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AUSCERT External Security Bulletin Redistribution
ESB-2004.0201 -- Sun(sm) Alert Notification - Sun Alert ID: 57508
Multiple Buffer Overflows in "/usr/bin/uucp" May Allow Unauthorized
uucp(1C) User ID Access
11 March 2004
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AusCERT Security Bulletin Summary
---------------------------------
Product: uucp(1C)
Publisher: Sun Microsystems
Operating System: Solaris 9
Solaris 8
Solaris 7
Solaris 2.6
Impact: Root Compromise
Access Required: Existing Account
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DOCUMENT ID: 57508
SYNOPSIS: Multiple Buffer Overflows in "/usr/bin/uucp" May Allow
Unauthorized uucp(1C) User ID Access
DETAIL DESCRIPTION:
Sun(sm) Alert Notification
* Sun Alert ID: 57508
* Synopsis: Multiple Buffer Overflows in "/usr/bin/uucp" May Allow
Unauthorized uucp(1C) User ID Access
* Category: Security
* Product: Solaris
* BugIDs: 4804089, 4756979
* Avoidance: Patch
* State: Resolved
* Date Released: 04-Mar-2004
* Date Closed: 04-Mar-2004
* Date Modified:
1. Impact
Local unprivileged users may be able to gain unauthorized uucp(1C)
user ID access due to multiple buffer overflows in the uucp binary.
Users with uucp(1C) user ID access may subsequently gain unauthorized
"root" user access rights.
2. Contributing Factors
This issue can occur in the following releases:
SPARC Platform
* Solaris 2.6 without patch 106468-06
* Solaris 7 without patch 106952-04
* Solaris 8 without patch 111570-03
* Solaris 9 without patch 113322-02
x86 Platform
* Solaris 2.6 without patch 106469-06
* Solaris 7 without patch 106953-04
* Solaris 8 without patch 111571-03
* Solaris 9 without patch 115880-01
3. Symptoms
There are no symptoms that would indicate the described issue has been
exploited to gain unauthorized uucp(1C) or root user ID access to a
system.
SOLUTION SUMMARY:
4. Relief/Workaround
To work around the described issue, remove the set-user-ID bit from
the uucp binary by issuing the following command:
# chmod u-s /usr/bin/uucp
Note: Removing the set-user-ID bit from the uucp binary will prevent
unprivileged users from using the "uucp" command to access calling
devices (i.e. modems).
Another option is to set "noexec_user_stack" options to defeat the
most common form of buffer overflow attacks that store executable
exploit code on the stack. This can be achieved by editing the
"/etc/system" file and adding the lines:
set noexec_user_stack = 1
set noexec_user_stack_log = 1
Note: A reboot will be necessary in order for the "/etc/system" change
to take effect.
5. Resolution
This issue is addressed in the following releases:
SPARC Platform
* Solaris 2.6 with patch 106468-06 or later
* Solaris 7 with patch 106952-04 or later
* Solaris 8 with patch 111570-03 or later
* Solaris 9 with patch 113322-02 or later
x86 Platform
* Solaris 2.6 with patch 106469-06 or later
* Solaris 7 with patch 106953-04 or later
* Solaris 8 with patch 111571-03 or later
* Solaris 9 with patch 115880-01 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 2000-2004 Sun Microsystems, Inc., 4150 Network Circle, Santa
Clara, CA 95054 U.S.A. All rights reserved.
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