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Ubuntu Security Notice USN-1603-1
October 10, 2012

ruby1.8 vulnerabilities

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

• Ubuntu 12.04 LTS
• Ubuntu 11.10
• Ubuntu 11.04
• Ubuntu 10.04 LTS

Summary:

Ruby could allow excessive access in untrusted programs.

Software Description:

• ruby1.8: Interpreter of object-oriented scripting language Ruby 1.8

Details:

Shugo Maedo and Vit Ondruch discovered that Ruby incorrectly allowed untainted
strings to be modified in protective safe levels. An attacker could use this
flaw to bypass intended access restrictions. (CVE-2012-4466, CVE-2012-4481)

Update instructions:

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

Ubuntu 12.04 LTS:
libruby1.8 1.8.7.352-2ubuntu1.1

Ubuntu 11.10:
libruby1.8 1.8.7.352-2ubuntu0.2

Ubuntu 11.04:
libruby1.8 1.8.7.302-2ubuntu0.2

Ubuntu 10.04 LTS:
libruby1.8 1.8.7.249-2ubuntu0.2

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

References:
http://www.ubuntu.com/usn/usn-1603-1
CVE-2012-4466, CVE-2012-4481

Package Information:
https://launchpad.net/ubuntu/+source/ruby1.8/1.8.7.352-2ubuntu1.1
https://launchpad.net/ubuntu/+source/ruby1.8/1.8.7.352-2ubuntu0.2
https://launchpad.net/ubuntu/+source/ruby1.8/1.8.7.302-2ubuntu0.2
https://launchpad.net/ubuntu/+source/ruby1.8/1.8.7.249-2ubuntu0.2

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