[12] express vulnerable to XSS via response.redirect() #369

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opened 2024-09-23 18:37:15 +01:00 by Helpdesk · 0 comments

Helpdesk commented

2024-09-23 18:37:15 +01:00

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Package: express (npm)
Affected versions: < 4.20.0
Patched version: 4.20.0

Impact

In express <4.20.0, passing untrusted user input - even after sanitizing it - to response.redirect() may execute untrusted code

Patches

this issue is patched in express 4.20.0

Workarounds

users are encouraged to upgrade to the patched version of express, but otherwise can workaround this issue by making sure any untrusted inputs are safe, ideally by validating them against an explicit allowlist
Details

successful exploitation of this vector requires the following:

The attacker MUST control the input to response.
express MUST NOT redirect before the template appears
the browser MUST NOT complete redirection
the user MUST click on the link in the template

Package: express (npm) Affected versions: < 4.20.0 Patched version: 4.20.0 --- ## Impact In express <4.20.0, passing untrusted user input - even after sanitizing it - to `response.redirect()` may execute untrusted code ## Patches this issue is patched in express 4.20.0 ## Workarounds users are encouraged to upgrade to the patched version of express, but otherwise can workaround this issue by making sure any untrusted inputs are safe, ideally by validating them against an explicit allowlist Details successful exploitation of this vector requires the following: 1. The attacker MUST control the input to response. 2. express MUST NOT redirect before the template appears 3. the browser MUST NOT complete redirection 4. the user MUST click on the link in the template