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Ubuntu Security Notice USN-4201-1

Ubuntu Security Notice USN-4201-1
Posted Nov 26, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4201-1 - 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. It was discovered that Ruby incorrectly handled certain regular expressions. An attacker could use this issue to cause a denial of service. It was discovered that Ruby incorrectly handled certain HTTP headers. An attacker could possibly use this issue to execute arbitrary code. Various other issues were also addressed.

tags | advisory, web, denial of service, arbitrary, ruby
systems | linux, ubuntu
advisories | CVE-2019-15845, CVE-2019-16201, CVE-2019-16254, CVE-2019-16255
SHA-256 | fb5207d2d5cd13b28e5fc571f6f9365cd6eb101ba786fb264b4bd1794b1d6f86

Ubuntu Security Notice USN-4201-1

Change Mirror Download
=========================================================================
Ubuntu Security Notice USN-4201-1
November 26, 2019

ruby2.3, ruby2.5 vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 19.10
- Ubuntu 19.04
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in Ruby.

Software Description:
- ruby2.5: Interpreter of object-oriented scripting language Ruby
- ruby2.3: Object-oriented scripting language

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 LTS:
libruby2.5 2.5.1-1ubuntu1.6
ruby2.5 2.5.1-1ubuntu1.6

Ubuntu 16.04 LTS:
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:
https://usn.ubuntu.com/4201-1
CVE-2019-15845, CVE-2019-16201, CVE-2019-16254, CVE-2019-16255

Package Information:
https://launchpad.net/ubuntu/+source/ruby2.5/2.5.5-4ubuntu2.1
https://launchpad.net/ubuntu/+source/ruby2.5/2.5.5-1ubuntu1.1
https://launchpad.net/ubuntu/+source/ruby2.5/2.5.1-1ubuntu1.6
https://launchpad.net/ubuntu/+source/ruby2.3/2.3.1-2~ubuntu16.04.14
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