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Ubuntu Security Notice USN-6905-1
July 23, 2024

ruby-rack vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Rack could be made to consume resources and cause long delays if it
processed certain input.

Software Description:
- ruby-rack: modular Ruby webserver interface

Details:

It was discovered that Rack incorrectly handled certain regular
expressions. A remote attacker could possibly use this issue to cause
Rack to consume resources, leading to a denial of service.
(CVE-2023-27539)

It was discovered that Rack incorrectly handled Multipart MIME parsing.
A remote attacker could possibly use this issue to cause Rack to consume
resources, leading to a denial of service. This issue only affected
Ubuntu 20.04 LTS and Ubuntu 22.04 LTS. (CVE-2023-27530)

Update instructions:

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

Ubuntu 22.04 LTS
   ruby-rack                       2.1.4-5ubuntu1+esm4
                                   Available with Ubuntu Pro

Ubuntu 20.04 LTS
   ruby-rack                       2.0.7-2ubuntu0.1+esm4
                                   Available with Ubuntu Pro

Ubuntu 18.04 LTS
   ruby-rack                       1.6.4-4ubuntu0.2+esm5
                                   Available with Ubuntu Pro

Ubuntu 16.04 LTS
   ruby-rack                       1.6.4-3ubuntu0.2+esm5
                                   Available with Ubuntu Pro

Ubuntu 14.04 LTS
   ruby-rack                       1.5.2-3+deb8u3ubuntu1~esm7
                                   Available with Ubuntu Pro

After a standard system update you need to restart any applications using
Rack to make all the necessary changes.

References:
   https://ubuntu.com/security/notices/USN-6905-1
   CVE-2023-27530, CVE-2023-27539