CVE-2016-7426 Denial of service in n/a

What is CVE-2016-7426?

CVE-2016-7426 is a high-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 13 Jan 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

NTP before 4.2.8p9 rate limits responses received from the configured sources when rate limiting for all associations is enabled, which allows remote attackers to cause a denial of service (prevent responses from the sources) by sending responses with a spoofed source address.

Weakness: CWE-400

Which versions are affected by CVE-2016-7426?

It affects 9 products.

Products include Canonical Ubuntu Linux, Hpe Hpux-Ntp, Ntp Ntp, Redhat Enterprise Linux Desktop, Redhat Enterprise Linux Server, Redhat Enterprise Linux Server Aus and 3 more.

How do I fix CVE-2016-7426?

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-2016-7426 being exploited?

There is no known exploitation of CVE-2016-7426 in the wild and no public exploit code.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2016-7426, GHSA-8wjh-3x3g-6pjf, UBUNTU-CVE-2016-7426.