high
7.5
CWE
20
Advisory Published
CVE Published
Updated

CVE-2015-5195: Input Validation

First published: Tue Aug 18 2015(Updated: )

It was found that ntpd exits with a segmentation fault when a statistics type that was not enabled during compilation (e.g. timingstats) is referenced by the statistics or filegen configuration command, for example: ntpq -c ':config statistics timingstats' ntpq -c ':config filegen timingstats' Upstream patch: <a href="http://bk.ntp.org/ntp-dev/?PAGE=patch&amp;REV=4d253ed0A400LyhRQIV0u23NJwuGAA">http://bk.ntp.org/ntp-dev/?PAGE=patch&amp;REV=4d253ed0A400LyhRQIV0u23NJwuGAA</a> (in 4.2.6, the code than handles NULL == filegen needs to be adjusted as the outer loop was changed from while to for)

Credit: secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
Fedora=21
Fedora=22
Fedora=23
Red Hat Enterprise Linux Desktop=6.0
Red Hat Enterprise Linux Desktop=7.0
Red Hat Enterprise Linux HPC Node=6.0
Red Hat Enterprise Linux HPC Node=7.0
Red Hat Enterprise Linux Server=6.0
Red Hat Enterprise Linux Server=7.0
Red Hat Enterprise Linux Workstation=6.0
Red Hat Enterprise Linux Workstation=7.0
Debian=7.0
Debian=8.0
Ubuntu Linux=12.04
Ubuntu Linux=14.04
Ubuntu Linux=15.04
Ubuntu Linux=15.10
NTP<=4.2.7

Remedy

http://www.openwall.com/lists/oss-security/2015/08/25/3

Remedy

https://github.com/ntp-project/ntp/commit/52e977d79a0c4ace997e5c74af429844da2f27be

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2015-5195?

    CVE-2015-5195 has been classified as a moderate severity vulnerability due to the potential for denial of service through segmentation faults.

  • How do I fix CVE-2015-5195?

    To fix CVE-2015-5195, update your NTP software to a version that addresses this segmentation fault issue.

  • Which versions are affected by CVE-2015-5195?

    CVE-2015-5195 affects several versions of NTP across Fedora, Red Hat Enterprise Linux, Debian, and Ubuntu distributions.

  • What causes the CVE-2015-5195 vulnerability?

    The vulnerability is caused by NTP exiting with a segmentation fault when referencing a statistics type that was not enabled during compilation.

  • Is CVE-2015-5195 being actively exploited?

    There is currently no evidence that CVE-2015-5195 is being actively exploited in the wild.

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