CVE-2021-33646 Denial of service in libtar

What is CVE-2021-33646?

CVE-2021-33646 is a high-severity denial of service 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

The th_read() function doesn’t free a variable t->th_buf.gnu_longname after allocating memory, which may cause a memory leak.

Weakness: CWE-401

Which versions are affected by CVE-2021-33646?

It affects 3 products.

Products include Fedoraproject Fedora, Feep Libtar, Openatom Openeuler.

How do I fix CVE-2021-33646?

Apply the vendor's patch.

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-2021-33646 being exploited?

There is no known exploitation of CVE-2021-33646 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-10545, AZL-34949, DEBIAN-CVE-2021-33646, GHSA-x27v-rjqh-f4xc, UBUNTU-CVE-2021-33646.