Debian Security Advisory DSA 2783-1 (librack-ruby - several vulnerabilities)

Several vulnerabilities were discovered in Rack, a modular Ruby webserver interface. The Common Vulnerabilities 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.

librack-ruby on Debian Linux

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

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.