Insufficient session expiration in HashiCorp Vault

1) Insufficient Session Expiration

EUVDB-ID: #VU66113

Risk: Medium

CVSSv3.1: 6.4 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-32923

CWE-ID: CWE-613 - Insufficient Session Expiration

Exploit availability: No

Description

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

The vulnerability exists due to application allows the renewal of nearly-expired token leases and dynamic secret leases (specifically, those within 1 second of their maximum TTL), which caused them to be incorrectly treated as non-expiring during subsequent use. A remote non-authenticated attacker can obtain or guess session token and gain unauthorized access to session that belongs to another user.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Vault: 1.5.0 - 1.7.1

Vault Enterprise: 1.5.0 - 1.7.1

External links

http://www.hashicorp.com/blog/category/vault/
http://discuss.hashicorp.com/t/hcsec-2021-15-vault-renewed-nearly-expired-leases-with-incorrect-non-expiring-ttls/24603

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.