full-disclosure - [ElectronicSouls] - Linux insmod Advisory

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From: es at hush.com (es@...h.com)
Subject: [ElectronicSouls] - Linux insmod Advisory

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Dear List,

We've been sitting on this bug for quite some time, and now feel that
it is the appropriate time to share this information with the rest of
the world.  Patches will be available soon, so be sure to get your
apt-get and up2date scripts ready to roll.

# cat ESinsmod.txt
       +-+-+-+-+ +-+-+-+-+ [ Electronic Souls ] +-+-+-+-+ +-+-+-+-+

Research made by BuRn-X and vux! /sbin/insmod can't be exploited because it isn't suid but it stills a format bug.

Phat Linux testing:
GNU gdb 4.18
Copyright 1998 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-mandrake-linux"...
(no debugging symbols found)...
(gdb) r `perl -e'print "%n"x4086'`
Starting program: /sbin/insmod `perl -e'print "%n"x4086'`

Program received signal SIGSEGV, Segmentation fault.
0x40070ff3 in vsnprintf () from /lib/libc.so.6
(gdb)

GOT addresses:
- --> 0804eea4 R_386_JUMP_SLOT   vsnprintf

#

Thank you, and have a good day.

The Electronic Souls Crew
[ElectronicSouls] (c) 2002

"Pretzels do taste, yum, yes."
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