1. Ubuntu Security Notices
  2. USN-6370-1

USN-6370-1: ModSecurity vulnerabilities

Publication date

14 September 2023

Overview

Several security issues were fixed in ModSecurity.

Releases

Packages

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)

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

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
22.04 jammy libapache2-mod-security2 –  2.9.5-1ubuntu0.1~esm1  
20.04 focal libapache2-mod-security2 –  2.9.3-1ubuntu0.1
18.04 bionic libapache2-mod-security2 –  2.9.2-1ubuntu0.1~esm1  
16.04 xenial libapache2-mod-security2 –  2.9.0-1ubuntu0.1~esm1  
libapache2-modsecurity –  2.9.0-1ubuntu0.1~esm1  
14.04 trusty libapache2-mod-security2 –  2.7.7-2ubuntu0.1~esm1  
libapache2-modsecurity –  2.7.7-2ubuntu0.1~esm1  

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References

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