Critical severityNVD Advisory· Published Mar 2, 2021· Updated Aug 3, 2024
Prefix escape
CVE-2021-21321
Description
fastify-reply-from is an npm package which is a fastify plugin to forward the current http request to another server. In fastify-reply-from before version 4.0.2, by crafting a specific URL, it is possible to escape the prefix of the proxied backend service. If the base url of the proxied server is "/pub/", a user expect that accessing "/priv" on the target service would not be possible. In affected versions, it is possible. This is fixed in version 4.0.2.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
fastify-reply-fromnpm | < 4.0.2 | 4.0.2 |
Affected products
2- Range: < 4.0.2
Patches
Vulnerability mechanics
References
5- github.com/advisories/GHSA-qmw8-3v4g-gwj4ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2021-21321ghsaADVISORY
- github.com/fastify/fastify-reply-from/commit/dea227dda606900cc01870d08541b4dcc69d3889ghsax_refsource_MISCWEB
- github.com/fastify/fastify-reply-from/security/advisories/GHSA-qmw8-3v4g-gwj4ghsax_refsource_CONFIRMWEB
- www.npmjs.com/package/fastify-reply-fromghsax_refsource_MISCWEB
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