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The U.S. Department of Energy
Computer Incident Advisory Capability
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INFORMATION BULLETIN
Sun Solaris at(1) Command Vulnerability
[Sun(sm) Alert Notification 50161]
April 3, 2003 03:00 GMT Number N-070
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PROBLEM: Race condition and argument handling vulnerabilites exist in
the at(1) command, which may allow a user to remove any file on
the system.
PLATFORM: * Solaris 2.6
* Solaris 7
* Solaris 8
* Solaris 9
DAMAGE: If exploited, a local unprivileged user may be able to remove
any file on the system.
SOLUTION: Apply patch or workaround.
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VULNERABILITY The risk is MEDIUM. In order to exploit this vulnerability, an
ASSESSMENT: attacker would need a legitimate account and permission on the
target system to delete files.
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LINKS:
CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/n-070.shtml
ORIGINAL BULLETIN:
http://www.sunsolve.sun.com/pub-cgi/
retrieve.pl?doc=fsalert%2F50161&zone_32=category%3Asecurity
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[***** Start Sun(sm) Alert Notification 50161 *****]
Sun(sm) Alert Notification
Sun Alert ID: 50161
Synopsis: Security Vulnerability with the at(1) Command on Solaris
Category: Security
Product: Solaris
BugIDs: 4776480
Avoidance: Patch
State: Resolved
Date Released: 30-Jan-2003, 31-Mar-2003
Date Closed: 31-Mar-2003
Date Modified: 31-Mar-2003
1. Impact
A local unprivileged user may be able to remove any file on the system due to
a security vulnerability in the at(1) command.
Sun acknowledges with thanks, Wojciech Purczynski of iSEC Security Research,
for bringing this issue to our attention.
This issue is described in an iSEC Security Research advisory
(see http://isec.pl/vulnerabilities/isec-0008-sun-at.txt).
2. Contributing Factors
This issue can occur in the following releases:
SPARC Platform
Solaris 2.6 without patch 105181-34
Solaris 7 without patch 108319-03
Solaris 8 without patches 109007-09 and 108875-13
Solaris 9 without patch 114135-01
x86 Platform
Solaris 2.6 without patch 105182-34
Solaris 7 without patch 108320-03
Solaris 8 without patches 109008-09 and 108876-13
Solaris 9 without patch 114136-01
Notes: Solaris 2.5.1 will not be evaluated regarding a potential impact of
the issue described in this Sun Alert document.
The Solaris 8 cron/at patches 109007-09 and 109008-09 require the
libbsm/c2audit patches 108875-13 and 108876-13 respectively for the correct
functioning of the crontab(1) command. Future revisions of the Solaris 8
cron/at patches will contain the libbsm/c2audit binaries and will not require
the installation of the libbsm/c2audit patches.
3. Symptoms
There are no predictable symptoms that would show the described issue has
been exploited, as it depends on what file or files were deleted.
Solution Summary Top
4. Relief/Workaround
To work around the described issue, the set-user-ID bit can be removed from the
at(1) command. However, once the set-user-ID bit is removed the "at" command
will no longer function. As root do the following:
# chmod u-s /usr/bin/at
5. Resolution
This issue is addressed in the following releases:
SPARC Platform
Solaris 2.6 with patch 105181-34 or later
Solaris 7 with patch 108319-03 or later
Solaris 8 with patch 109007-09 and 108875-13 or later
Solaris 9 with patch 114135-01 or later
x86 Platform
Solaris 2.6 with patch 105182-34 or later
Solaris 7 with patch 108320-03 or later
Solaris 8 with patch 109008-09 and 108876-13 or later
Solaris 9 with patch 114136-01 or later
Change History
31-Mar-2003:
State: Resolved
Updated Contributing Factors and Resolution sections
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, th! e Sun.com Terms of Use.
This Sun Alert notification may only be used for the purposes contemplated
by these agreements.
Copyright 2000-2003 Sun Microsystems, Inc., 4150 Network Circle,
Santa Clara, CA 95054 U.S.A. All rights reserved.
[***** End Sun(sm) Alert Notification 50161 *****]
_______________________________________________________________________________
CIAC wishes to acknowledge the contributions of Sun Microsystems, Inc. and
iSec for the information contained in this bulletin.
_______________________________________________________________________________
CIAC, the Computer Incident Advisory Capability, is the computer
security incident response team for the U.S. Department of Energy
(DOE) and the emergency backup response team for the National
Institutes of Health (NIH). CIAC is located at the Lawrence Livermore
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