time source.

 

Multiple buffer overflow flaws were discovered in ntpd's crypto_recv(),

ctl_putdata(), and configure() functions. A remote attacker could use

either of these flaws to send a specially crafted request packet that could

crash ntpd or, potentially, execute arbitrary code with the privileges of

the ntp user. Note: the crypto_recv() flaw requires non-default

configurations to be active, while the ctl_putdata() flaw, by default, can

only be exploited via local attackers, and the configure() flaw requires

additional authentication to exploit. (CVE-2014-9295)

 

It was found that ntpd automatically generated weak keys for its internal

use if no ntpdc request authentication key was specified in the ntp.conf

configuration file. A remote attacker able to match the configured IP

restrictions could guess the generated key, and possibly use it to send

ntpdc query or configuration requests. (CVE-2014-9293)

 

It was found that ntp-keygen used a weak method for generating MD5 keys.

This could possibly allow an attacker to guess generated MD5 keys that

could then be used to spoof an NTP client or server. Note: it is

recommended to regenerate any MD5 keys that had explicitly been generated

with ntp-keygen; the default installation does not contain such keys).

(CVE-2014-9294)

 

All ntp users are advised to upgrade to this updated package, which

contains backported patches to resolve these issues. After installing the

update, the ntpd daemon will restart automatically.

 

4. Solution:

 

Before applying this update, make sure all previously released errata

relevant to your system have been applied.

 

This update is available via the Red Hat Network. Details on how to use the

Red Hat Network to apply this update are available at

https://access.redhat.com/articles/11258

 

5. Bugs fixed (https://bugzilla.redhat.com/):

 

1176032 - CVE-2014-9293 ntp: automatic generation of weak default key in config_auth()

1176035 - CVE-2014-9294 ntp: ntp-keygen uses weak random number generator and seed when generating MD5 keys

1176037 - CVE-2014-9295 ntp: Multiple buffer overflows via specially-crafted packets

 

6. Package List:

 

Red Hat Enterprise Linux Desktop (v. 5 client):

 

Source:

ntp-4.2.2p1-18.el5_11.src.rpm

 

i386:

ntp-4.2.2p1-18.el5_11.i386.rpm

ntp-debuginfo-4.2.2p1-18.el5_11.i386.rpm

 

x86_64:

ntp-4.2.2p1-18.el5_11.x86_64.rpm

ntp-debuginfo-4.2.2p1-18.el5_11.x86_64.rpm

 

Red Hat Enterprise Linux (v. 5 server):

 

Source:

ntp-4.2.2p1-18.el5_11.src.rpm

 

i386:

ntp-4.2.2p1-18.el5_11.i386.rpm

ntp-debuginfo-4.2.2p1-18.el5_11.i386.rpm

 

ia64:

ntp-4.2.2p1-18.el5_11.ia64.rpm

ntp-debuginfo-4.2.2p1-18.el5_11.ia64.rpm

 

ppc:

ntp-4.2.2p1-18.el5_11.ppc.rpm

ntp-debuginfo-4.2.2p1-18.el5_11.ppc.rpm

 

s390x:

ntp-4.2.2p1-18.el5_11.s390x.rpm

ntp-debuginfo-4.2.2p1-18.el5_11.s390x.rpm

 

x86_64:

ntp-4.2.2p1-18.el5_11.x86_64.rpm

ntp-debuginfo-4.2.2p1-18.el5_11.x86_64.rpm

 

These packages are GPG signed by Red Hat for security. Our key and

details on how to verify the signature are available from

https://access.redhat.com/security/team/key/

 

7. References:

 

https://access.redhat.com/security/cve/CVE-2014-9293

https://access.redhat.com/security/cve/CVE-2014-9294

https://access.redhat.com/security/cve/CVE-2014-9295

https://access.redhat.com/security/updates/classification/#important

 

8. Contact:

 

The Red Hat security contact is . More contact

details at https://access.redhat.com/security/team/contact/

 

Copyright 2014 Red Hat, Inc.

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