Improper Verification of Cryptographic Signature Affecting rpm-libs package, versions <0:4.14.3-19.el8_5.2


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.07% (33rd percentile)

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  • Snyk IDSNYK-RHEL8-RPMLIBS-4197440
  • published30 Sept 2021
  • disclosed28 Sept 2021

Introduced: 28 Sep 2021

CVE-2021-3521  (opens in a new tab)
CWE-347  (opens in a new tab)

How to fix?

Upgrade RHEL:8 rpm-libs to version 0:4.14.3-19.el8_5.2 or higher.
This issue was patched in RHSA-2022:0368.

NVD Description

Note: Versions mentioned in the description apply only to the upstream rpm-libs package and not the rpm-libs package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

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.

CVSS Scores

version 3.1