#VU75786 Incorrect regular expression in rails-html-sanitizer - CVE-2022-23517

Vulnerability identifier: #VU75786

Vulnerability risk: Medium

CVSSv4.0: 6.6 [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:U/U:Green]

CVE-ID: CVE-2022-23517

CWE-ID: CWE-185

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
rails-html-sanitizer
Universal components / Libraries / Programming Languages & Components

Vendor: Rails

Description

The vulnerability allows a remote attacker to perform DoS attack.

The vulnerability exists due to usage of an incorrect regular expression to parse SVG attributes. A remote attacker can pass a specially crafted SVG image to the application and consume excessive CPU resources.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

rails-html-sanitizer: 1.4.0 - 1.4.3

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External links
https://hackerone.com/reports/1684163
https://github.com/rails/rails-html-sanitizer/security/advisories/GHSA-5x79-w82f-gw8w
https://github.com/rails/rails-html-sanitizer/commit/56c61c0cebd1e493e8ad7bca2a0191609a4a6979

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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.