high
7.5
CWE
361
Advisory Published
CVE Published
Updated

CVE-2015-5300

First published: Tue Oct 13 2015(Updated: )

It was found that ntpd did not correctly implement the -g option: -g Normally, ntpd exits with a message to the system log if the offset exceeds the panic threshold, which is 1000 s by default. This option allows the time to be set to any value without restriction; however, this can happen only once. If the thresh‐ old is exceeded after that, ntpd will exit with a message to the system log. This option can be used with the -q and -x options. See the tinker command for other options. ntpd could actually step the clock multiple times by more than the panic threshold if its clock discipline doesn't have enough time to reach the sync state and stay there for at least one update. If a man-in-the-middle attacker can control the NTP traffic since ntpd was started (or maybe up to 15-30 minutes after that), they can prevent the client from reaching the sync state and force it to step its clock by any amount any number of times, which can be used by attackers to expire certificates, etc. This is contrary to what the documentation says. Normally, the assumption is that an MITM attacker can step the clock more than the panic threshold only once when ntpd starts and to make a larger adjustment the attacker has to divide it into multiple smaller steps, each taking 15 minutes, which is slow.

Credit: secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
redhat/ntp<4.2.8
4.2.8
Fedoraproject Fedora=21
Fedoraproject Fedora=22
SUSE Linux Enterprise Debuginfo=11-sp2
SUSE Linux Enterprise Debuginfo=11-sp3
SUSE Linux Enterprise Debuginfo=11-sp4
openSUSE Leap=42.1
openSUSE openSUSE=13.2
SUSE Linux Enterprise Desktop=12
SUSE Linux Enterprise Desktop=12-sp1
SUSE Linux Enterprise Server=10-sp4
SUSE Linux Enterprise Server=11-sp2
SUSE Linux Enterprise Server=11-sp3
SUSE Linux Enterprise Server=11-sp4
SUSE Linux Enterprise Server=12-sp1
SUSE Linux Enterprise Software Development Kit=12
SUSE Linux Enterprise Software Development Kit=12-sp1
SUSE Manager=2.1
Suse Manager Proxy=2.1
SUSE OpenStack Cloud=5
SUSE SUSE Linux Enterprise Server=12
Redhat Enterprise Linux Desktop=6.0
Redhat Enterprise Linux Desktop=7.0
Redhat Enterprise Linux Hpc Node=6.0
Redhat Enterprise Linux Hpc Node=7.0
Redhat Enterprise Linux Hpc Node Eus=7.1
Redhat Enterprise Linux Server=6.0
Redhat Enterprise Linux Server=7.0
Redhat Enterprise Linux Server Eus=6.7.z
Redhat Enterprise Linux Server Eus=7.1
Redhat Enterprise Linux Workstation=6.0
Redhat Enterprise Linux Workstation=7.0
Debian Debian Linux=7.0
Debian Debian Linux=8.0
Canonical Ubuntu Linux=12.04
Canonical Ubuntu Linux=14.04
Canonical Ubuntu Linux=15.04
Canonical Ubuntu Linux=15.10
NTP ntp<=4.2.8

Remedy

http://support.ntp.org/bin/view/Main/NtpBug2956

Remedy

http://support.ntp.org/bin/view/Main/SecurityNotice#January_2016_NTP_4_2_8p5_Securit

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