kmem.SuSE.txt

1999-08-17T00:00:00
ID PACKETSTORM:12127
Type packetstorm
Reporter Packet Storm
Modified 1999-08-17T00:00:00

Description

                                        
                                            `Date: Fri, 19 Mar 1999 22:45:29 -0800  
From: Aleph One <aleph1@UNDERGROUND.ORG>  
To: BUGTRAQ@netspace.org  
Subject: The default permissions on /dev/kmem is insecure.  
  
______________________________________________________________________________  
  
SuSE Security Announcement  
  
Packages: devs-*  
linux-2.0.35 and below  
Date: Thu Mar 18 10:22:11 CET 1999  
Affected: SuSE 6.0 and below, other Linux distributions  
SuSE 5.3 and below, other Linux distributions  
  
______________________________________________________________________________  
  
A security whole was discovered in the package mentioned above.  
Please update as soon as possible or disable the service if you are using  
this software on your SuSE Linux installation(s).  
  
Other Linux distributions or operating systems might be affected as  
well, please contact your vendor for information about this issue.  
  
Please note, that that we provide this information on as "as-is" basis only.  
There is no warranty whatsoever and no liability for any direct, indirect or  
incidental damage arising from this information or the installation of  
the update package.  
  
______________________________________________________________________________  
  
1. Problem Description  
  
The default permissions on /dev/kmem is insecure.  
  
A bug in all Linux 2.0.x kernels except 2.0.36 have a vulnerability  
which makes blind ip-spoofing possible.  
  
2. Impact  
  
If programs like lsof have got vulnerabilities (like buffer overflows)  
root access can easily be obtained.  
Note that lsof *had* a buffer overflow, for which SuSE issued a bug fix  
some time ago. Please ensure that you installed it.  
  
IP addresses used for authentication or logging can't be relied on.  
If services which rely on trust are used on a system, remote access  
to a system can be obtained.  
No authentication should rely on IP addresses anyway ...  
  
3. Solution  
  
Execute the following command:  
  
/bin/chmod 640 /dev/kmem  
  
Install the 2.0.36 or a 2.2.x kernel.  
They are available from our webserver (see below)  
  
______________________________________________________________________________  
  
Here is the md5 checksum of the upgrade package, please verify this  
before installing the new package:  
  
a0b520d70026ef236efd2c7d7c87b233 linux-2.0.36.tar.gz  
3e737f6f33534dd15c440cc5c51ebcb5 linux-2.0.36.SuSE.tgz  
4bd690ca533b6c07e2f81f160e59ee6c linux-2.2.3.tar.gz  
  
______________________________________________________________________________  
  
You will find the update on our ftp-Server:  
  
ftp://ftp.suse.com/pub/suse_update/kernel/  
http://www.suse.de/patches/index.html  
  
or try the following web pages for a list of mirrors:  
  
http://www.suse.de/ftp.html  
  
http://www.suse.com/en/ftp.html  
  
______________________________________________________________________________  
  
SuSE has got two free security mailing list services to which any  
interested party may subscribe:  
  
suse-security@suse.com - unmoderated and for general/linux/SuSE  
security discussions. All SuSE security  
announcements are send to this list.  
  
suse-security-announce@suse.com - SuSE's announce-only mailing list.  
Only SuSE's security annoucements are sent  
to this list.  
  
To subscribe, send an email to majordomo@suse.com with the text  
  
subscribe suse-security  
or  
subscribe suse-security-announce  
  
in the body of the message. Or just issue a  
  
echo subscribe suse-security | mail majordomo@suse.com  
or  
echo subscribe suse-security-announce | mail majordomo@suse.com  
  
______________________________________________________________________________  
  
If you want to report *NEW* security bugs in the SuSE Linux Distribution  
please send an email to security@suse.de or call our support line.  
You may use pgp with the public key below to ensure confidentiality.  
______________________________________________________________________________  
  
This information is provided freely to everyone interested and may  
be redistributed provided that it is not altered in any way.  
  
Type Bits/KeyID Date User ID  
pub 2048/3D25D3D9 1999/03/06 SuSE Security Team <security@suse.de>  
  
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`