#VU54287 Use of Hard-coded Cryptographic Key in tpm2-tools - CVE-2021-3565

Vulnerability identifier: #VU54287

Vulnerability risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-3565

CWE-ID: CWE-321

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
tpm2-tools
Other software / Other software solutions

Vendor: Linux TPM2 & TSS2 Software

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to usage of a fixed AES key in the tpm2_import function. A remote attacker can perform MitM attack and gain access to sensitive information.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

tpm2-tools: 4.0 - 4.0.1, 4.1 - 4.1.3, 4.2 - 4.2.1, 4.3.0 - 4.3.1, 5.0, 5.1

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External links
https://bugzilla.redhat.com/show_bug.cgi?id=1964427
https://github.com/tpm2-software/tpm2-tools/releases/tag/4.3.2
https://github.com/tpm2-software/tpm2-tools/releases/tag/5.1.1

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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.