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CVE-2021-3521

4.7 · MEDIUM

There is a flaw in RPM's signature functionality.

Published Aug 22, 2022CWE-347EPSS 0.33%

Overview

CVE-2021-3521 is a medium-severity vulnerability. It was published on August 22, 2022 and has a CVSS 3.1 base score of 4.7 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.7, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

There is a flaw in RPM's signature functionality. OpenPGP subkeys are associated with a primary key via a "binding signature." RPM does not check the binding signature of subkeys prior to importing them. If an attacker is able to add or socially engineer another party to add a malicious subkey to a legitimate public key, RPM could wrongly trust a malicious signature. The greatest impact of this flaw is to data integrity. To exploit this flaw, an attacker must either compromise an RPM repository or convince an administrator to install an untrusted RPM or public key. It is strongly recommended to only use RPMs and public keys from trusted sources.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refaccess.redhat.com/security/cve/CVE-2021-3521Refbugzilla.redhat.com/show_bug.cgi?id=1941098GitHubgithub.com/rpm-software-management/rpm/commit/bd36c5dc9fb6d90c46fbfed8c2d67516fc571ec8GitHubgithub.com/rpm-software-management/rpm/pull/1795/Refsecurity.gentoo.org/glsa/202210-22Refaccess.redhat.com/security/cve/CVE-2021-3521Refbugzilla.redhat.com/show_bug.cgi?id=1941098GitHubgithub.com/rpm-software-management/rpm/commit/bd36c5dc9fb6d90c46fbfed8c2d67516fc571ec8GitHubgithub.com/rpm-software-management/rpm/pull/1795/Refsecurity.gentoo.org/glsa/202210-22

How CyberStrike helps

Frequently asked questions

What is CVE-2021-3521?

CVE-2021-3521 is a medium-severity vulnerability. It was published on August 22, 2022 and has a CVSS 3.1 base score of 4.7 (MEDIUM).

How severe is CVE-2021-3521?

This vulnerability has a CVSS 3.1 base score of 4.7, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-3521?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-3521?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-3521 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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