#VU80344 Inefficient regular expression complexity in Postcss - CVE-2021-23382

Vulnerability identifier: #VU80344

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-2021-23382

CWE-ID: CWE-1333

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Postcss
/

Vendor: Postcss

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 untrusted input with a regular expressions within the getAnnotationURL() and loadAnnotation() functions in lib/previous-map.js. 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

Postcss: 7.0.0 - 8.2.12

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External links
http://github.com/postcss/postcss/commit/2b1d04c867995e55124e0a165b7c6622c1735956
http://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1255641
http://snyk.io/vuln/SNYK-JS-POSTCSS-1255640

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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.