Ubuntu update for ruby2.7



Published: 2023-03-20
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-33621
CWE-ID CWE-113
Exploitation vector Network
Public exploit N/A
Vulnerable software
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Ubuntu
Operating systems & Components / Operating system

libruby2.7 (Ubuntu package)
Operating systems & Components / Operating system package or component

ruby2.7 (Ubuntu package)
Operating systems & Components / Operating system package or component

Vendor Canonical Ltd.

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) HTTP response splitting

EUVDB-ID: #VU69506

Risk: Medium

CVSSv3.1: 5.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

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 ruby2.7 to the latest version.

Vulnerable software versions

Ubuntu: 20.04

libruby2.7 (Ubuntu package): before 2.7.0-5ubuntu1.8

ruby2.7 (Ubuntu package): before 2.7.0-5ubuntu1.8

External links

http://ubuntu.com/security/notices/USN-5806-3


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.



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