Denial of service in Date gem for Ruby



Published: 2022-01-19
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-41817
CWE-ID CWE-185
Exploitation vector Network
Public exploit N/A
Vulnerable software
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Date
Web applications / Modules and components for CMS

Vendor Ruby

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Incorrect Regular Expression

EUVDB-ID: #VU59824

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-41817

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 regular expressions on date parsing methods. 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

Date: 2.0.0 - 3.2.0

External links

http://hackerone.com/reports/1254844
http://www.ruby-lang.org/en/news/2021/11/15/date-parsing-method-regexp-dos-cve-2021-41817/


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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