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Rack: Denial of Service


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 201203-05 / rack
Release Date March 06, 2012
Latest Revision March 06, 2012: 1
Impact normal
Exploitable remote
Package Vulnerable versions Unaffected versions Architecture(s)
dev-ruby/rack < 1.1.3 >= 1.1.3 All supported architectures

Related bugreports: #396455


A hash collision vulnerability in Rack allows remote attackers to cause a Denial of Service condition.

2.  Impact Information


Rack is a modular Ruby web server interface.


Rack does not properly randomize hash functions to protect against hash collision attacks.


A remote attacker could send a specially crafted form post, possibly resulting in a Denial of Service condition.

3.  Resolution Information


There is no known workaround at this time.


All Rack users should upgrade to the latest version:

Code Listing 3.1: Resolution

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=dev-ruby/rack-1.1.3"

4.  References


Page updated March 06, 2012

Summary: This is a Gentoo Linux Security Advisory

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