Several vulnerabilities were discovered in Rack, a modular Ruby webserver interface. The Common Vulnerabilites and Exposures project identifies the following vulnerabilities: CVE-2011-5036 Rack computes hash values for form parameters without restricting the ability to trigger hash collisions predictably, which allows remote attackers to cause a denial of service (CPU consumption) by sending many crafted parameters. CVE-2013-0183 A remote attacker could cause a denial of service (memory consumption and out-of-memory error) via a long string in a Multipart HTTP packet. CVE-2013-0184 A vulnerability in Rack::Auth::AbstractRequest allows remote attackers to cause a denial of service via unknown vectors. CVE-2013-0263 Rack::Session::Cookie allows remote attackers to guess the session cookie, gain privileges, and execute arbitrary code via a timing attack involving an HMAC comparison function that does not run in constant time.

For the oldstable distribution (squeeze), these problems have been fixed in version 1.1.0-4+squeeze1. The stable, testing and unstable distributions do not contain the librack-ruby package. They have already been addressed in version 1.4.1-2.1 of the ruby-rack package. We recommend that you upgrade your librack-ruby packages.

Rack provides a minimal, modular and adaptable interface for developing web applications in Ruby. By wrapping HTTP requests and responses in the simplest way possible, it unifies and distills the API for web servers, web frameworks, and software in between (the so-called middleware) into a single method call.

librack-ruby on Debian Linux

This check tests the installed software version using the apt package manager.

• http://www.debian.org/security/2013/dsa-2783.html

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Updated on 2015-03-25