Critical severity · published May 13, 2022
CVE-2022-21190
This affects the package convict before 6.2.3
9.8
CVSS
4%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)4.0% · higher than 90% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CO
Convict · Mozilla
before 6.2.3 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2022-21190
CVE.org
https://www.cve.org/CVERecord?id=CVE-2022-21190
Exploit
https://gist.github.com/dellalibera/cebce20e51410acebff1f46afdc89808
Broken Link
https://github.com/mozilla/node-convict/blob/3b86be087d8f14681a9c889d45da7fe3ad9cd880/packages/convict/src/main.js%23L571
Broken Link
https://github.com/mozilla/node-convict/blob/master/CHANGELOG.md%23623---2022-05-07
Patch
https://github.com/mozilla/node-convict/commit/1ea0ab19c5208f66509e1c43b0d0f21c1fd29b75
Exploit
https://snyk.io/vuln/SNYK-JS-CONVICT-2774757
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9.8
CVE-2022-22143
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8.4
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