Regular expression denial of service in postcss

1) Inefficient regular expression complexity

EUVDB-ID: #VU80344

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-23382

CWE-ID: CWE-1333 - Inefficient Regular Expression Complexity

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 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

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

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.