Regular expression denial of service in Puppet Server

1) Inefficient regular expression complexity

EUVDB-ID: #VU83504

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-1894

CWE-ID: CWE-1333 - Inefficient Regular Expression Complexity

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient input validation when processing untrusted input with a regular expressions. A remote attacker can pass specially crafted data to the application and perform regular expression denial of service (ReDos) attack.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability..

Vulnerable software versions

Puppet Server: 7.0.0 - 7.10.0

Puppet Enterprise: 2021.1.0 - 2023.0.0

CPE2.3

• cpe:2.3:a:puppet_labs:puppet_server:7.10.0:*:*:*:*:*:*:*
• cpe:2.3:a:puppet_labs:puppet_enterprise:2023.0.0:*:*:*:*:*:*:*

External links

https://www.puppet.com/security/cve/cve-2023-1894-puppet-server-redos

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.