CVE-2021-21267 Regular Expression Denial-of-Service in npm schema-inspector
An attacker can cause a denial of service by providing a specially crafted email address to the schema-inspector library, freezing the application.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-21267?
CVE-2021-21267 is a high-severity denial of service vulnerability in Netapp E-Series Performance Analyzer, published on 19 Mar 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Schema-Inspector is an open-source tool to sanitize and validate JS objects (npm package schema-inspector). In before version 2.0.0, email address validation is vulnerable to a denial-of-service attack where some input (for example `a@0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.`) will freeze the program or web browser page executing the code. This affects any current schema-inspector users using any version to validate email addresses. Users who do not do email validation, and instead do other types of validation (like string min or max length, etc), are not affected. Users should upgrade to version 2.0.0, which uses a regex expression that isn't vulnerable to ReDoS.
Which versions are affected by CVE-2021-21267?
2 open source packages ship an affected version, including schema-inspector. It affects 3 products.
| Package | Affected | Fixed in |
|---|---|---|
schema-inspector npm | All versions | 2.0.0 |
schema-inspector npm | All versions | 2.0.0 |
Products include Netapp E-Series Performance Analyzer, Netapp Oncommand Insight, Schema-Inspector Project Schema-Inspector.
How do I fix CVE-2021-21267?
Upgrade schema-inspector to 2.0.0 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 CVE-2021-21267 being exploited?
There is no known exploitation of CVE-2021-21267 in the wild and no public exploit code.
Other vulnerabilities in Netapp E-Series Performance Analyzer
Sources
Also known as GHSA-f38p-c2gq-4pmr.