Full Disclosure mailing list archives
Show In Browser 0.0.3 Ruby Gem /tmp file injection vulnerability
From: "Larry W. Cashdollar" <larry0 () me com>
Date: Fri, 24 May 2013 00:35:05 +0000 (GMT)
TITLE: Show In Browser 0.0.3 Ruby Gem /tmp file injection vulnerability. DATE: 5/15/2023 AUTHOR: Larry W. Cashdollar (@_larry0) DOWNLOAD: https://rubygems.org/gems/show_in_browser DESCRIPTION: Opens arbitrary text in your browser VENDOR: Jonathan Leung FIX: N/A CVE: 2013-2105 DETAILS: The following code uses the temporary file "/tmp/browser.html" insecurely. 2 FILE_LOCATION = "/tmp/browser.html" 3 4 class << self 5 6 def show(html) 7 file = File.open(FILE_LOCATION, 'w') 8 file.write(html) 9 file.close10 11 `open #{FILE_LOCATION}`
By a malicious user creating /tmp/browser.html first and repeatedly writing to it they can inject malicious html into the file right before it is about to be opened.
PoC: nobody () pitter:/$ while (true); do echo "<script> alert('Hello'); </script>" >> /tmp/browser.html; doneWill pop up a java script alert in other gem users browser.
ADVISORY: http://vapid.dhs.org/advisories/show_in_browser.html
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- Show In Browser 0.0.3 Ruby Gem /tmp file injection vulnerability Larry W. Cashdollar (May 23)