Prototype Pollution in Mozilla Convict
CVE-2022-21190
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.
Vulnerability class: Prototype Pollution
EPSS: 0.038 (88.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Mozilla Convict
- N/a Convict — versions unspecified
Weakness classification (CWE)
Public proof-of-concept exploits
References
- report@snyk.io (Exploit, Third Party Advisory, x_refsource_MISC)
- report@snyk.io (Patch, Third Party Advisory, x_refsource_MISC, Broken Link)
- report@snyk.io (Exploit, Third Party Advisory, x_refsource_MISC)
- report@snyk.io (x_refsource_MISC, Release Notes, Broken Link, Tool Signature)
- report@snyk.io (Patch, x_refsource_MISC, Tool Signature)
Frequently asked questions
- What is CVE-2022-21190?
- CVE-2022-21190 is a high-severity vulnerability in Mozilla Convict, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 7.5/10. Published 2022-05-13.
- How severe is CVE-2022-21190?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2022-21190 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.