Ubuntu update for ruby2.5

1) HTTP response splitting

EUVDB-ID: #VU69506

Risk: Medium

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-33621

CWE-ID: CWE-113 - Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting')

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform HTTP splitting attacks.

The vulnerability exists due to software does not corrector process CRLF character sequences when handling cookies. A remote attacker can send specially crafted request containing CRLF sequence and make the application to send a split HTTP response.

Successful exploitation of the vulnerability may allow an attacker perform cache poisoning attack.

Mitigation

Update the affected package ruby2.5 to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 22.10

libruby2.5 (Ubuntu package): before 2.5.1-1ubuntu1.13

ruby2.5 (Ubuntu package): before 2.5.1-1ubuntu1.13

libruby3.0 (Ubuntu package): before 3.0.2-7ubuntu2.3

ruby3.0 (Ubuntu package): before 3.0.2-7ubuntu2.3

CPE2.3

• cpe:2.3:o:canonical:ubuntu:18.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:22.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:22.10:*:*:*:*:*:*:*
• cpe:2.3:a:canonical:libruby2.5_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:ruby2.5_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3::canonical:libruby3.0_ubuntu_package:*:*:*:*:*:*:*:*
• cpe:2.3::canonical:ruby3.0_ubuntu_package:*:*:*:*:*:*:*:*

External links

https://ubuntu.com/security/notices/USN-5806-2

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.