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AUSCERT External Security Bulletin Redistribution
ESB-97.158 -- Sun Security Bulletin #00160
Vulnerability in at(1)
4 December 1997
Sun Microsystems Inc. has released the following advisory concerning a
vulnerability in the at(1) program. Information regarding this
vulnerability has been previously described in CERT Advisory CA-97.18
(re-released as AUSCERT ESB-97.072 on June 13, 1997).
The following security bulletin is provided as a service to AUSCERT's
members. As AUSCERT did not write this document, AUSCERT has had no
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be done so in accordance with site policies and procedures.
NOTE: This is only the original release of the security bulletin. It will
not be updated when the original bulletin is. If downloading at a later
date, it is recommended that the bulletin is retrieved from the original
authors to ensure that the information is still current.
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Sun Microsystems, Inc. Security Bulletin
Bulletin Number: #00160
Date: December 3, 1997
Cross-Ref: CERT CA-97.18
The information contained in this Security Bulletin is provided "AS IS."
Sun makes no warranties of any kind whatsoever with respect to the information
contained in this Security Bulletin. ALL EXPRESS OR IMPLIED CONDITIONS,
REPRESENTATIONS AND WARRANTIES, INCLUDING ANY WARRANTY OF NON-INFRINGEMENT OR
IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE
HEREBY DISCLAIMED AND EXCLUDED TO THE EXTENT ALLOWED BY APPLICABLE LAW.
IN NO EVENT WILL SUN MICROSYSTEMS, INC. BE LIABLE FOR ANY LOST REVENUE,
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If any of the above provisions are held to be in violation of applicable law,
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1. Bulletins Topics
Sun announces the release of patches for Solaris 2.5.1, 2.5, 2.4, and
2.3 (SunOS 5.5.1, 5.5, 5.4, and 5.3) which relate to a vulnerability
in the at program.
Sun strongly recommends that you install the patches listed in section 4
immediately on systems running SunOS 5.5.1, 5.5, 5.4, and 5.3.
Exploit information for this vulnerability is publicly available.
2. Who is Affected
Vulnerable: SunOS versions 5.5.1, 5.5.1_x86, 5.5, 5.5_x86,
5.4, 5.4_x86, 5.3
Not vulnerable: All other supported versions of SunOS.
3. Understanding the Vulnerability
The at program allows users to schedule commands to be executed at a
later time. Due to insufficient bounds checking on arguments supplied to
the at program, it is possible to overwrite the internal stack space of
the at program. As the at program is setuid root, this vulnerability may
be exploited to gain root access.
4. List of Patches
The following patches are available in relation to the above problem.
OS version Patch ID
SunOS 5.5.1 103690-05
SunOS 5.5.1_x86 103691-05
SunOS 5.5 103723-05
SunOS 5.5_x86 103724-05
SunOS 5.4 102693-05
SunOS 5.4_x86 102694-05
SunOS 5.3 101572-08
Sun acknowledges with thanks CERT/CC for their assistance in this matter.
A. Patches listed in this bulletin are available to all Sun customers via
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Copyright 1997 Sun Microsystems, Inc. All rights reserved. Sun,
Sun Microsystems, Solaris and SunOS are trademarks or registered trademarks
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Security Bulletin may be reproduced and distributed, provided that this
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