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TITLE:
Ruby WEBrick Terminal Escape Sequences Weakness

SECUNIA ADVISORY ID:
SA37949

VERIFY ADVISORY:
http://secunia.com/advisories/37949/

DESCRIPTION:
A weakness has been reported in Ruby, which can be exploited by
malicious people to manipulate certain data.

The weakness is caused due to the WEBrick component logging terminal
escape sequences received in HTTP requests. This can be exploited to
pass control characters to a terminal emulator when a user displays
WEBrick logs via e.g. "cat".

The weakness is reported in the following versions:
* Ruby 1.8.6 patchlevel 383 and prior
* Ruby 1.8.7 patchlevel 248 and prior
* Ruby 1.9.1 patchlevel 376 and prior

SOLUTION:
Ruby 1.8.7:
Apply patchlevel 249:
ftp://ftp.ruby-lang.org/pub/ruby/1.8/ruby-1.8.7-p249.zip

Ruby 1.9.1:
Apply patchlevel 378:
ftp://ftp.ruby-lang.org/pub/ruby/1.9/ruby-1.9.1-p378.zip

Ruby 1.8.6:
Apply patchlevel 388:
ftp://ftp.ruby-lang.org/pub/ruby/1.8/ruby-1.8.6-p388.zip

PROVIDED AND/OR DISCOVERED BY:
Giovanni "evilaliv3" Pellerano, Alessandro "jekil" Tanasi, and
Francesco "ascii" Ongaro

ORIGINAL ADVISORY:
http://www.ruby-lang.org/en/news/2010/01/10/webrick-escape-sequence-injection/

http://www.ush.it/team/ush/hack_httpd_escape/adv.txt

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