MEDIUM 4.7 Microsoft

CVE-2021-3521

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.

Microsoft Security Update 2022-Aug: 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.

Affected Products

References

Published: 2022-08-09 · Source: Microsoft · Feed updated: 2026-09-03
This medium severity vulnerability with a CVSS score of 4.7 was published on 2022-08-09 via Microsoft. Affected: cm1 rpm 4.14.2-15 on CBL Mariner 1.0, cbl2 rpm 4.18.0-1 on CBL Mariner 2.0.
vulnfeed aggregates 9119 vulnerabilities from NVD, CISA KEV, Ubuntu, Debian, Red Hat, Kubernetes, Exploit-DB, OSS-Security, GitHub and OpenStack — updated every 4 hours.