CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
AI Score
Confidence
Low
EPSS
Percentile
10.3%
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()
.
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
.
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
.
https://github.com/expressjs/express/pull/5539
https://github.com/koajs/koa/issues/1800
https://expressjs.com/en/4x/api.html#res.location
expressjs.com/en/4x/api.html#res.location
github.com/expressjs/express
github.com/expressjs/express/commit/0867302ddbde0e9463d0564fea5861feb708c2dd
github.com/expressjs/express/commit/0b746953c4bd8e377123527db11f9cd866e39f94
github.com/expressjs/express/pull/5539
github.com/expressjs/express/security/advisories/GHSA-rv95-896h-c2vc
github.com/koajs/koa/issues/1800
nvd.nist.gov/vuln/detail/CVE-2024-29041
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
AI Score
Confidence
Low
EPSS
Percentile
10.3%