high
7.5
CWE
20
Advisory Published
CVE Published
Updated

CVE-2015-7691: Input Validation

First published: Thu Oct 22 2015(Updated: )

It was found that the fix for <a href="https://access.redhat.com/security/cve/CVE-2014-9750">CVE-2014-9750</a> was incomplete: three issues were found in the value length checks in ntp_crypto.c, where a packet with particular autokey operations that contained malicious data was not always being completely validated. Receipt of these packets can cause ntpd to crash. Upstream patch: <a href="https://github.com/ntp-project/ntp/commit/c4cd4aaf418f57f7225708a93bf48afb2bc9c1da">https://github.com/ntp-project/ntp/commit/c4cd4aaf418f57f7225708a93bf48afb2bc9c1da</a> Mitigation: Disable NTP autokey authentication by removing, or commenting out, all configuration directives beginning with the 'crypto' keyword in your ntp.conf file. External References: <a href="https://github.com/ntp-project/ntp/blob/stable/NEWS#L11">https://github.com/ntp-project/ntp/blob/stable/NEWS#L11</a> <a href="http://support.ntp.org/bin/view/Main/SecurityNotice#October_2015_NTP_Security_Vulner">http://support.ntp.org/bin/view/Main/SecurityNotice#October_2015_NTP_Security_Vulner</a>

Credit: cve@mitre.org

Affected SoftwareAffected VersionHow to fix
redhat/ntp<4.2.8
4.2.8
NTP>=4.2.0<4.2.8
NTP>=4.3.0<4.3.77
NTP=4.2.8
NTP=4.2.8-p1
NTP=4.2.8-p1-beta1
NTP=4.2.8-p1-beta2
NTP=4.2.8-p1-beta3
NTP=4.2.8-p1-beta4
NTP=4.2.8-p1-beta5
NTP=4.2.8-p1-rc1
NTP=4.2.8-p1-rc2
NTP=4.2.8-p2
NTP=4.2.8-p2-rc1
NTP=4.2.8-p2-rc2
NTP=4.2.8-p2-rc3
NTP=4.2.8-p3
NTP=4.2.8-p3-rc1
NTP=4.2.8-p3-rc2
NTP=4.2.8-p3-rc3
Oracle Linux=6
Debian Linux=7.0
Debian Linux=8.0
Debian Linux=9.0
NetApp OnCommand Performance Manager
NetApp OnCommand Unified Manager
IBM Data ONTAP
IBM Data ONTAP
Red Hat Enterprise Linux Desktop=6.0
Red Hat Enterprise Linux Desktop=7.0
Red Hat Enterprise Linux Server=6.0
Red Hat Enterprise Linux Server=7.0
Red Hat Enterprise Linux Server=7.3
Red Hat Enterprise Linux Server=7.4
Red Hat Enterprise Linux Server=7.6
Red Hat Enterprise Linux Server=7.7
Red Hat Enterprise Linux Server=7.3
Red Hat Enterprise Linux Server=7.4
Red Hat Enterprise Linux Server=7.5
Red Hat Enterprise Linux Server=7.6
Red Hat Enterprise Linux Server=7.7
Red Hat Enterprise Linux Server=7.3
Red Hat Enterprise Linux Server=7.6
Red Hat Enterprise Linux Server=7.7
Red Hat Enterprise Linux Workstation=6.0
Red Hat Enterprise Linux Workstation=7.0

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2015-7691?

    CVE-2015-7691 has a moderate severity level, impacting the integrity of NTP packets.

  • How do I fix CVE-2015-7691?

    To fix CVE-2015-7691, upgrade the NTP software to version 4.2.8 or higher.

  • Which software versions are affected by CVE-2015-7691?

    CVE-2015-7691 affects NTP versions prior to 4.2.8, including versions between 4.2.0 and 4.3.77.

  • What type of vulnerability is CVE-2015-7691?

    CVE-2015-7691 is a cryptographic vulnerability that involves improper handling of packet length checks.

  • Is CVE-2015-7691 associated with specific operating systems?

    Yes, CVE-2015-7691 impacts various operating systems running affected versions of NTP, including Red Hat and Debian.

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