Re: Sonicwall SOHO Content Blocking Script Injection, LogFile Denial of Service

["E M" <rdnktrk () hotmail com>]

Yes Sonicwall was contacted. I am working with them to resolve this issue.

> Although you so determinedly state this is exploitable internally >only, it 
> presents not only a busy-work issue for admins but obviously >CAN be 
> reworked to an externally initiated instance by anyone with a >modicum of 
> development knowledge.

True, no argument here, but any way you look at it, the issue involves 
people on the LAN interface instigating the problem, if you can show how 
this can be done on the WAN interface without LAN interaction, I'd love to 
see it.

Eric M.


> From: "JNJ" <jnj () pobox com>
> To: <bugtraq () securityfocus com>
> CC: <vuln-dev () securityfocus com>
> Subject: Re: Sonicwall SOHO Content Blocking Script Injection, LogFile 
> Denial of Service
> Date: Fri, 17 May 2002 14:25:34 -0400
>
> And did you by chance contact the Sonicwall Corporation prior to publishing
> this issue or did you simply rush to publish?  Although you so determinedly
> state this is exploitable internally only, it presents not only a busy-work
> issue for admins but obviously CAN be reworked to an externally initiated
> instance by anyone with a modicum of development knowledge.
>
> James
>
> ----- Original Message -----
> From: "E M" <rdnktrk () hotmail com>
> To: <bugtraq () securityfocus com>
> Cc: <vuln-dev () securityfocus com>
> Sent: Friday, May 17, 2002 11:55 AM
> Subject: Sonicwall SOHO Content Blocking Script Injection, LogFile Denial 
> of
> Service
>
>
> > This advisory may be reproduced unmodified.
> >
> > Sonicwall SOHO Content Blocking Script Injection and Logfile DoS
> >
> > Test Unit :
> > Sonicwall SOHO3
> > Firmware version: 6.3.0.0
> > ROM version: 5.0.1.0
> >
> > Severity : Medium
> >
> > Issue :
> > Sonicwall Allows administrators to block websites based on a user 
> entered
> > list of domains. These websites are blocked whenever they accessed by
> > clients on the LAN interface.
> >
> > By passing a blocked URL injected script the attacker may execute 
> scripts
> > automatically when the logfile is viewed.
> >
> > The below example uses a commonly blocked ad server, please note this 
> must
> > be in your blocked sites list and that any site that is blocked will 
> work
> > fine.
> >
> >
> bannerserver.gator.com/<SCRIPT>window.location.href="http://www.offroadwareh
> ouse.com";</SCRIPT>
> >
> > This will be injected into the logfile, when an Admin attempts to view 
> the
> > log files they will be automatically redirected to the site of your
> choice.
> >
> > Note that any <SCRIPT> is executed, for the example I show redirection 
> as
> a
> > means of Denial of Service.
> >
> > Resolution :
> > Only after rebooting the unit will you gain access to the logfiles, the
> log
> > is cleared on each reboot, thus you will be unable to locate the user on
> the
> > LAN segment who initiated the attack.
> >
> >
> > Mitigating Factors :
> > This attack must come from the Lan interface, which means that it is not
> > remotely exploitable, this conclusion may be false but will be tested
> > further.
> >
> >
> > Author :
> > Eric McCarty
> > rdnktrk () hotmail com
> >
> >
> >
> >
> > _________________________________________________________________
> > Send and receive Hotmail on your mobile device: http://mobile.msn.com
> >


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