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CVE-2021-42717

Status Candidate

Overview

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.

Related Files

Ubuntu Security Notice USN-6370-1
Posted Sep 15, 2023
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6370-1 - It was discovered that ModSecurity incorrectly handled certain nested JSON objects. An attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. It was discovered that ModSecurity incorrectly handled certain HTTP multipart requests. A remote attacker could possibly use this issue to bypass ModSecurity restrictions.

tags | advisory, remote, web, denial of service
systems | linux, ubuntu
advisories | CVE-2021-42717, CVE-2022-48279, CVE-2023-24021
SHA-256 | a91e67eee18472678e2846c574b2535bcfb24598bdbebf873cf85a058f9c8879
Debian Security Advisory 5023-1
Posted Dec 28, 2021
Authored by Debian | Site debian.org

Debian Linux Security Advisory 5023-1 - It was discovered that modsecurity-apache, an Apache module to tighten the Web application security, does not properly handles excessively nested JSON objects, which could result in denial of service. The update introduces a new 'SecRequestBodyJsonDepthLimit' option to limit the maximum request body JSON parsing depth which ModSecurity will accept (defaults to 10000).

tags | advisory, web, denial of service
systems | linux, debian
advisories | CVE-2021-42717
SHA-256 | 3f85c3919db0ef69a9b1f2f2a1881936692b855d1c7c312fa5f4640492138172
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