USN-4201-1: Ruby vulnerabilities

Releases

• Ubuntu 19.10
• Ubuntu 19.04
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM

Packages

• ruby2.3 - Object-oriented scripting language
• ruby2.5 - Interpreter of object-oriented scripting language Ruby

Details

It was discovered that Ruby incorrectly handled certain files.
An attacker could possibly use this issue to pass path matching
what can lead to an unauthorized access. (CVE-2019-15845)

It was discovered that Ruby incorrectly handled certain regular expressions.
An attacker could use this issue to cause a denial of service.
(CVE-2019-16201)

It was discovered that Ruby incorrectly handled certain HTTP headers.
An attacker could possibly use this issue to execute arbitrary code.
(CVE-2019-16254)

It was discovered that Ruby incorrectly handled certain inputs.
An attacker could possibly use this issue to execute arbitrary code.
(CVE-2019-16255)

Update instructions

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

Ubuntu 19.10

• libruby2.5 - 2.5.5-4ubuntu2.1
• ruby2.5 - 2.5.5-4ubuntu2.1

Ubuntu 19.04

• libruby2.5 - 2.5.5-1ubuntu1.1
• ruby2.5 - 2.5.5-1ubuntu1.1

Ubuntu 18.04

• libruby2.5 - 2.5.1-1ubuntu1.6
• ruby2.5 - 2.5.1-1ubuntu1.6

Ubuntu 16.04

• libruby2.3 - 2.3.1-2~ubuntu16.04.14
• ruby2.3 - 2.3.1-2~ubuntu16.04.14

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

References

• CVE-2019-15845
• CVE-2019-16201
• CVE-2019-16254
• CVE-2019-16255