Details

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.redirect()
2. express MUST NOT redirect before the template appears
3. the browser MUST NOT complete redirection before:
4. the user MUST click on the link in the template

Severity

• CVSS Score: 2.3 / 10 (Low)
• Vector String: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:L

References

• https://github.com/expressjs/express/security/advisories/GHSA-qw6h-vgh9-j6wx
• https://nvd.nist.gov/vuln/detail/CVE-2024-43796
• https://github.com/expressjs/express/commit/54271f69b511fea198471e6ff3400ab805d6b553
• https://github.com/advisories/GHSA-qw6h-vgh9-j6wx

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

v4.20.0

Compare Source

==========

• 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