CVE-2015-7704 Denial of service in n/a

High 7.5 Published 7 Aug 2017 Updated 6 Aug 2024

Remote attackers can cause a denial of service in the NTP daemon by sending crafted KOD messages, requiring an upgrade to patched versions.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2015-7704?

CVE-2015-7704 is a high-severity denial of service vulnerability in Citrix Xenserver, published on 7 Aug 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

The ntpd client in NTP 4.x before 4.2.8p4 and 4.3.x before 4.3.77 allows remote attackers to cause a denial of service via a number of crafted "KOD" messages.

Weakness: CWE-20

Which versions are affected by CVE-2015-7704?

It affects 14 products.

Linux distribution packages (20)

`ntp` Red Hat:rhel_eus:6.5::computenode	All versions	`0:4.2.6p5-2.el6_5.1`
`ntp-debuginfo` Red Hat:rhel_eus:6.5::computenode	All versions	`0:4.2.6p5-2.el6_5.1`
`ntp-doc` Red Hat:rhel_eus:6.5::computenode	All versions	`0:4.2.6p5-2.el6_5.1`
`ntp-perl` Red Hat:rhel_eus:6.5::computenode	All versions	`0:4.2.6p5-2.el6_5.1`
`ntpdate` Red Hat:rhel_eus:6.5::computenode	All versions	`0:4.2.6p5-2.el6_5.1`
`ntp` Red Hat:rhel_eus:6.5::server	All versions	`0:4.2.6p5-2.el6_5.1`
`ntp-debuginfo` Red Hat:rhel_eus:6.5::server	All versions	`0:4.2.6p5-2.el6_5.1`
`ntp-doc` Red Hat:rhel_eus:6.5::server	All versions	`0:4.2.6p5-2.el6_5.1`
`ntp-perl` Red Hat:rhel_eus:6.5::server	All versions	`0:4.2.6p5-2.el6_5.1`
`ntpdate` Red Hat:rhel_eus:6.5::server	All versions	`0:4.2.6p5-2.el6_5.1`
`ntp` Red Hat:rhel_eus:6.6::computenode	All versions	`0:4.2.6p5-3.el6_6.1`
`ntp-debuginfo` Red Hat:rhel_eus:6.6::computenode	All versions	`0:4.2.6p5-3.el6_6.1`
`ntp-doc` Red Hat:rhel_eus:6.6::computenode	All versions	`0:4.2.6p5-3.el6_6.1`
`ntp-perl` Red Hat:rhel_eus:6.6::computenode	All versions	`0:4.2.6p5-3.el6_6.1`
`ntpdate` Red Hat:rhel_eus:6.6::computenode	All versions	`0:4.2.6p5-3.el6_6.1`
`ntp` Red Hat:rhel_eus:6.6::server	All versions	`0:4.2.6p5-3.el6_6.1`
`ntp-debuginfo` Red Hat:rhel_eus:6.6::server	All versions	`0:4.2.6p5-3.el6_6.1`
`ntp-doc` Red Hat:rhel_eus:6.6::server	All versions	`0:4.2.6p5-3.el6_6.1`
`ntp-perl` Red Hat:rhel_eus:6.6::server	All versions	`0:4.2.6p5-3.el6_6.1`
`ntpdate` Red Hat:rhel_eus:6.6::server	All versions	`0:4.2.6p5-3.el6_6.1`

Products include Citrix Xenserver, Debian Debian Linux, Mcafee Enterprise Security Manager, Netapp Clustered Data Ontap, Netapp Data Ontap, Netapp Oncommand Performance Manager and 8 more.

How do I fix CVE-2015-7704?

Upgrade to a fixed version.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2015-7704 being exploited?

There is no known exploitation of CVE-2015-7704 in the wild and no public exploit code.

All Citrix Xenserver vulnerabilities

Sources

Also known as DEBIAN-CVE-2015-7704, GHSA-jm9v-x8m5-p6p2, RHSA-2015:2520, UBUNTU-CVE-2015-7704.