CVE-2021-42575 Policies not properly enforced in OWASP Java HTML Sanitizer
The OWASP Java HTML Sanitizer fails to enforce policies for SELECT, STYLE, and OPTION elements, allowing attackers to inject malicious scripts.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-42575?
CVE-2021-42575 is a critical cross-site scripting vulnerability in Oracle Primavera Unifier, published on 18 Oct 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The OWASP Java HTML Sanitizer before 20211018.1 does not properly enforce policies associated with the SELECT, STYLE, and OPTION elements.
Which versions are affected by CVE-2021-42575?
2 open source packages ship an affected version, including com.googlecode.owasp-java-html-sanitizer:owasp-java-html-sanitizer. It affects 3 products.
| Package | Affected | Fixed in |
|---|---|---|
com.googlecode.owasp-java-html-sanitizer:owasp-java-html-sanitizer Maven | All versions | 20211018.1 |
com.googlecode.owasp-java-html-sanitizer:owasp-java-html-sanitizer Maven | All versions | 20211018.1 |
Products include Oracle Middleware Common Libraries and Tools, Oracle Primavera Unifier, Owasp Java Html Sanitizer.
How do I fix CVE-2021-42575?
Upgrade com.googlecode.owasp-java-html-sanitizer:owasp-java-html-sanitizer to 20211018.1 or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2021-42575 being exploited?
There is no known exploitation of CVE-2021-42575 in the wild and no public exploit code.
Sources
Also known as GHSA-3w73-fmf3-hg5c.