CVE-2019-20795 Use after free in n/a

What is CVE-2019-20795?

CVE-2019-20795 is a medium-severity use after free vulnerability in Canonical Ubuntu Linux, published on 9 May 2020. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

iproute2 before 5.1.0 has a use-after-free in get_netnsid_from_name in ip/ipnetns.c. NOTE: security relevance may be limited to certain uses of setuid that, although not a default, are sometimes a configuration option offered to end users. Even when setuid is used, other factors (such as C library configuration) may block exploitability.

Weakness: CWE-416

Which versions are affected by CVE-2019-20795?

It affects 2 products.

Products include Canonical Ubuntu Linux, Iproute2 Project Iproute2.

How do I fix CVE-2019-20795?

Upgrade to a fixed version.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2019-20795 being exploited?

There is no known exploitation of CVE-2019-20795 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-2019-20795, DEBIAN-CVE-2019-20795, GHSA-7x5p-w7r4-hq6m, SUSE-SU-2021:3452-1, UBUNTU-CVE-2019-20795, USN-4357-1.