Rack: Denial of Service

1. Gentoo Linux Security Advisory

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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