DSA 2783-2: librack-ruby regression update
Posted on: 10/25/2013 10:11 AM

A librack-ruby regression update has been released for Debian

DSA 2783-2: librack-ruby regression update

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Debian Security Advisory DSA-2783-2 security@debian.org
http://www.debian.org/security/ Salvatore Bonaccorso
October 24, 2013 http://www.debian.org/security/faq
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Package : librack-ruby
Vulnerability : several
Problem type : remote
Debian-specific: no
CVE ID : CVE-2011-5036 CVE-2013-0183 CVE-2013-0184 CVE-2013-0263
Debian Bug : 653963 698440 700226

The update of librack-ruby in DSA-2783-1 also addressed CVE-2013-0183.
The patch applied breaks rails applications like redmine (see Debian Bug
#727187). Updated packages are available to address this problem.

For reference, the original advisory text follows:

Several vulnerabilities were discovered in Rack, a modular Ruby
webserver interface. The Common Vulnerabilites and Exposures project
identifies the following vulnerabilities:


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.


Vulnerability in Rack::Auth::AbstractRequest allows remote
attackers to cause a denial of service via unknown vectors.


Rack::Session::Cookie allows remote attackers to guess the
session cookie, gain privileges, and execute arbitrary code via a
timing attack involving am 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.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: http://www.debian.org/security/

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