CVE Vulnerability

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.

4.7 /10

CVSS v3.0 : MEDIUM

V3 Legend

Vector :

Exploitability : 1 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity HIGH

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://access.redhat.com/security/cve/CVE-2021-3521 Third Party Advisory
https://github.com/rpm-software-management/rpm/pull/1795/ Patch Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1941098 Issue Tracking Patch
https://github.com/rpm-software-management/rpm/commit/bd36c5dc9fb6d90c46fbfed8c2d67516fc571ec8 Patch Third Party Advisory
https://security.gentoo.org/glsa/202210-22 Third Party Advisory
Configurations

Configuration 1

cpe:2.3:a:rpm:rpm:*:*:*:*:*:*:*:*
Information

Published : 2022-08-22 03:15

Updated : 2023-02-12 11:41

NVD link : CVE-2021-3521

Mitre link : CVE-2021-3521

Products Affected
No products.
CWE
CWE-347

Improper Verification of Cryptographic Signature