Ubuntu Security Notice USN-6055-1 ≈ Packet Storm

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Ubuntu Security Notice USN-6055-1^[6]: Authored by Ubuntu ^[7] | Site security.ubuntu.com ^[8]; Ubuntu Security Notice 6055-1 - It was discovered that Ruby incorrectly handled certain regular expressions. An attacker could possibly use this issue to cause a denial of service. It was discovered that Ruby incorrectly handled certain regular expressions. An attacker could possibly use this issue to cause a denial of service. This issue is being addressed only for Ubuntu 18.04 LTS and Ubuntu 20.04 LTS.; systems | linux ^[9], ubuntu ^[10]; advisories | CVE-2023-28755 ^[11], CVE-2023-28756 ^[12]; SHA-256 | 57cc9e7412e527b063da950b49c9036f3f360426a199720cba2c4ff74ccb4925; Download ^[13] | Favorite ^[14] | View ^[15]

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Ubuntu Security Notice USN-6055-1
May 04, 2023
ruby2.3, ruby2.5, ruby2.7 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 ESM
Summary:
Several security issues were fixed in Ruby.
Software Description:
- ruby2.7: Object-oriented scripting language
- ruby2.5: Object-oriented scripting language
- ruby2.3: Object-oriented scripting language
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)
It was discovered that Ruby incorrectly handled certain regular expressions.
An attacker could possibly use this issue to cause a denial of service.
This issue is being addressed only for Ubuntu 18.04 LTS and Ubuntu 20.04 LTS.
(CVE-2023-28756)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 20.04 LTS:
libruby2.7                      2.7.0-5ubuntu1.9
ruby2.7                         2.7.0-5ubuntu1.9
Ubuntu 18.04 LTS:
libruby2.5                      2.5.1-1ubuntu1.14
ruby2.5                         2.5.1-1ubuntu1.14
Ubuntu 16.04 ESM:
libruby2.3                      2.3.1-2~ubuntu16.04.16+esm5
ruby2.3                         2.3.1-2~ubuntu16.04.16+esm5
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-6055-1
CVE-2023-28755, CVE-2023-28756
Package Information:
https://launchpad.net/ubuntu/+source/ruby2.7/2.7.0-5ubuntu1.9
https://launchpad.net/ubuntu/+source/ruby2.5/2.5.1-1ubuntu1.14