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Ubuntu Security Notice USN-6370-1
September 14, 2023

modsecurity-apache vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 22.04 LTS (Available with Ubuntu Pro)
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS (Available with Ubuntu Pro)
- Ubuntu 16.04 LTS (Available with Ubuntu Pro)
- Ubuntu 14.04 LTS (Available with Ubuntu Pro)

Summary:

Several security issues were fixed in ModSecurity.

Software Description:
- modsecurity-apache: Tighten web applications security for Apache

Details:

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. (CVE-2021-42717)

It was discovered that ModSecurity incorrectly handled certain HTTP
multipart requests. A remote attacker could possibly use this issue
to bypass ModSecurity restrictions. (CVE-2022-48279)

It was discovered that ModSecurity incorrectly handled certain file
uploads. A remote attacker could possibly use this issue to cause a
buffer overflow and a firewall failure. This issue only affected
Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, Ubuntu 20.04 LTS and Ubuntu 22.04 LTS.
(CVE-2023-24021)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 22.04 LTS (Available with Ubuntu Pro):
   libapache2-mod-security2        2.9.5-1ubuntu0.1~esm1

Ubuntu 20.04 LTS:
   libapache2-mod-security2        2.9.3-1ubuntu0.1

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
   libapache2-mod-security2        2.9.2-1ubuntu0.1~esm1

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
   libapache2-mod-security2        2.9.0-1ubuntu0.1~esm1
   libapache2-modsecurity          2.9.0-1ubuntu0.1~esm1

Ubuntu 14.04 LTS (Available with Ubuntu Pro):
   libapache2-mod-security2        2.7.7-2ubuntu0.1~esm1
   libapache2-modsecurity          2.7.7-2ubuntu0.1~esm1

In general, a standard system update will make all the necessary changes.

References:
   https://ubuntu.com/security/notices/USN-6370-1
   CVE-2021-42717, CVE-2022-48279, CVE-2023-24021

Package Information:
   https://launchpad.net/ubuntu/+source/modsecurity-apache/2.9.3-1ubuntu0.1