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AUSCERT External Security Bulletin Redistribution
ESB-2006.0241 -- [Solaris]
Security Vulnerability With The "/usr/ucb/ps" Command
29 March 2006
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AusCERT Security Bulletin Summary
---------------------------------
Product: /usr/ucb/ps
Publisher: Sun Microsystems
Operating System: Solaris 9
Solaris 8
Impact: Read-only Data Access
Access: Existing Account
Original Bulletin:
http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-102215-1
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Sun(sm) Alert Notification
* Sun Alert ID: 102215
* Synopsis: Security Vulnerability With The "/usr/ucb/ps" Command
* Category: Security
* Product: Solaris 9 Operating System, Solaris 8 Operating System
* BugIDs: 4798073
* Avoidance: Patch, Workaround
* State: Resolved
* Date Released: 27-Mar-2006
* Date Closed: 27-Mar-2006
* Date Modified:
1. Impact
A security vulnerability in the "/usr/ucb/ps" (see ps(1B)) command may
allow unprivileged local users the ability to see environment
variables and their values for processes which belong to other users.
2. Contributing Factors
This issue can occur in the following releases:
SPARC Platform
* Solaris 8 without patch 109023-05
* Solaris 9 without patch 120240-01
x86 Platform
* Solaris 8 without patch 109024-05
* Solaris 9 without patch 120239-01
Note 1: Solaris 10 is not affected by this issue.
Note 2: The ps(1m) command is used for reporting process status. The
full path for this command is "/usr/bin/ps". In addition, there is
"/usr/ucb/ps" which is documented in the ps(1b) manual page. Only the
"/usr/ucb/ps" command is affected by the vulnerability described in
this Sun Alert.
In general users will use the "/usr/bin/ps" version as most will not
have the directory "/usr/ucb" in their command search path (see the
appropriate PATH section of relevant shell manual pages).
3. Symptoms
As an unprivileged user, running the "/usr/ucb/ps axe" command shows
all processes, and with the "e" flags, it also includes their
environment.
$ /usr/ucb/ps axe
PID TT S TIME COMMAND
...
53 ? S 0:00 /usr/lib/devfsadm/devfseventd LD_LIBRARY_PATH= PATH=/sb
in:
/usr/sbin:/usr/bin TZ=GB-Eire _INIT_PREV_LEVEL=0
...
In the example above we can see a root owned daemon, along with its
environment variables and their values.
4. Relief/Workaround
To work around the described issue, remove the set-id bit from
"/usr/ucb/ps".
5. Resolution
This issue is addressed in the following releases:
SPARC Platform
* Solaris 8 with patch 109023-05 or later
* Solaris 9 with patch 120240-01 or later
x86 Platform
* Solaris 8 with patch 109024-05 or later
* Solaris 9 with patch 120239-01 or later
This Sun Alert notification is being provided to you on an "AS IS"
basis. This Sun Alert notification may contain information provided by
third parties. The issues described in this Sun Alert notification may
or may not impact your system(s). Sun makes no representations,
warranties, or guarantees as to the information contained herein. ANY
AND ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
NON-INFRINGEMENT, ARE HEREBY DISCLAIMED. BY ACCESSING THIS DOCUMENT
YOU ACKNOWLEDGE THAT SUN SHALL IN NO EVENT BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES THAT ARISE
OUT OF YOUR USE OR FAILURE TO USE THE INFORMATION CONTAINED HEREIN.
This Sun Alert notification contains Sun proprietary and confidential
information. It is being provided to you pursuant to the provisions of
your agreement to purchase services from Sun, or, if you do not have
such an agreement, the Sun.com Terms of Use. This Sun Alert
notification may only be used for the purposes contemplated by these
agreements.
Copyright 2000-2006 Sun Microsystems, Inc., 4150 Network Circle, Santa
Clara, CA 95054 U.S.A. All rights reserved
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