Executive Summary

Informations
Name CVE-2020-7777 First vendor Publication 2020-11-23
Vendor Cve Last vendor Modification 2020-12-03

Security-Database Scoring CVSS v3

Cvss vector : CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Overall CVSS Score 7.2
Base Score 7.2 Environmental Score 7.2
impact SubScore 5.9 Temporal Score 7.2
Exploitabality Sub Score 1.2
 
Attack Vector Network Attack Complexity Low
Privileges Required High User Interaction None
Scope Unchanged Confidentiality Impact High
Integrity Impact High Availability Impact High
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:S/C:P/I:P/A:P)
Cvss Base Score 6.5 Attack Range Network
Cvss Impact Score 6.4 Attack Complexity Low
Cvss Expoit Score 8 Authentication Requires single instance
Calculate full CVSS 2.0 Vectors scores

Detail

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.

Original Source

Url : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-7777

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 1

Sources (Detail)

Source Url
MISC https://github.com/bugventure/jsen/blob/master/lib/jsen.js%23L875
https://snyk.io/vuln/SNYK-JS-JSEN-1014670

Alert History

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Date Informations
2021-05-04 14:02:38
  • Multiple Updates
2021-04-22 03:08:19
  • Multiple Updates
2020-12-04 00:22:52
  • Multiple Updates
2020-11-23 21:23:21
  • First insertion