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             AUSCERT External Security Bulletin Redistribution

           ESB-2004.0798 -- iDEFENSE Security Advisory 12.20.04
          IBM AIX invscout Local Command Execution Vulnerability
                             21 December 2004


        AusCERT Security Bulletin Summary

Product:           invscout
Publisher:         iDEFENSE
Operating System:  AIX
Impact:            Execute Arbitrary Code/Commands
                   Root Compromise
Access:            Existing Account
CVE Names:         CAN-2004-1054

Original Bulletin: http://www.idefense.com/application/poi/display?id=171

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IBM AIX invscout Local Command Execution Vulnerability

iDEFENSE Security Advisory 12.20.04
December 20, 2004


The invscout program is a setuid root application, installed by default 
under newer versions of IBM AIX, that surveys the host system for
currently installed microcode or Vital Product Data (VPD).


Local exploitation of an untrusted path vulnerability in the invscout 
command included by default in multiple versions of IBM Corp.'s AIX 
could allow attackers to execute arbitrary code as the root user. 

During execution, invscout invokes an external application ("lsvpd") 
without dropping privileges. This application in turn invokes another 
external application ("uname"), while trusting the user-specified PATH 
environment variable. As root privileges are not dropped before this 
sequence of execution occurs, it is possible for an attacker to gain 
root access by specifying a controlled path and creating a malicious 
binary within that path. To exploit the vulnerability, an attacker needs
only to create an executable file called "uname" that contains malicious
code, set the PATH variable to the current directory and execute 


Exploitation of this vulnerability allows local attackers to gain 
increased privileges. Successful explication requires a local account
and a writable directory. This directory can be the user's home
directory, or even the /tmp directory. Exploitation does not require
any knowledge of application internals, making privilege escalation
trivial, even for unskilled attackers.


iDEFENSE has confirmed the existence of this vulnerability in IBM AIX 
version 5.2.0. 


Only allow trusted users local access to security critical systems. 
Alternately, remove the setuid bit from invscout using chmod u-s 


"IBM provides the following fixes:

   APAR number for AIX 5.1.0: IY64852 (available)
   APAR number for AIX 5.2.0: IY64976 (available)
   APAR number for AIX 5.3.0: IY64820 (available)

NOTE: Affected customers are urged to upgrade to 5.1.0, 5.2.0 or 5.3.0
at the latest maintenance level."


The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CAN-2004-1054 to this issues. This is a candidate for inclusion
in the CVE list (http://cve.mitre.org), which standardizes names for
security problems.


11/12/2004 Initial vendor notification
11/18/2004 Initial vendor response
12/20/2004 Coordinated public disclosure


iDEFENSE Labs is credited with this discovery.

Get paid for vulnerability research


Copyright (c) 2004 iDEFENSE, Inc.

Permission is granted for the redistribution of this alert
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There are no warranties with regard to this information. Neither the
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this information.

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