CVE-2020-3123 Denial of service in ClamAV

What is CVE-2020-3123?

CVE-2020-3123 is a high-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 5 Feb 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in the Data-Loss-Prevention (DLP) module in Clam AntiVirus (ClamAV) Software versions 0.102.1 and 0.102.0 could allow an unauthenticated, remote attacker to cause a denial of service condition on an affected device. The vulnerability is due to an out-of-bounds read affecting users that have enabled the optional DLP feature. An attacker could exploit this vulnerability by sending a crafted email file to an affected device. An exploit could allow the attacker to cause the ClamAV scanning process crash, resulting in a denial of service condition.

Weakness: CWE-125

Which versions are affected by CVE-2020-3123?

It affects 2 products.

Products include Canonical Ubuntu Linux, Clamav Clamav.

How do I fix CVE-2020-3123?

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-2020-3123 being exploited?

There is no known exploitation of CVE-2020-3123 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 ALPINE-CVE-2020-3123, CLEANSTART-2026-HI56120, DEBIAN-CVE-2020-3123, GHSA-x7cm-49hv-4xfc, MGASA-2020-0105, UBUNTU-CVE-2020-3123 and 2 more.