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Ubuntu: (Multiple Advisories) (CVE-2021-42717): ModSecurity vulnerabilities

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Ubuntu: (Multiple Advisories) (CVE-2021-42717): ModSecurity vulnerabilities

Severity
5
CVSS
(AV:N/AC:L/Au:N/C:N/I:N/A:P)
Published
12/07/2021
Created
09/18/2023
Added
09/18/2023
Modified
09/18/2023

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.

Solution(s)

  • ubuntu-upgrade-libapache2-mod-security2
  • ubuntu-upgrade-libapache2-modsecurity

References

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