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Ruby: Denial of Service vulnerability


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200611-12 / ruby
Release Date November 20, 2006
Latest Revision June 11, 2009: 02
Impact normal
Exploitable remote
Package Vulnerable versions Unaffected versions Architecture(s)
dev-lang/ruby < 1.8.5-r3 >= 1.8.5-r3 All supported architectures

Related bugreports: #153497


The Ruby cgi.rb CGI library is vulnerable to a Denial of Service attack.

2.  Impact Information


Ruby is a dynamic, open source programming language with a focus on simplicity and productivity.


Zed Shaw, Jeremy Kemper, and Jamis Buck of the Mongrel project reported that the CGI library shipped with Ruby is vulnerable to a remote Denial of Service by an unauthenticated user.


The vulnerability can be exploited by sending the cgi.rb library an HTTP request with multipart MIME encoding that contains a malformed MIME boundary specifier beginning with "-" instead of "--". Successful exploitation of the vulnerability causes the library to go into an infinite loop waiting for additional nonexistent input.

3.  Resolution Information


There is no known workaround at this time.


All Ruby users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=dev-lang/ruby-1.8.5-r3"

4.  References


Page updated November 20, 2006

Summary: This is a Gentoo Linux Security Advisory

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