CVE-2018-20615 Denial of service in n/a

High 7.5 Published 18 Mar 2019 Updated 5 Aug 2024

An out-of-bounds read in HAProxy's HTTP/2 decoder allows attackers to crash the service via malformed PRIORITY frames.

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

What is CVE-2018-20615?

CVE-2018-20615 is a high-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 18 Mar 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An out-of-bounds read issue was discovered in the HTTP/2 protocol decoder in HAProxy 1.8.x and 1.9.x through 1.9.0 which can result in a crash. The processing of the PRIORITY flag in a HEADERS frame requires 5 extra bytes, and while these bytes are skipped, the total frame length was not re-checked to make sure they were present in the frame.

Weakness: CWE-125

Which versions are affected by CVE-2018-20615?

It affects 5 products.

Linux distribution packages (7)

`haproxy` Red Hat:openshift:3.10::el7	All versions	`0:1.8.17-3.el7`
`haproxy-debuginfo` Red Hat:openshift:3.10::el7	All versions	`0:1.8.17-3.el7`
`haproxy18` Red Hat:openshift:3.10::el7	All versions	`0:1.8.17-3.el7`
`rh-haproxy18-haproxy` Red Hat:rhel_software_collections:3::el7	All versions	`0:1.8.4-4.el7`
`rh-haproxy18-haproxy-debuginfo` Red Hat:rhel_software_collections:3::el7	All versions	`0:1.8.4-4.el7`
`rh-haproxy18-haproxy-syspaths` Red Hat:rhel_software_collections:3::el7	All versions	`0:1.8.4-4.el7`
`haproxy` SUSE:Linux Enterprise High Availability Extension 15	All versions	`1.8.17~git0.e89d25b2-3.9.1`

Products include Canonical Ubuntu Linux, Haproxy Haproxy, Opensuse Leap, Redhat Enterprise Linux, Redhat Openshift Container Platform.

How do I fix CVE-2018-20615?

Apply the vendor's patch.

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-2018-20615 being exploited?

There is no known exploitation of CVE-2018-20615 in the wild and no public exploit code.

All Canonical Ubuntu Linux vulnerabilities

Sources

Also known as DEBIAN-CVE-2018-20615, GHSA-w4g5-v736-j48g, RHSA-2019:0275, RHSA-2019:0548, SUSE-SU-2019:0232-1, UBUNTU-CVE-2018-20615 and 1 more.