Remote command Injection in Creme Fraiche 0.6 Ruby Gem

["Larry W. Cashdollar" <larry0 () me com>]

TITLE: Remote command Injection in Creme Fraiche 0.6 Ruby Gem

DATE: 5/14/2013

AUTHOR: Larry W. Cashdollar (@_larry0)

DOWNLOAD: http://rubygems.org/gems/cremefraiche, http://www.uplawski.eu/technology/cremefraiche/

DESCRIPTION: Converts Email to PDF files.

VENDOR: Notifed on 5/13/2013, provided fix 5/14/2013

FIX: Version in 0.6.1

CVE: 2013-2090

DETAILS: The following lines pass unsanitized user input directly to the command line.
A malicious email attachment with a file name consisting of shell meta characters could inject commands into the shell.

If the attacker is allowed to specify a filename (via a web gui) commands could be injected that way as well.

218 cmd = "pdftk %s updateinfo %s output %s" %[pdf, infofile, tfile] 219 @log.debug('pdftk-command is ' << cmd) 220 
pdftkresult = system( cmd)

GREETINGS: @vladz,@quine,@BrandonTansey,@sushidude,@jkouns,@sub_space and @attritionorg

ADVISORY: http://vapid.dhs.org/advisories/cremefraiche-cmd-inj.html

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