1) Improper Verification of Cryptographic Signature

EUVDB-ID: #VU59993

Risk: Medium

CVSSv3.1: 6.8 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:U/RC:C]

CVE-ID: CVE-2021-3521

CWE-ID: CWE-347 - Improper Verification of Cryptographic Signature

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to an error in RPM's signature functionality, as RPM does not check the binding signature of subkeys before importing them. A remote attacker with ability to add malicious subkey to a legitimate public key can run malicious code on the system.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

rpm: 4.0 - 4.17.0 rc1

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CPE2.3

• cpe:2.3::rpm:rpm:4.17.0:rc1:*:*:*:*:*:*
• Full software list in CPE2.3 format available after registration.

External links

http://github.com/rpm-software-management/rpm/pull/1788
http://bugzilla.redhat.com/show_bug.cgi?id=1941098

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.