Padding Oracle in HashiCorp Vault Enterprise

1) Use of a broken or risky cryptographic algorithm

EUVDB-ID: #VU75638

Risk: Medium

CVSSv3.1: 4.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-2197

CWE-ID: CWE-327 - Use of a Broken or Risky Cryptographic Algorithm

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform MitM attack.

The vulnerability exists due to Vault HSM integration configurations do not properly applying an HMAC to messages sent from the HSM when using a CBC-based encryption mechanism. A remote attacker can perform a padding oracle attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Vault Enterprise: 1.13.0 - 1.13.1

External links

http://discuss.hashicorp.com/t/hcsec-2023-14-vault-enterprise-vulnerable-to-padding-oracle-attacks-when-using-a-cbc-based-encryption-mechanism-with-a-hsm/53322

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.