#VU54480 Improper Verification of Cryptographic Signature in libdnf - CVE-2021-3445

Vulnerability identifier: #VU54480

Vulnerability risk: Medium

CVSSv4.0: 4.8 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-3445

CWE-ID: CWE-347

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
libdnf
Universal components / Libraries / Libraries used by multiple products

Vendor: rpm-software-management

Description

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

The vulnerability exists due to insufficient verification of cryptographic signature in libdnf. A remote attacker can create a specially crafted RPM package with altered header information, trick the victim into installing it and compromise the affected system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

libdnf: 0.7.0 - 0.60.0

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External links
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/G4NL7TNWAHJ6JVRABQUPWHKKCTHUZMNF/
https://bugzilla.redhat.com/show_bug.cgi?id=1932079
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DPMFGGQ5T6WVFTFX3OKMVTTM5O4EXWZR/

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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.