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===========================================================================
              AUSCERT External Security Bulletin Redistribution
                             
                   ESB-1999.022 -- Red Hat Linux Bulletin
                    SECURITY: New lsof packages available
                              22 February 1999

===========================================================================

Red Hat Software, Inc. has released the following advisory concerning a  
buffer overflow vulnerability in the lsof binary.  The Red Hat lsof binary 
is shipped setgid kmem and by exploiting this vulnerability a local user 
may be able to get kmem group access.  

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Red Hat Linux 5.2 is shipping with a vulnerable version of lsof. The lsof
binary is shipped setgid kmem and by exploiting a buffer overflow a user
will be able to get kmem group access. Fortunately the permissions on
/dev/kmem on Red Hat Linux will only grant read only access to kmem group
members, so this exploit can not be used to get root access.

There is an exploit floating around the net for this security problem which
is based on the fact that some distributions grant both read and write
access for the kmem group members to /dev/kmem.

Red Hat would like to thank HERT - Hacker Emergency Response Team - for
bringing this problem to our attention.

Although this security hole can not be used to get root access on Red Hat
Linux, there are privacy concerns that prompt us to release a security
update for the lsof package. All users of Red Hat Linux 5.2 are encouraged
to upgrade to the new lsof packages immediately. As always, these packages
have been signed with the Red Hat PGP key.

Red Hat Linux 5.2:
==================

alpha:
rpm -Uvh ftp://updates.redhat.com/5.2/alpha/lsof-4.40-1.alpha.rpm

i386:
rpm -Uvh ftp://updates.redhat.com/5.2/i386/lsof-4.40-1.i386.rpm

sparc:
rpm -Uvh ftp://updates.redhat.com/5.2/sparc/lsof-4.40-1.sparc.rpm

Source rpm:
rpm -Uvh ftp://updates.redhat.com/5.2/SRPMS/lsof-4.40-1.src.rpm

Cristian
- - --
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Cristian Gafton   --   gafton@redhat.com   --   Red Hat Software, Inc.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 UNIX is user friendly. It's just selective about who its friends are.

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This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content.  The decision to use any or all of this information is
the responsibility of each user or organisation, and should be done so in
accordance with site policies and procedures.

NOTE: This is only the original release of the security bulletin.  It will
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the original authors to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

	http://www.auscert.org.au/Information/advisories.html

If you believe that your system has been compromised, contact AusCERT or
your representative in FIRST (Forum of Incident Response and Security
Teams).

Internet Email: auscert@auscert.org.au
Facsimile:	(07) 3365 7031
Telephone:	(07) 3365 4417 (International: +61 7 3365 4417)
		AusCERT personnel answer during Queensland business hours
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