=========================================================================Ubuntu Security Notice USN-1582-1
September 26, 2012

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

- Ubuntu 12.04 LTS

Summary:

RubyGems could be made to download and install malicious gem files.

Software Description:
- rubygems: package management framework for Ruby libraries/applications

Details:

John Firebaugh discovered that the RubyGems remote gem fetcher did not properly
verify SSL certificates. A remote attacker could exploit this to perform a man
in the middle attack to alter gem files being downloaded for installation.
(CVE-2012-2126)

John Firebaugh discovered that the RubyGems remote gem fetcher allowed
redirection from HTTPS to HTTP. A remote attacker could exploit this to perform
a man in the middle attack to alter gem files being downloaded for
installation. (CVE-2012-2125)

Update instructions:

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

Ubuntu 12.04 LTS:
  rubygems                        1.8.15-1ubuntu0.1

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

References:
  https://ubuntu.com/security/notices/USN-1582-1
  CVE-2012-2125, CVE-2012-2126

Package Information:
  https://launchpad.net/ubuntu/+source/rubygems/1.8.15-1ubuntu0.1