lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite for Android: free password hash cracker in your pocket
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <3F3BBDF9.3090802@snosoft.com>
Date: Thu, 14 Aug 2003 16:51:05 +0000
From: KF <dotslash@...soft.com>
To: Mariusz Woloszyn <emsi@...rtners.pl>
Cc: full-disclosure@...ts.netsys.com, bugtraq@...urityfocus.com
Subject: Re: Re: Buffer overflow prevention


Hrmm why does this bring HP to mind... oh yeah I remember...

HP-> "... oh you say you found a bunch of overflows... that does not 
matter... there is no way you will bypass our non-executable stack.. we 
are not going to fix any of them... we are gonna let em fester... our 
non-exec stack is Hack proof"

(time elapse... 2 months)

SNO-> "...oh yeah we bypassed your non-exec stack and have successfully 
exploited several of those overflows we told you about a few months ago...
bash-2.05a$ id
uid=201(dotslash) gid=15(users) groups=0(system)
bash-2.05a$ ./TRU64_su
# id
uid=0(root) gid=15(users) groups=15(users),0(system)
# sysconfig -q proc executable_stack
proc:
executable_stack = 0
(hrmm your stack REALLY helped out)

HP-> "ok thanks we will procede to sue you now"

-KF

> 
> It's been proved many times that non-executable stack adds NO security at
> all.
> Every single class of vulnerabilities exploitable with executable stack
> can be also exploited with non-executable stack.
> See for example our article (http://www.phrack.org/show.php?p=56&a=5)
> which shows how to bypass a stack protector even with a non-executable
> stack.
> 
> What we're discussing here is an internal structures and data protecting.
> IMHO the ProPolice (http://www.research.ibm.com/trl/projects/security/ssp/),
> is the best protection in this kind, even comparing to "two stack"
> approach.
> Beside that it's an existing, well tested and wide used (for example
> OpenBSD uses it by default now).
> I see no real reason why the major Linux companies are not using it for
> its products.
> 
> Best regards,
> 
> --
> Mariusz Woloszyn
> Internet Security Specialist, GTS - Internet Partners
> _______________________________________________
> Full-Disclosure - We believe in it.
> Charter: http://lists.netsys.com/full-disclosure-charter.html
> 

_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.netsys.com/full-disclosure-charter.html


Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ