CVE-2021-42717

 

Published at: - 07-12-2021 11:15

Last modified: - 03-09-2022 05:33

Total changes: - 7

Description

ModSecurity 3.x through 3.0.5 mishandles excessively nested JSON objects. Crafted JSON objects with nesting tens-of-thousands deep could result in the web server being unable to service legitimate requests. Even a moderately large (e.g., 300KB) HTTP request can occupy one of the limited NGINX worker processes for minutes and consume almost all of the available CPU on the machine. Modsecurity 2 is similarly vulnerable: the affected versions include 2.8.0 through 2.9.4.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

 

Verification logic

 

Reference

• https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/modsecurity-dos-vulnerability-in-json-parsing-cve-2021-42717/
• DSA-5023-Third Party Advisory
• https://www.oracle.com/security-alerts/cpuapr2022.html
• [debian-lts-announce] 20220528 [SECURITY] [DLA 3031-1] modsecurity-apache security update-Mailing List, Third Party Advisory

 

Keywords

NVD

 

CVE-2021-42717

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures