Impact
Skipper prior to version v0.13.236 is vulnerable to server-side request forgery (SSRF). An attacker can exploit a vulnerable version of proxy to access the internal metadata server or other unauthenticated URLs by adding an specific header (X-Skipper-Proxy) to the http request.
Patches
The problem was patched in version https://github.com/zalando/skipper/releases/tag/v0.13.237.
Users need to upgrade to skipper >=v0.13.237.
Workarounds
Use dropRequestHeader("X-Skipper-Proxy") filter
References
https://github.com/zalando/skipper/releases/tag/v0.13.237
For more information
If you have any questions or comments about this advisory:
- Open an issue in https://github.com/zalando/skipper/issues/new/choose
- Chat with us in slack: https://app.slack.com/client/T029RQSE6/C82Q5JNH5
References
- https://github.com/zalando/skipper/security/advisories/GHSA-f2rj-m42r-6jm2
- https://nvd.nist.gov/vuln/detail/CVE-2022-38580
- https://gist.github.com/Fadavvi/9fffcfa4aaa9e25b77cfe7b3044b2857#file-cve-2022-38580
- https://pastebin.com/dXxpgPAK
- http://skipper.com
- http://zalando.com
- https://github.com/advisories/GHSA-f2rj-m42r-6jm2