CVE-2021-3899 Race condition in Apport

What is CVE-2021-3899?

CVE-2021-3899 is a high-severity vulnerability in Canonical Ubuntu Linux, published on 3 Jun 2024. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

There is a race condition in the 'replaced executable' detection that, with the correct local configuration, allow an attacker to execute arbitrary code as root.

Weakness: CWE-367

Which versions are affected by CVE-2021-3899?

It affects 2 products.

Products include Canonical Apport, Canonical Ubuntu Linux.

How do I fix CVE-2021-3899?

Apply the vendor's patch.

Is CVE-2021-3899 being exploited?

There is no known exploitation of CVE-2021-3899 in the wild and no public exploit code.

Public exploit code: 1 proofs of concept on GitHub.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2021-25682 apport improperly parses /proc/pid/status High 8.8
• CVE-2021-25683 apport improperly parses /proc/pid/stat High 8.8
• CVE-2021-25684 apport can be stalled by reading a FIFO High 8.8
• CVE-2022-1242 Other in Apport High 7.8
• CVE-2023-1326 local privilege escalation in apport-cli High 7.7

All Canonical Ubuntu Linux vulnerabilities

Sources

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

Also known as GHSA-m676-gr96-hhhh, UBUNTU-CVE-2021-3899.