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************************************************************************************
Netwosix Linux Security Advisory #2004-0003  
- -----------------------------------------------------------------------------------

Package name:      linux kernel
Summary:              Linux kernel do_mremap VMA limit local privilege 
escalation vulnerability.
Date:                    2004-02-20
Affected versions:  Netwosix 1.0
************************************************************************************

- -> Package description:
- ------------------------
Linux Kernel. The core of the Linux Operative System.

- -> Problem description:
- ------------------------
Linux kernel do_mremap VMA limit local privilege escalation
vulnerability.
A critical security vulnerability has been found in the Linux kernel
memory management code inside the mremap(2) system call due to missing
function return value check. This bug is completely unrelated to the
mremap bug disclosed on 05-01-2004 except concerning the same internal
kernel function code.

- -> Action:
- ------------------------
Download the latest Linux Kernel (2.6.3) or use the patches available from the 
Linux Kernel official site.

- - http://www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.3.tar.bz2 
- - http://www.kernel.org/pub/linux/kernel/v2.6/patch-2.6.3.bz2 

To build a new kernel:
Move your file into /usr/src and follow this instructions.

# tar xjf linux-2.6.3.tar.bz2
# cd /usr/src/linux-2.6.3
# make
# make modules
# make modules_install
# cp arch/i386/boot/bzImage /vmlinuz
# cp System.map /

To patch the kernel:

# mv patch-2.6.3.bz2 /usr/src/linux-2.6.1
# bzip2 -d patch-2.6.3.bz2
# patch -p1 < patch-2.6.3
# make
# make modules
# make modules_install
# cp arch/i386/boot/bzImage /vmlinuz
# cp System.map /

- -> References
- ---------------------

        Specific references for this advisory:
                http://www.isec.pl/vulnerabilities/isec-0014-mremap-unmap.txt 

- -> About Linux Netwosix:
- ---------------------------------
Linux Netwosix is a powerful and optimized Linux distribution for servers
and Network Security related jobs.  It can also be used for special operations
such as penetration testing with its big collection of security oriented
software and sources. It's a light distribution created for the requirements
of every SysAdmin and it's very portable and highly configurable. Our
philosophy is to give greater liberty for  configuration to the SysAdmin.
Only in this way can he/she configure a powerful and stable server machine.
Linux Netwosix also has a powerful ports system (Nepote) similar to the xBSD
systems but more flexible and usable.


- -> Questions?
- ---------------------
  Check out our mailing lists:
   


  The advisory itself is available at
   
- --------------------------------------------------

Vincenzo Ciaglia - Linux Netwosix Security Advisories
 -  
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