CVE-2024-29041: express Open Redirect — Fix

Description

Express.js minimalist web framework for node. Versions of Express.js prior to 4.19.0 and all pre-release alpha and beta versions of 5.0 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`](https://github.com/pillarjs/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()`. The vulnerability is fixed in 4.19.2 and 5.0.0-beta.3.

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CVSS v3.1 Score

6.1

MEDIUM

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

Weakness Type (CWE)

CWE-601 CWE-601

CWE-1286 CWE-1286

Affected Products

Vendor	Product	Versions
openjsf	express	< 4.19.2
openjsf	express	All
openjsf	express	All
openjsf	express	All
openjsf	express	All
openjsf	express	All
openjsf	express	All
openjsf	express	All
openjsf	express	All
openjsf	express	All
openjsf	express	All

References

Advisories & Patches

https://github.com/expressjs/express/commit/0867302ddbde0e9463d0564fea5861feb708c2dd https://github.com/expressjs/express/commit/0b746953c4bd8e377123527db11f9cd866e39f94 https://github.com/expressjs/express/security/advisories/GHSA-rv95-896h-c2vc https://github.com/expressjs/express/commit/0867302ddbde0e9463d0564fea5861feb708c2dd https://github.com/expressjs/express/commit/0b746953c4bd8e377123527db11f9cd866e39f94 https://github.com/expressjs/express/security/advisories/GHSA-rv95-896h-c2vc

Other References

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

Frequently Asked Questions

What is CVE-2024-29041? +

Express.js minimalist web framework for node. Versions of Express.js prior to 4.19.0 and all pre-release alpha and beta versions of 5.0 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`](https://github.com/pillarjs/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()`. The vulnerability is fixed in 4.19.2 and 5.0.0-beta.3. It has a CVSS v3.1 base score of 6.1 (MEDIUM).

How severe is CVE-2024-29041? +

CVE-2024-29041 has a CVSS v3.1 score of 6.1 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2024-29041? +

CVE-2024-29041 affects products from openjsf, specifically: express. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-29041? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2024-29041