CVE-2021-3521

 

Published at: - 22-08-2022 05:15

Last modified: - 12-09-2022 04:12

Total changes: - 3

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.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N

 

Verification logic

 

Reference

• https://access.redhat.com/security/cve/CVE-2021-3521
• https://github.com/rpm-software-management/rpm/pull/1795/
• https://bugzilla.redhat.com/show_bug.cgi?id=1941098
• https://github.com/rpm-software-management/rpm/commit/bd36c5dc9fb6d90c46fbfed8c2d67516fc571ec8

 

Keywords

NVD

 

CVE-2021-3521

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures