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USN-5896-1: Rack vulnerabilities

27 February 2023

Several security issues were fixed in Rack.

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Releases

Packages

  • ruby-rack - modular Ruby webserver interface

Details

It was discovered that Rack was not properly parsing data when processing
multipart POST requests. If a user or automated system were tricked into
sending a specially crafted multipart POST request to an application using
Rack, a remote attacker could possibly use this issue to cause a denial of
service. (CVE-2022-30122)

It was discovered that Rack was not properly escaping untrusted data when
performing logging operations, which could cause shell escaped sequences
to be written to a terminal. If a user or automated system were tricked
into sending a specially crafted request to an application using Rack, a
remote attacker could possibly use this issue to execute arbitrary code in
the machine running the application. (CVE-2022-30123)

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Update instructions

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

Ubuntu 22.04
Ubuntu 20.04
Ubuntu 18.04

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

Related notices

  • USN-5253-1: librack-ruby1.8, ruby-rack, librack-ruby1.9.1, librack-ruby