full-disclosure - NUL Character Evasion

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Message-ID: <D7DDF83751235046BFAC82E1244EB4C8088D8264@usilms23.ca.com>
Date: Fri Sep 16 17:05:15 2005
From: James.Williams at ca.com (Williams, James K)
Subject: NUL Character Evasion

> List:       full-disclosure
> Subject:    Re: [Full-disclosure] NUL Character Evasion
> From:       fd () ew ! nsci ! us
> Date:       2005-09-15 19:57:30
>
> > > On Thu, 15 Sep 2005, Williams, James K wrote:
> > > List:       full-disclosure
> > > Subject:    [Full-disclosure] NUL Character Evasion
> > > From:       ju () heisec ! de
> > > Date:       2005-09-13 21:24:42
> >
> > Thank you for the report.  Computer Associates is currently 
> > investigating the issue (as it relates to CA products).
> > 
> > Regards,
> > kw
> 
> Ken,  
>
> How long until this update hits your product?
>
> -Eric
>
> -- 
> Eric Wheeler

As initially suspected, from the AV signature perspective, this
is not a critical issue until and unless something specific 
shows up in the wild or is reported to a vendor. The NUL char 
insertion concept is similar in theory to, for example, K2's 
classic ADMmutate[1] polymorphic shellcode engine for NIDS 
evasion, or simply adding NOPs to an executable. Alex and 
Neel[2] discussed this class of AV vulns at core05 and Blackhat.

Regards,
kw

[1] http://www.ktwo.ca/security.html
[2] http://www.blackhat.com/presentations/bh-usa-05/bh-us-05-wheeler.pdf