BugTraq
Remote Command Injection in Ruby Gem sfpagent 0.4.14 Apr 18 2014 12:41PM
Larry W. Cashdollar (larry0 me com)
Title: Remote Command Injection in Ruby Gem sfpagent 0.4.14

Date: 4/15/2014

Author: Larry W. Cashdollar, @_larry0

CVE: 2014-2888

Download: http://rubygems.org/gems/sfpagent

Vulnerability
The list variable generated from the user supplied JSON[body] input is passed directly to the system() shell on line 649. If a user supplies a module name with shell metacharacters like ; they might be able to execute shell commands on the remote system as the sfpagent running user id.

From sfpagent-0.4.14/lib/sfpagent/bsig.rb:

637 code, body = get_data(address, port, '/modules')
638 raise Exception, "Unable to get modules list from {name}" if code.to_i != 200
639
640 modules = JSON[body]
641 list = ''
642 schemata.each { |m|
643 list += "{m} " if File.exist?("{modules_dir}/{m}") and
644 (not modules.has_key?(m) or modules[m] != get_local_module_hash(m, modules_dir).to_s)
645 }
646
647 return true if list == ''
648
649 if system("cd #{modules_dir}; #{install_module} #{address} #{port} #{list} 1>/dev/null 2>/tmp/install_module.error")
650 Sfp::Agent.logger.info "Push modules #{list}to #{name} [OK]"
651 else
652 Sfp::Agent.logger.warn "Push modules #{list}to #{name} [Failed]"
653 end
654
655 return true

Vendor: Notified 4/15/14. Version 0.4.15 fixes this issue.

Advisory: http://www.vapid.dhs.org/advisories/spfagent-remotecmd.html

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