Bug 2086396 (CVE-2022-21190)

Summary: CVE-2022-21190 convict: A Prototype Pollution Vulnerbility in convict
Product: [Other] Security Response Reporter: Sandipan Roy <saroy>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED NOTABUG QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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Last Closed: 2022-05-17 10:45:15 UTC Type: ---
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Description Sandipan Roy 2022-05-16 04:05:24 UTC 
This affects the package convict before 6.2.3. This is a bypass of [CVE-2022-22143](https://security.snyk.io/vuln/SNYK-JS-CONVICT-2340604). The [fix](https://github.com/mozilla/node-convict/commit/3b86be087d8f14681a9c889d45da7fe3ad9cd880) introduced, relies on the startsWith method and does not prevent the vulnerability: before splitting the path, it checks if it starts with __proto__ or this.constructor.prototype. To bypass this check it's possible to prepend the dangerous paths with any string value followed by a dot, like for example foo.__proto__ or foo.this.constructor.prototype.

https://github.com/mozilla/node-convict/blob/master/CHANGELOG.md%23623---2022-05-07
https://github.com/mozilla/node-convict/blob/3b86be087d8f14681a9c889d45da7fe3ad9cd880/packages/convict/src/main.js%23L571
https://gist.github.com/dellalibera/cebce20e51410acebff1f46afdc89808
https://snyk.io/vuln/SNYK-JS-CONVICT-2774757
https://github.com/mozilla/node-convict/commit/1ea0ab19c5208f66509e1c43b0d0f21c1fd29b75
Comment 2 Product Security DevOps Team 2022-05-17 10:45:13 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2022-21190