exploit the possibilities

tac_plus.txt

tac_plus.txt
Posted Feb 5, 2002
Authored by Kevin A. Nassery

Tac_plus, an example and unsupported TACACS+ server developed by Cisco, insecurely creates files.

systems | cisco
MD5 | 6c5e1e9c2315dc458bc4a61de2523c71

tac_plus.txt

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----------------------------

The program tac_plus, an example and unsupported TACACS+ server
developed by Cisco, insecurely
creates files.

Author: Kevin A. Nassery
Email: kevin@nassery.org



Small description ;-) I have had a *very* rough weekend ;-)))


-----------------------------

Regards,

Niels



Software: tac_plus version F4.0.4.alpha, compiled
on Solaris 8 sparc.

Abstract:
tac_plus version F4.0.4.alpha, an example Tacacs+ daemon released
(but not supported) by Cisco isn't careful with it's permissions when
creating accounting files.

Vulneribility:
Any file defined with and accounting directive, in a tac_plus
config file, is create with file permissions set at 666.

Allowing any system account to modify its contents.

When appending to the file, if it's not there initially, it is created.
When it is created it is done so with file permissions set at 666.
A simple work arround is to create a file, at the path set in the
config file, and manually set the permission to 600. The tac_plus
daemon will continue to append to the file, without setting the
permissions back to 666. I just wanted to make sure this was out there
for people who are rotating logs, and just letting the daemon create
new files.

Kevin Nassery
Network & Security Engineer
http://nassery.org

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