CVE-2021-33643 Memory corruption in libtar

What is CVE-2021-33643?

CVE-2021-33643 is a medium-severity memory corruption vulnerability in Fedoraproject Fedora, published on 9 Aug 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An attacker who submits a crafted tar file with size in header struct being 0 may be able to trigger an calling of malloc(0) for a variable gnu_longlink, causing an out-of-bounds read.

Weakness: CWE-125

Which versions are affected by CVE-2021-33643?

It affects 3 products.

Products include Fedoraproject Fedora, Feep Libtar, Openatom Openeuler.

How do I fix CVE-2021-33643?

Apply the vendor's patch.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2021-33643 being exploited?

There is no known exploitation of CVE-2021-33643 in the wild and no public exploit code.

Other vulnerabilities in Fedoraproject Fedora

• CVE-2024-4577 PHP-CGI OS Command Injection Exploited Critical 9.8
• CVE-2021-39226 Grafana Authentication Bypass Exploited Critical 9.8
• CVE-2019-5544 VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow Exploited Critical 9.8
• CVE-2024-4947 Google Chromium V8 Type Confusion Exploited Critical 9.6
• CVE-2024-4671 Google Chromium Visuals Use-After-Free Exploited Critical 9.6

All Fedoraproject Fedora vulnerabilities

Sources

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

Also known as AZL-10542, AZL-34946, DEBIAN-CVE-2021-33643, GHSA-j7g9-fcw9-wxcf, UBUNTU-CVE-2021-33643.