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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().
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.
Workflow status is success ✅
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Link to GitHub workflow: Github Workflow Link
Workflow status is success ✅
Unfortunately test report wasn't generated, it can be if no workspaces changed. Please check the workflow run below.
Link to GitHub workflow: Github Workflow Link
Workflow status is success ✅
Unfortunately test report wasn't generated, it can be if no workspaces changed. Please check the workflow run below.
Link to GitHub workflow: Github Workflow Link
Workflow status is success ✅
Unfortunately test report wasn't generated, it can be if no workspaces changed. Please check the workflow run below.
Link to GitHub workflow: Github Workflow Link
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This PR contains the following updates:
4.18.2->4.19.2Express.js Open Redirect in malformed URLs
CVE-2024-29041 / GHSA-rv95-896h-c2vc
More information
Details
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
encodeurlon the contents before passing it to thelocationheader. 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 withinres.redirect().Patches
expressjs/express@0867302
expressjs/express@0b74695
An initial fix went out with
[email protected], we then patched a feature regression in4.19.1and added improved handling for the bypass in4.19.2.Workarounds
The fix for this involves pre-parsing the url string with either
require('node:url').parseornew URL. These are steps you can take on your own before passing the user input string tores.locationorres.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
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:NReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
Release Notes
expressjs/express (express)
v4.19.2Compare Source
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v4.19.1Compare Source
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v4.19.0Compare Source
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v4.18.3Compare Source
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