CVE-2018-20103 Denial of service in n/a

What is CVE-2018-20103?

CVE-2018-20103 is a high-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 12 Dec 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An issue was discovered in dns.c in HAProxy through 1.8.14. In the case of a compressed pointer, a crafted packet can trigger infinite recursion by making the pointer point to itself, or create a long chain of valid pointers resulting in stack exhaustion.

Weakness: CWE-835

Which versions are affected by CVE-2018-20103?

It affects 3 products.

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

How do I fix CVE-2018-20103?

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-2018-20103 being exploited?

There is no known exploitation of CVE-2018-20103 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-2018-20103, GHSA-c9xx-94cr-x7xm, UBUNTU-CVE-2018-20103.