Ecosyste.ms: Advisories

An open API service providing security vulnerability metadata for many open source software ecosystems.

Security Advisories: GSA_kwCzR0hTQS1ydjk1LTg5NmgtYzJ2Y84AA6Rd

Express.js Open Redirect in malformed URLs

Impact

Versions of Express.js prior to 4.19.2 and pre-release alpha and beta versions before 5.0.0-beta.3 are affected by an open redirect vulnerability using malformed URLs.

When a user of Express performs a redirect using a user-provided URL Express performs an encode using encodeurl on the contents before passing it to the location header. This can cause malformed URLs to be evaluated in unexpected ways by common redirect allow list implementations in Express applications, leading to an Open Redirect via bypass of a properly implemented allow list.

The main method impacted is res.location() but this is also called from within res.redirect().

Patches

https://github.com/expressjs/express/commit/0867302ddbde0e9463d0564fea5861feb708c2dd
https://github.com/expressjs/express/commit/0b746953c4bd8e377123527db11f9cd866e39f94

An initial fix went out with [email protected], we then patched a feature regression in 4.19.1 and added improved handling for the bypass in 4.19.2.

Workarounds

The fix for this involves pre-parsing the url string with either require('node:url').parse or new URL. These are steps you can take on your own before passing the user input string to res.location or res.redirect.

References

https://github.com/expressjs/express/pull/5539
https://github.com/koajs/koa/issues/1800
https://expressjs.com/en/4x/api.html#res.location

Permalink: https://github.com/advisories/GHSA-rv95-896h-c2vc
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1ydjk1LTg5NmgtYzJ2Y84AA6Rd
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: about 1 month ago
Updated: about 1 month ago


CVSS Score: 6.1
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Identifiers: GHSA-rv95-896h-c2vc, CVE-2024-29041
References: Repository: https://github.com/expressjs/express
Blast Radius: 38.2

Affected Packages

npm:express
Dependent packages: 93,237
Dependent repositories: 1,853,938
Downloads: 121,503,545 last month
Affected Version Ranges: >= 5.0.0-alpha.1, < 5.0.0-beta.3, < 4.19.2
Fixed in: 5.0.0-beta.3, 4.19.2
All affected versions: 0.14.0, 0.14.1, 1.0.0, 1.0.1, 1.0.2, 1.0.3, 1.0.4, 1.0.5, 1.0.6, 1.0.7, 1.0.8, 2.0.0, 2.1.0, 2.1.1, 2.2.0, 2.2.1, 2.2.2, 2.3.0, 2.3.1, 2.3.2, 2.3.3, 2.3.4, 2.3.5, 2.3.6, 2.3.7, 2.3.8, 2.3.9, 2.3.10, 2.3.11, 2.3.12, 2.4.0, 2.4.1, 2.4.2, 2.4.3, 2.4.4, 2.4.5, 2.4.6, 2.4.7, 2.5.0, 2.5.1, 2.5.2, 2.5.3, 2.5.4, 2.5.5, 2.5.6, 2.5.7, 2.5.8, 2.5.9, 2.5.10, 2.5.11, 3.0.0, 3.0.1, 3.0.2, 3.0.3, 3.0.4, 3.0.5, 3.0.6, 3.1.0, 3.1.1, 3.1.2, 3.2.0, 3.2.1, 3.2.2, 3.2.3, 3.2.4, 3.2.5, 3.2.6, 3.3.0, 3.3.1, 3.3.2, 3.3.3, 3.3.4, 3.3.5, 3.3.6, 3.3.7, 3.3.8, 3.4.0, 3.4.1, 3.4.2, 3.4.3, 3.4.4, 3.4.5, 3.4.6, 3.4.7, 3.4.8, 3.5.0, 3.5.1, 3.5.2, 3.5.3, 3.6.0, 3.7.0, 3.8.0, 3.8.1, 3.9.0, 3.10.0, 3.10.1, 3.10.2, 3.10.3, 3.10.4, 3.10.5, 3.11.0, 3.12.0, 3.12.1, 3.13.0, 3.14.0, 3.15.0, 3.15.1, 3.15.2, 3.15.3, 3.16.0, 3.16.1, 3.16.2, 3.16.3, 3.16.4, 3.16.5, 3.16.6, 3.16.7, 3.16.8, 3.16.9, 3.16.10, 3.17.0, 3.17.1, 3.17.2, 3.17.3, 3.17.4, 3.17.5, 3.17.6, 3.17.7, 3.17.8, 3.18.0, 3.18.1, 3.18.2, 3.18.3, 3.18.4, 3.18.5, 3.18.6, 3.19.0, 3.19.1, 3.19.2, 3.20.0, 3.20.1, 3.20.2, 3.20.3, 3.21.0, 3.21.1, 3.21.2, 4.0.0, 4.1.0, 4.1.1, 4.1.2, 4.2.0, 4.3.0, 4.3.1, 4.3.2, 4.4.0, 4.4.1, 4.4.2, 4.4.3, 4.4.4, 4.4.5, 4.5.0, 4.5.1, 4.6.0, 4.6.1, 4.7.0, 4.7.1, 4.7.2, 4.7.3, 4.7.4, 4.8.0, 4.8.1, 4.8.2, 4.8.3, 4.8.4, 4.8.5, 4.8.6, 4.8.7, 4.8.8, 4.9.0, 4.9.1, 4.9.2, 4.9.3, 4.9.4, 4.9.5, 4.9.6, 4.9.7, 4.9.8, 4.10.0, 4.10.1, 4.10.2, 4.10.3, 4.10.4, 4.10.5, 4.10.6, 4.10.7, 4.10.8, 4.11.0, 4.11.1, 4.11.2, 4.12.0, 4.12.1, 4.12.2, 4.12.3, 4.12.4, 4.13.0, 4.13.1, 4.13.2, 4.13.3, 4.13.4, 4.14.0, 4.14.1, 4.15.0, 4.15.1, 4.15.2, 4.15.3, 4.15.4, 4.15.5, 4.16.0, 4.16.1, 4.16.2, 4.16.3, 4.16.4, 4.17.0, 4.17.1, 4.17.2, 4.17.3, 4.18.0, 4.18.1, 4.18.2, 4.18.3, 4.19.0, 4.19.1, 5.0.0-alpha.1, 5.0.0-alpha.2, 5.0.0-alpha.3, 5.0.0-alpha.4, 5.0.0-alpha.5, 5.0.0-alpha.6, 5.0.0-alpha.7, 5.0.0-alpha.8, 5.0.0-beta.1, 5.0.0-beta.2
All unaffected versions: 4.19.2