CVE-2021-3446 Weak cryptography in libtpms

What is CVE-2021-3446?

CVE-2021-3446 is a medium-severity vulnerability in Fedoraproject Fedora, published on 25 Mar 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A flaw was found in libtpms in versions before 0.8.2. The commonly used integration of libtpms with OpenSSL contained a vulnerability related to the returned IV (initialization vector) when certain symmetric ciphers were used. Instead of returning the last IV it returned the initial IV to the caller, thus weakening the subsequent encryption and decryption steps. The highest threat from this vulnerability is to data confidentiality.

Weakness: CWE-330, CWE-327

Which versions are affected by CVE-2021-3446?

It affects 3 products.

Products include Fedoraproject Fedora, Libtpms Project Libtpms, Redhat Enterprise Linux.

How do I fix CVE-2021-3446?

Upgrade to a fixed version.

Is CVE-2021-3446 being exploited?

There is no known exploitation of CVE-2021-3446 in the wild and no public exploit code.

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• CVE-2024-4947 Google Chromium V8 Type Confusion Exploited Critical 9.6
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All Fedoraproject Fedora vulnerabilities

Sources

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

Also known as DEBIAN-CVE-2021-3446, GHSA-3cfm-94xc-h7hp.