high
7.5
CWE
331
Advisory Published
CVE Published
Updated

CVE-2015-3405

First published: Thu Apr 09 2015(Updated: )

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: <a href="https://bugs.ntp.org/show_bug.cgi?id=2797">https://bugs.ntp.org/show_bug.cgi?id=2797</a> Upstream patch: <a href="http://bk1.ntp.org/ntp-stable/?PAGE=patch&amp;REV=55199296N2gFqH1Hm5GOnhrk9Ypygg">http://bk1.ntp.org/ntp-stable/?PAGE=patch&amp;REV=55199296N2gFqH1Hm5GOnhrk9Ypygg</a> CVE request: <a href="http://seclists.org/oss-sec/2015/q2/85">http://seclists.org/oss-sec/2015/q2/85</a>

Credit: secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
NTP ntp=4.2.8-p1
NTP ntp=4.2.8-p2
NTP ntp=4.2.8-p2-rc1
NTP ntp=4.3.0
NTP ntp=4.3.1
NTP ntp=4.3.2
NTP ntp=4.3.3
NTP ntp=4.3.4
NTP ntp=4.3.5
NTP ntp=4.3.6
NTP ntp=4.3.7
NTP ntp=4.3.8
NTP ntp=4.3.9
NTP ntp=4.3.10
NTP ntp=4.3.11
Debian=7.0
Debian=8.0
opensuse suse linux enterprise server=11.0-sp3
SUSE Linux Enterprise Desktop=11.0-sp3
SUSE Linux Enterprise Server=11.0-sp3
Fedora=21
redhat enterprise Linux desktop=6.0
redhat enterprise Linux for ibm z systems=6.0
redhat enterprise Linux for power big endian=6.0
redhat enterprise Linux for scientific computing=6.0
redhat enterprise Linux server=6.0
Red Hat Enterprise Linux Server from RHUI 6=6.0
redhat enterprise Linux workstation=6.0

Remedy

https://bugzilla.redhat.com/show_bug.cgi?id=1210324

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2015-3405?

    CVE-2015-3405 is considered a medium severity vulnerability due to its potential for key guessing attacks.

  • How do I fix CVE-2015-3405?

    To fix CVE-2015-3405, upgrade the NTP software to the latest version where the issue is resolved.

  • What systems are affected by CVE-2015-3405?

    CVE-2015-3405 affects various versions of NTP, particularly those prior to 4.2.8-p3 and 4.3.10.

  • What vulnerabilities does CVE-2015-3405 address?

    CVE-2015-3405 specifically addresses the weak generation of MD5 symmetric keys in NTP, particularly on big-endian systems.

  • Can CVE-2015-3405 be exploited remotely?

    Yes, CVE-2015-3405 can potentially be exploited remotely by attackers to spoof NTP clients or servers.

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