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Ruby Gem Karteek Docsplit 0.5.4 Command Injection

Ruby Gem Karteek Docsplit 0.5.4 Command Injection
Posted Apr 10, 2013
Authored by Larry W. Cashdollar

Ruby Gem Karteek Docsplit version 0.5.4 fails to sanitize user-supplied input. If a user is tricked into extracting a file with shell characters in the name, code can be executed remotely.

tags | exploit, shell, ruby
advisories | CVE-2013-1933
SHA-256 | b21afb51938c4e491625c88dec36626c10a2f58c611fc3dcdcfd45693ccba644

Ruby Gem Karteek Docsplit 0.5.4 Command Injection

Change Mirror Download
Remote Command Injection Ruby Gem Karteek Docsplit 0.5.4

4/1/2013
Larry W. Cashdollar
@_larry0

User supplied input isn't sanitized against shell metacharacters and is fed directly to the shell. If the user is tricked into extracting a file with shell characters in the name code can be executed remotely.

https://rubygems.org/gems/karteek-docsplit

./karteek-docsplit-0.5.4/lib/docsplit/text_extractor.rb

59 def extract_from_ocr(pdf, pages)
60 tempdir = Dir.mktmpdir
61 base_path = File.join(@output, @pdf_name)
62 if pages
63 pages.each do |page|
64 tiff = "{tempdir}/{@pdf_name}{page}.tif"
65 file = "{basepath}{page}"
66 run "MAGICKTMPDIR={tempdir} OMP_NUM_THREADS=2 gm convert -despeckle +adjoin #{MEMORY_ARGS} #{OCR_FLAGS} {pdf}[{page - 1}] #{tiff} 2>&1"
67 run "tesseract #{tiff} {file} -l eng 2>&1"
68 clean_text(file + '.txt') if @clean_ocr
69 FileUtils.remove_entry_secure tiff
70 end
71 else
72 tiff = "{tempdir}/{@pdf_name}.tif"
73 run "MAGICK_TMPDIR={tempdir} OMP_NUM_THREADS=2 gm convert -despeckle #{MEMORY_ARGS} #{OCR_FLAGS} #{pdf} #{tiff} 2>&1"
74 run "tesseract #{tiff} #{base_path} -l eng 2>&1"
75 clean_text(base_path + '.txt') if @clean_ocr
76 end

Run is defined as:

94 def run(command)
95 result = `#{command}`
96 raise ExtractionFailed, result if $? != 0
97 result
98 end

This vulnerability has been assigned CVE-2013-1933.

http://vapid.dhs.org/advisories/karteek-docsplit-cmd-inject.html




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