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Date: Sat, 18 May 2013 01:00:48 -0600
From: Kurt Seifried <kseifried@...hat.com>
To: oss-security@...ts.openwall.com
CC: "Larry W. Cashdollar" <larry0@...com>
Subject: Re: Show In Browser 0.0.3 Ruby Gem /tmp file injection
 vulnerability

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On 05/17/2013 10:34 AM, Larry W. Cashdollar wrote:
> 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.

Please use CVE-2013-2105 for this issue.

- -- 
Kurt Seifried Red Hat Security Response Team (SRT)
PGP: 0x5E267993 A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993
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