CVE-2020-7777
If an attacker can control the schema file, it could run arbitrary JavaScript code on the victim machine.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.11%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
This affects all versions of package jsen. If an attacker can control the schema file, it could run arbitrary JavaScript code on the victim machine. In the module description and README file there is no mention about the risks of untrusted schema files, so I assume that this is applicable. In particular the required field of the schema is not properly sanitized. The resulting string that is build based on the schema definition is then passed to a Function.apply();, leading to an Arbitrary Code Execution.
- CVSS 3.1
- 7.2 HIGHCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 2.11% probability · 81th percentile
- CISA KEV
- Not listed
- Affected
- jsen project/jsen
- Source
- report@snyk.io
References
- https://github.com/bugventure/jsen/blob/master/lib/jsen.js%23L875Broken Link
- https://snyk.io/vuln/SNYK-JS-JSEN-1014670Exploit, Third Party Advisory
- https://github.com/bugventure/jsen/blob/master/lib/jsen.js%23L875Broken Link
- https://snyk.io/vuln/SNYK-JS-JSEN-1014670Exploit, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.