Ubuntu update for ruby2.3

1) Incorrect Regular Expression

EUVDB-ID: #VU74004

Risk: Medium

CVSSv4.0: 7.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2023-28755

CWE-ID: CWE-185 - Incorrect Regular Expression

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 URLs. A remote attacker can pass specially crafted URL to the application and perform regular expression denial of service (ReDos) attack.

Mitigation

Update the affected package ruby2.3 to the latest version.

Vulnerable software versions

Ubuntu: 16.04 - 20.04

libruby2.5 (Ubuntu package): before 2.5.1-1ubuntu1.15

ruby2.5 (Ubuntu package): before 2.5.1-1ubuntu1.15

libruby2.7 (Ubuntu package): before 2.7.0-5ubuntu1.10

ruby2.7 (Ubuntu package): before 2.7.0-5ubuntu1.10

ruby2.3 (Ubuntu package): before Ubuntu Pro (Infra-only)

libruby2.3 (Ubuntu package): before Ubuntu Pro (Infra-only)

CPE2.3

• cpe:2.3:o:canonical:ubuntu:16.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:18.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:20.04:*:*:*:*:*:*:*
• cpe:2.3:a:canonical:libruby2.5_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:ruby2.5_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:libruby2.7:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:ruby2.7_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:ruby23_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:libruby2.3_ubuntu_package:*:*:*:*:*:ubuntu:*:*

External links

https://ubuntu.com/security/notices/USN-6055-2

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. However, proof of concept for this vulnerability is available.