CVE-2021-3521

medium

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.

References

https://security.gentoo.org/glsa/202210-22

https://github.com/rpm-software-management/rpm/pull/1795/

https://github.com/rpm-software-management/rpm/commit/bd36c5dc9fb6d90c46fbfed8c2d67516fc571ec8

https://bugzilla.redhat.com/show_bug.cgi?id=1941098

https://access.redhat.com/security/cve/CVE-2021-3521

Details

Source: Mitre, NVD

Published: 2022-08-22

Updated: 2023-02-12

Risk Information

CVSS v2

Base Score: 4

Vector: CVSS2#AV:L/AC:H/Au:N/C:N/I:C/A:N

Severity: Medium

CVSS v3

Base Score: 4.7

Vector: CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N

Severity: Medium