Skipper vulnerable to SSRF via X-Skipper-Proxy

CRITICO 9.8CVE-2022-38580 · GHSA-f2rj-m42r-6jm2 · GO-2022-1086 · Published 25/10/2022 · updated 09/07/2026

Package	Affected versions	Patched versions
github.com/zalando/skipper Go	`< 0.13.237`	`0.13.237`
skipper zalando	`< 0.13.237`	`0.13.237`

Description

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

NVD description

Zalando Skipper v0.13.236 is vulnerable to Server-Side Request Forgery (SSRF).

References

zalando/skipper security advisory · WEB
nvd.nist.gov/vuln/detail/CVE-2022-38580 · ADVISORY
zalando/skipper#2058 · WEB
zalando/skipper commit 8426343 · WEB
gist.github.com/Fadavvi/9fffcfa4aaa9e25b77cfe7b3044b2857 · WEB
zalando/skipper · PACKAGE
zalando/skipper release v0.13.237 · WEB
pastebin.com/dXxpgPAK · WEB
pkg.go.dev/vuln/GO-2022-1086 · WEB
packetstormsecurity.com/files/171546/X-Skipper-Proxy-0.13.237-Server-Side-Request-Forgery.html · WEB
skipper.com · WEB
zalando.com · WEB

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