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Red Hat 6/7: 2015:1930-01 Important NTP Update DoS Threat

red hat
Calendar Grey October 26, 2015
Dist Redhat Esm H88
Important NTP patch for Red Hat Enterprise Linux mitigates Denial of Service vulnerabilities and strengthens time sync safeguarding.
Updated ntp packages that fix two security issues are now available for Red Hat Enterprise Linux 6 and 7

Solution

Before applying this update, make sure all previously released errata relevant to your system have been applied.

For details on how to apply this update, refer to:

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

Summary

The Network Time Protocol (NTP) is used to synchronize a computer's time with a referenced time source.
It was discovered that ntpd as a client did not correctly check timestamps in Kiss-of-Death packets. A remote attacker could use this flaw to send a crafted Kiss-of-Death packet to an ntpd client that would increase the client's polling interval value, and effectively disable synchronization with the server. (CVE-2015-7704)
It was found that ntpd did not correctly implement the threshold limitation for the '-g' option, which is used to set the time without any restrictions. A man-in-the-middle attacker able to intercept NTP traffic between a connecting client and an NTP server could use this flaw to force that client to make multiple steps larger than the panic threshold, effectively changing the time to an arbitrary value. (CVE-2015-5300)
Red Hat would like to thank Aanchal Malhotra, Isaac E. Cohen, and Sharon Goldberg of Boston University for reporting these issues.
All ntp users are advised to upgrade to these updated packages, which contain backported patches to resolve these issues. After installing the update, the ntpd daemon will restart automatically.

Topics%20covered

Topics Covered

security advisory security issue Red Hat DoS time synchronization important update ntp

References

https://access.redhat.com/security/cve/CVE-2015-5300 https://access.redhat.com/security/cve/CVE-2015-7704 https://access.redhat.com/security/updates/classification/#important

Package List

Red Hat Enterprise Linux Desktop (v. 6):
Source: ntp-4.2.6p5-5.el6_7.2.src.rpm
i386: ntp-4.2.6p5-5.el6_7.2.i686.rpm ntp-debuginfo-4.2.6p5-5.el6_7.2.i686.rpm ntpdate-4.2.6p5-5.el6_7.2.i686.rpm
x86_64: ntp-4.2.6p5-5.el6_7.2.x86_64.rpm ntp-debuginfo-4.2.6p5-5.el6_7.2.x86_64.rpm ntpdate-4.2.6p5-5.el6_7.2.x86_64.rpm
Red Hat Enterprise Linux Desktop Optional (v. 6):
i386: ntp-debuginfo-4.2.6p5-5.el6_7.2.i686.rpm ntp-perl-4.2.6p5-5.el6_7.2.i686.rpm
noarch: ntp-doc-4.2.6p5-5.el6_7.2.noarch.rpm
x86_64: ntp-debuginfo-4.2.6p5-5.el6_7.2.x86_64.rpm ntp-perl-4.2.6p5-5.el6_7.2.x86_64.rpm
Red Hat Enterprise Linux HPC Node (v. 6):
Source: ntp-4.2.6p5-5.el6_7.2.src.rpm
x86_64: ntp-4.2.6p5-5.el6_7.2.x86_64.rpm ntp-debuginfo-4.2.6p5-5.el6_7.2.x86_64.rpm ntpdate-4.2.6p5-5.el6_7.2.x86_64.rpm
Red Hat Enterprise Linux HPC Node Optional (v. 6):
noarch: ntp-doc-4.2.6p5-5.el6_7.2.noarch.rpm
x86_64: ntp-debuginfo-4.2.6p5-5.el6_7.2.x86_64.rpm ntp-perl-4.2.6p5-5.el6_7.2.x86_64.rpm
Red Hat Enterprise Linux Server (v. 6):
Source: ntp-4.2.6p5-5.el6_7.2.src.rpm
i386: ntp-4.2.6p5-5.el6_7.2.i686.rpm ntp-debuginfo-4.2.6p5-5.el6_7.2.i686.rpm ntpdate-4.2.6p5-5.el6_7.2.i686.rpm
ppc64: ntp-4.2.6p5-5.el6_7.2.ppc64.rpm ntp-debuginfo-4.2.6p5-5.el6_7.2.ppc64.rpm ntpdate-4.2.6p5-5.el6_7.2.ppc64.rpm
s390x:

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2015:1930-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2015:1930.html
Issue date: 2015-10-26

Topic

Updated ntp packages that fix two security issues are now available forRed Hat Enterprise Linux 6 and 7.Red Hat Product Security has rated this update as having Important securityimpact. Common Vulnerability Scoring System (CVSS) base scores, which givedetailed severity ratings, are available for each vulnerability from theCVE links in the References section.

Topics%20covered

Topics Covered

security advisory security issue Red Hat DoS time synchronization important update ntp

Relevant Releases Architectures

Red Hat Enterprise Linux Client (v. 7) - x86_64

Red Hat Enterprise Linux Client Optional (v. 7) - noarch, x86_64

Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64

Red Hat Enterprise Linux ComputeNode Optional (v. 7) - noarch, x86_64

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64

Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, noarch, x86_64

Red Hat Enterprise Linux HPC Node (v. 6) - x86_64

Red Hat Enterprise Linux HPC Node Optional (v. 6) - noarch, x86_64

Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64

Red Hat Enterprise Linux Server (v. 7) - ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Server Optional (v. 6) - i386, noarch, ppc64, s390x, x86_64

Red Hat Enterprise Linux Server Optional (v. 7) - noarch, ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64

Red Hat Enterprise Linux Workstation (v. 7) - x86_64

Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, noarch, x86_64

Red Hat Enterprise Linux Workstation Optional (v. 7) - noarch, x86_64

Bugs Fixed

1271070 - CVE-2015-7704 ntp: disabling synchronization via crafted KoD packet

1271076 - CVE-2015-5300 ntp: MITM attacker can force ntpd to make a step larger than the panic threshold

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