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.redirect()
express MUST NOT redirect before the template appears
the browser MUST NOT complete redirection before:
the user MUST click on the link in the template
Release Notes
expressjs/express (express)
### [`v4.20.0`](https://redirect.github.com/expressjs/express/blob/HEAD/History.md#4200--2024-09-10)
[Compare Source](https://redirect.github.com/expressjs/express/compare/4.19.2...4.20.0)
\==========
- deps: serve-static@0.16.0
- Remove link renderization in html while redirecting
- deps: send@0.19.0
- Remove link renderization in html while redirecting
- deps: body-parser@0.6.0
- add `depth` option to customize the depth level in the parser
- IMPORTANT: The default `depth` level for parsing URL-encoded data is now `32` (previously was `Infinity`)
- Remove link renderization in html while using `res.redirect`
- deps: path-to-regexp@0.1.10
- Adds support for named matching groups in the routes using a regex
- Adds backtracking protection to parameters without regexes defined
- deps: encodeurl@~2.0.0
- Removes encoding of `\`, `|`, and `^` to align better with URL spec
- Deprecate passing `options.maxAge` and `options.expires` to `res.clearCookie`
- Will be ignored in v5, clearCookie will set a cookie with an expires in the past to instruct clients to delete the cookie
Configuration
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This PR contains the following updates:
4.19.2->4.20.0GitHub Vulnerability Alerts
CVE-2024-43796
Impact
In express <4.20.0, passing untrusted user input - even after sanitizing it - to
response.redirect()may execute untrusted codePatches
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:
Release Notes
expressjs/express (express)
### [`v4.20.0`](https://redirect.github.com/expressjs/express/blob/HEAD/History.md#4200--2024-09-10) [Compare Source](https://redirect.github.com/expressjs/express/compare/4.19.2...4.20.0) \========== - deps: serve-static@0.16.0 - Remove link renderization in html while redirecting - deps: send@0.19.0 - Remove link renderization in html while redirecting - deps: body-parser@0.6.0 - add `depth` option to customize the depth level in the parser - IMPORTANT: The default `depth` level for parsing URL-encoded data is now `32` (previously was `Infinity`) - Remove link renderization in html while using `res.redirect` - deps: path-to-regexp@0.1.10 - Adds support for named matching groups in the routes using a regex - Adds backtracking protection to parameters without regexes defined - deps: encodeurl@~2.0.0 - Removes encoding of `\`, `|`, and `^` to align better with URL spec - Deprecate passing `options.maxAge` and `options.expires` to `res.clearCookie` - Will be ignored in v5, clearCookie will set a cookie with an expires in the past to instruct clients to delete the cookieConfiguration
📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).
🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.
â™» Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.
🔕 Ignore: Close this PR and you won't be reminded about these updates again.
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