GHSA-wxhq-pm8v-cw75 Regular Expression Denial of Service in clean-css
Untrusted input triggers catastrophic backtracking in clean-css, causing application unresponsiveness and denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is GHSA-wxhq-pm8v-cw75?
GHSA-wxhq-pm8v-cw75 is a denial of service vulnerability in clean-css, published on 5 Jun 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Version of clean-css prior to 4.1.11 are vulnerable to Regular Expression Denial of Service (ReDoS). Untrusted input may cause catastrophic backtracking while matching regular expressions. This can cause the application to be unresponsive leading to Denial of Service.
Recommendation
Upgrade to version 4.1.11 or higher.
Which versions are affected by GHSA-wxhq-pm8v-cw75?
2 open source packages ship an affected version, including clean-css.
| Package | Affected | Fixed in |
|---|---|---|
clean-css npm | All versions | 4.1.11 |
clean-css npm | All versions | 4.1.11 |
How do I fix GHSA-wxhq-pm8v-cw75?
Upgrade clean-css to 4.1.11 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is GHSA-wxhq-pm8v-cw75 being exploited?
There is no known exploitation of GHSA-wxhq-pm8v-cw75 in the wild and no public exploit code.