Vulnerability Description
Pug is an npm package which is a high-performance template engine. In pug before version 3.0.1, if a remote attacker was able to control the `pretty` option of the pug compiler, e.g. if you spread a user provided object such as the query parameters of a request into the pug template inputs, it was possible for them to achieve remote code execution on the node.js backend. This is fixed in version 3.0.1. This advisory applies to multiple pug packages including "pug", "pug-code-gen". pug-code-gen has a backported fix at version 2.0.3. This advisory is not exploitable if there is no way for un-trusted input to be passed to pug as the `pretty` option, e.g. if you compile templates in advance before applying user input to them, you do not need to upgrade.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Pugjs | Pug | < 3.0.1 |
| Pugjs | Pug-Code-Gen | < 2.0.3 |
Related Weaknesses (CWE)
References
- https://github.com/pugjs/pug/commit/991e78f7c4220b2f8da042877c6f0ef5a4683be0PatchThird Party Advisory
- https://github.com/pugjs/pug/issues/3312ExploitPatchThird Party Advisory
- https://github.com/pugjs/pug/pull/3314PatchThird Party Advisory
- https://github.com/pugjs/pug/releases/tag/pug%403.0.1Release NotesThird Party Advisory
- https://github.com/pugjs/pug/security/advisories/GHSA-p493-635q-r6grThird Party Advisory
- https://www.npmjs.com/package/pugProductThird Party Advisory
- https://www.npmjs.com/package/pug-code-genProductThird Party Advisory
- https://github.com/pugjs/pug/commit/991e78f7c4220b2f8da042877c6f0ef5a4683be0PatchThird Party Advisory
- https://github.com/pugjs/pug/issues/3312ExploitPatchThird Party Advisory
- https://github.com/pugjs/pug/pull/3314PatchThird Party Advisory
- https://github.com/pugjs/pug/releases/tag/pug%403.0.1Release NotesThird Party Advisory
- https://github.com/pugjs/pug/security/advisories/GHSA-p493-635q-r6grThird Party Advisory
- https://www.npmjs.com/package/pugProductThird Party Advisory
- https://www.npmjs.com/package/pug-code-genProductThird Party Advisory
FAQ
What is CVE-2021-21353?
CVE-2021-21353 is a vulnerability with a CVSS score of 6.8 (MEDIUM). Pug is an npm package which is a high-performance template engine. In pug before version 3.0.1, if a remote attacker was able to control the `pretty` option of the pug compiler, e.g. if you spread a ...
How severe is CVE-2021-21353?
CVE-2021-21353 has been rated MEDIUM with a CVSS base score of 6.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-21353?
Check the references section above for vendor advisories and patch information. Affected products include: Pugjs Pug, Pugjs Pug-Code-Gen.