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Ubuntu 20.04 LTS USN-6055-2 Critical: Ruby Denial Of Service

ubuntu
Calendar Grey May 5, 2023
Dist Ubuntu Esm H88
The Ubuntu Security Team has released a vital advisory on a critical regression in Ruby due to USN-6055-1, impacting multiple releases. Review the mitigation steps now
USN-6055-1 introduced a regression.

Summary

USN-6055-1 introduced a regression.

Software Description:

- ruby2.7: Object-oriented scripting language

- ruby2.5: Object-oriented scripting language

- ruby2.3: Object-oriented scripting language

Details:

USN-6055-1 fixed a vulnerability in Ruby. Unfortunately it introduced a regression.

This update reverts the patches applied to CVE-2023-28755 in order to fix the regression

pending further investigation.

We apologize for the inconvenience.

Original advisory details:

It was discovered that Ruby incorrectly handled certain regular expressions.

An attacker could possibly use this issue to cause a denial of service.

(CVE-2023-28755)

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu ruby regression

Update Instructions

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

Ubuntu 20.04 LTS:
  libruby2.7                      2.7.0-5ubuntu1.10
  ruby2.7                         2.7.0-5ubuntu1.10

Ubuntu 18.04 LTS:
  libruby2.5                      2.5.1-1ubuntu1.15
  ruby2.5                         2.5.1-1ubuntu1.15

Ubuntu 16.04 ESM:
  libruby2.3                      2.3.1-2~ubuntu16.04.16+esm6
  ruby2.3                         2.3.1-2~ubuntu16.04.16+esm6

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

References

https://ubuntu.com/security/notices/USN-6055-2

https://ubuntu.com/security/notices/USN-6055-1

CVE-2023-28755, https://bugs.launchpad.net/ubuntu/+source/puppet/+bug/2018547

Severity
critical
Lowest
Low
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Critical

May 05, 2023

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu ruby regression

Package Information

https://launchpad.net/ubuntu/+source/ruby2.7/2.7.0-5ubuntu1.10
https://launchpad.net/ubuntu/+source/ruby2.5/2.5.1-1ubuntu1.15

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