ESB-2018.3467 - [Ubuntu] Ruby: Multiple vulnerabilities 2018-11-06

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.3467
                           Ruby vulnerabilities
                              6 November 2018

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Ruby
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Modify Arbitrary Files         -- Remote/Unauthenticated
                   Provide Misleading Information -- Remote/Unauthenticated
                   Reduced Security               -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-16396 CVE-2018-16395 

Reference:         ESB-2018.3444

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3808-1

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==========================================================================
Ubuntu Security Notice USN-3808-1
November 05, 2018

ruby1.9.1, ruby2.0, ruby2.3, ruby2.5 vulnerabilities
==========================================================================

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

- - Ubuntu 18.10
- - Ubuntu 18.04 LTS
- - Ubuntu 16.04 LTS
- - Ubuntu 14.04 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
- - ruby1.9.1: Object-oriented scripting language
- - ruby2.0: Object-oriented scripting language

Details:

It was discovered that Ruby incorrectly handled certain X.509
certificates. An attacker could possibly use this issue to
bypass the certificate check. (CVE-2018-16395)

It was discovered that Ruby incorrectly handled certain
inputs. An attacker could possibly use this issue to execute
arbitrary code. (CVE-2018-16396)

Update instructions:

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

Ubuntu 18.10:
   libruby2.5                                            2.5.1-5ubuntu4.1
   ruby2.5                                                  2.5.1-5ubuntu4.1

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

Ubuntu 16.04 LTS:
   libruby2.3                                            2.3.1-2~16.04.11
   ruby2.3                                                  2.3.1-2~16.04.11

Ubuntu 14.04 LTS:
   libruby1.9.1                                        1.9.3.484-2ubuntu1.13
   libruby2.0                                            2.0.0.484-1ubuntu2.11
   ruby1.9.1                                              1.9.3.484-2ubuntu1.13
   ruby1.9.3                                              1.9.3.484-2ubuntu1.13
   ruby2.0                                                  2.0.0.484-1ubuntu2.11

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

References:
   https://usn.ubuntu.com/usn/usn-3808-1
   CVE-2018-16395, CVE-2018-16396

Package Information:
   https://launchpad.net/ubuntu/+source/ruby2.5/2.5.1-5ubuntu4.1
   https://launchpad.net/ubuntu/+source/ruby2.5/2.5.1-1ubuntu1.1
   https://launchpad.net/ubuntu/+source/ruby2.3/2.3.1-2~16.04.11
   https://launchpad.net/ubuntu/+source/ruby1.9.1/1.9.3.484-2ubuntu1.13
   https://launchpad.net/ubuntu/+source/ruby2.0/2.0.0.484-1ubuntu2.11

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