The package css-what before 2.1.3 are vulnerable to Regular Expression Denial of Service (ReDoS) due to the usage of insecure regular expression in the re_attr variable of index.js. The exploitation of this vulnerability could be triggered via the parse function.
Weakness
The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Css-what | Css-what_project | * | 2.1.3 (excluding) |
| Node-css-what | Ubuntu | bionic | * |
| Node-css-what | Ubuntu | esm-apps/bionic | * |
| Node-css-what | Ubuntu | esm-apps/focal | * |
| Node-css-what | Ubuntu | esm-apps/xenial | * |
| Node-css-what | Ubuntu | focal | * |
| Node-css-what | Ubuntu | mantic | * |
| Node-css-what | Ubuntu | oracular | * |
| Node-css-what | Ubuntu | plucky | * |
| Node-css-what | Ubuntu | trusty | * |
| Node-css-what | Ubuntu | xenial | * |
Extended Description
Attackers can create crafted inputs that
intentionally cause the regular expression to use
excessive backtracking in a way that causes the CPU
consumption to spike.
Potential Mitigations
Related Attack Patterns
References
- https://github.com/fb55/css-what/blob/a38effd5a8f5506d75c7f8f13cbd8c76248a3860/index.js%23L12
- https://lists.debian.org/debian-lts-announce/2023/03/msg00001.html
- https://security.snyk.io/vuln/SNYK-JS-CSSWHAT-3035488
- https://github.com/fb55/css-what/blob/a38effd5a8f5506d75c7f8f13cbd8c76248a3860/index.js%23L12
- https://lists.debian.org/debian-lts-announce/2023/03/msg00001.html
- https://security.snyk.io/vuln/SNYK-JS-CSSWHAT-3035488