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Category:   Application (Generic)  >   Ruby Vendors:   Matsumoto, Yukihiro
Ruby cgi.rb MIME Boundary Parsing Error Lets Remote Users Deny Service
SecurityTracker Alert ID:  1017194
SecurityTracker URL:  http://securitytracker.com/id/1017194
CVE Reference:   CVE-2006-5467   (Links to External Site)
Date:  Nov 8 2006
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 1.8.5 and prior
Description:   A vulnerability was reported in Ruby. A remote user can cause denial of service conditions.

The Ruby cgi.rb CGI library does not properly process multipart MIME boundaries. A remote user can send an HTTP request with a specially crafted multipart MIME boundary specifier to cause the target service to enter an infinite loop and consume excessive CPU resources.

A boundary specifier that begins with a dash character instead of two dash characters ('--') and also contains an inconsistent ID can trigger this flaw.

Zed A. Shaw reported this vulnerability.

The original advisory is available at:

http://rubyforge.org/pipermail/mongrel-users/2006-October/001946.html

Impact:   A remote user can cause the software to enter an infinite loop and consume excessive CPU resources.
Solution:   The vendor has issued a patch for version 1.8.5, available at:

http://ftp.ruby-lang.org/pub/ruby/1.8/ruby-1.8.5-cgi-dos-1.patch

The development version (1.9) is fixed after September 24, 2006.

The Ruby advisory is available at:

http://www.ruby-lang.org/en/news/2006/11/03/CVE-2006-5467/

Vendor URL:  www.ruby-lang.org/en/news/2006/11/03/CVE-2006-5467/ (Links to External Site)
Cause:   Exception handling error, Input validation error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Nov 8 2006 (Red Hat Issues Fix) Ruby cgi.rb MIME Boundary Parsing Error Lets Remote Users Deny Service
Red Hat has released a fix for Red Hat Enterprise Linux 2.1, 3, and 4.
May 25 2007 (Apple Issues Fix) Ruby cgi.rb MIME Boundary Parsing Error Lets Remote Users Deny Service
Apple has released a fix for Mac OS X.



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