RSI.0010.10-21-98.IRIX.AUTOFSD
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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.
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Repent Security Incorporated (RSI)
13610 N. Scottsdale Rd.
Suite #10-326
Scottsdale, AZ 85254
E-Mail: adviseat_private
FTP: ftp://ftp.repsec.com
WWW: http://www.repsec.com
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Copyright October 1998 RepSec, Inc.
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