Fedora 37 update for tang

1) Race condition

EUVDB-ID: #VU77575

Risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-1672

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Exploit availability: No

Description

The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists due to a race condition in the Tang server functionality for key generation and key rotation, which results in a small time window where Tang server private keys become readable by any other process on the same host. The files are initially created with world readable permissions (0644), and only subsequently have more restrictive permissions applied (0440). A local user can exploit the race and obtain Tang private keys.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 37

tang: before 14-1.fc37

CPE2.3

• cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:*
• cpe:2.3:a:fedoraproject:tang:*:*:*:*:*:fedora:*:*

External links

https://bodhi.fedoraproject.org/updates/FEDORA-2023-eb9bec6e8c

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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