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Ubuntu Security Notice USN-7091-2
November 21, 2024

ruby2.7 vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in Ruby.

Software Description:
- ruby2.7: Object-oriented scripting language

Details:

USN-7091-1 fixed several vulnerabilities in Ruby. This update provides the
corresponding update for ruby2.7 in Ubuntu 20.04 LTS.

Original advisory details:

 It was discovered that Ruby incorrectly handled parsing of an XML document
 that has specific XML characters in an attribute value using REXML gem. An
 attacker could use this issue to cause Ruby to crash, resulting in a
 denial of service. This issue only affected in Ubuntu 22.04 LTS and Ubuntu
 24.04 LTS. (CVE-2024-35176, CVE-2024-39908, CVE-2024-41123)
 
 It was discovered that Ruby incorrectly handled parsing of an XML document
 that has many entity expansions with SAX2 or pull parser API. An attacker
 could use this issue to cause Ruby to crash, resulting in a denial of
 service. (CVE-2024-41946)
 
 It was discovered that Ruby incorrectly handled parsing of an XML document
 that has many digits in a hex numeric character reference. An attacker
 could use this issue to cause Ruby to crash, resulting in a denial of
 service. (CVE-2024-49761)

Update instructions:

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

Ubuntu 20.04 LTS
  libruby2.7                      2.7.0-5ubuntu1.15
  ruby2.7                         2.7.0-5ubuntu1.15

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

References:
  https://ubuntu.com/security/notices/USN-7091-2
  https://ubuntu.com/security/notices/USN-7091-1
  CVE-2024-35176, CVE-2024-39908, CVE-2024-41123, CVE-2024-41946,
  CVE-2024-49761, https://launchpad.net/bugs/2086615

Package Information:
  https://launchpad.net/ubuntu/+source/ruby2.7/2.7.0-5ubuntu1.15