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Ubuntu Security Notice USN-1583-1

Ubuntu Security Notice USN-1583-1
Posted Sep 26, 2012
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1583-1 - It was 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. 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. Various other issues were also addressed.

tags | advisory, remote, ruby
systems | linux, ubuntu
advisories | CVE-2011-1005, CVE-2012-2126, CVE-2012-2125, CVE-2011-1005, CVE-2012-2125, CVE-2012-2126
MD5 | 6b766756fec0cb16ba8c38d13038e459

Ubuntu Security Notice USN-1583-1

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Content-Disposition: inline

==========================================================================Ubuntu Security Notice USN-1583-1
September 26, 2012

ruby1.9.1 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 12.04 LTS

Summary:

Several security issues were fixed in ruby1.9.1

Software Description:
- ruby1.9.1: Interpreter of object-oriented scripting language Ruby

Details:

It was 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-2011-1005)

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:
libruby1.9.1 1.9.3.0-1ubuntu2.2

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

References:
http://www.ubuntu.com/usn/usn-1583-1
CVE-2011-1005, CVE-2012-2125, CVE-2012-2126

Package Information:
https://launchpad.net/ubuntu/+source/ruby1.9.1/1.9.3.0-1ubuntu2.2

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