irix.autofsd.txt

`Date: Wed, 21 Oct 1998 16:07:49 -0700  
From: RSI Advise <[email protected]>  
To: [email protected]  
Subject: RSI.0010.10-21-98.IRIX.AUTOFSD  
  
RSI.0010.10-21-98.IRIX.AUTOFSD  
  
  
  
|:::. |::::: |::::. |::::: |::::: |::::.  
.. :: .. .. :: .. .. .. ::  
|:::: |:::: |:::: :::::: |::::: |:::: |:  
|: :: |: |: |:: |: |: ::  
|: :: |::::: |: |::::: |::::: |:::::  
  
  
Repent Security Incorporated, RSI  
[ http://www.repsec.com ]  
  
  
*** RSI ALERT ADVISORY ***  
  
  
--- [CREDIT] --------------------------------------------------------------  
  
Mark Zielinski : Discovered the vulnerability, author of the advisory  
  
  
--- [SUMMARY] -------------------------------------------------------------  
  
Announced: October 2, 1998  
Report code: RSI.0010.10-21-98.IRIX.AUTOFSD  
Report title: IRIX autofsd  
  
Vulnerability: Please see the details section  
Vendor status: SGI contacted on October 2, 1998  
Patch status: No patch is currently available  
  
Platforms: IRIX 6.2, 6.3, 6.4, 6.5  
  
Reference: http://www.repsec.com/advisories.html  
Impact: If exploited, an attacker could potentially compromise  
root access locally on your server  
  
NOTE: IRIX versions 5.3, 6.0, and 6.1 were NOT tested, however  
they could be subject to the same vulnerability.  
  
  
--- [DETAILS] -------------------------------------------------------------  
  
Description: Autofsd is an RPC server which answers file system mount  
and umount requests from the autofs file system. It uses  
local files or name service maps to locate file systems to  
be mounted.  
  
Problem: Users locally on the system can send requests to the  
autofsd daemon and execute arbitrary commands as the  
superuser.  
  
Upon receiving a map argument from a client,  
the server will attempt to verify if it is executable  
or not. If autofsd determines the map has an executable  
flag, the server will append the client's key and attempt  
to execute it.  
  
By sending a map name that is executable on the server,  
and a key beginning with a semicolon or a newline followed  
by a command, unprivileged users can execute arbitrary  
commands as the superuser.  
  
The problem occurs when the server appends the key  
to the map and attempts to execute it by calling  
popen.  
  
Since popen executes the map and key you specify by  
invoking a shell, it is possible to force it into executing  
commands that were not meant to be executed.  
  
  
--- [FIX] -----------------------------------------------------------------  
  
Solution: Do not run autofsd until a patch is released for the  
version of IRIX you are running.  
  
  
---------------------------------------------------------------------------  
  
Repent Security Incorporated (RSI)  
13610 N. Scottsdale Rd.  
Suite #10-326  
Scottsdale, AZ 85254  
  
E-Mail: [email protected]  
FTP: ftp://ftp.repsec.com  
WWW: http://www.repsec.com  
  
---------------------------------------------------------------------------  
  
-----BEGIN PGP PUBLIC KEY BLOCK-----  
Version: 2.6.2  
  
mQCNAzU6dqAAAAEEAOHt9a5vevjD8ZjsEmncEbFp2U7aeqvPTcF/8FJMilgOVp75  
dshXvZixHsYU7flgCNzA7wLIQPWBQBrweLG6dx9gE9e5Ca6yAJxZg8wNsi06tZfP  
nvmvf6F/7xoWS5Ei4k3YKuzscxlyePNNKws6uUe2ZmwVoB+i3HHT44dOafMhAAUT  
tBpSZXBTZWMgPGFkdmlzZUByZXBzZWMuY29tPg==  
=ro8H  
-----END PGP PUBLIC KEY BLOCK-----  
  
Copyright October 1998 RepSec, Inc.  
  
The information in this document is provided as a service to customers  
of RepSec, Inc. Neither RepSec, Inc., nor any of it's employees, makes  
any warranty, express or implied, or assumes any legal liability or  
responsibility for the accuracy, completeness, or usefulness of any  
information, apparatus, product, or process contained herein, or  
represents that its use would not infringe any privately owned rights.  
Reference herein to any specific commercial products, process, or  
services by trade name, trademark, manufacturer, or otherwise, does not  
necessarily constitute or imply its endorsement, recommendation or  
favoring by RepSec, Inc. The views and opinions of authors express  
herein do no necessarily state or reflect those of RepSec, Inc., and may  
not be used for advertising or product endorsement purposes.  
  
The material in this alert advisory may be reproduced and distributed,  
without permission, in whole or in part, by other security incident  
response teams (both commercial and non-commercial), provided the above  
copyright is kept intact and due credit is given to RepSec, Inc.  
  
This alert advisory may be reproduced and distributed, without  
permission, in its entirety only, by any person provided such  
reproduction and/or distribution is performed for non-commercial  
purposes and with the intent of increasing the awareness of the Internet  
community.  
  
---------------------------------------------------------------------------  
  
RepSec, Inc. are trademarks of RepSec, Inc. All other trademarks are  
property of their respective holders.  
`