#VU59698 Incorrect Regular Expression in prism - CVE-2021-32723

Vulnerability identifier: #VU59698

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-32723

CWE-ID: CWE-185

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
prism
Other software / Other software solutions

Vendor: PrismJS

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

Mitigation
Install update from vendor's website.

Vulnerable software versions

prism: 1.0.0 - 1.23.0

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External links
https://github.com/PrismJS/prism/security/advisories/GHSA-gj77-59wh-66hg
https://github.com/PrismJS/prism/pull/2688
https://github.com/PrismJS/prism/pull/2774

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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.