Published:
13 August 1997
Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-97.104 -- Sun Security Bulletin #00150
Vulnerability in xlock
14 August 1997
===========================================================================
Sun Microsystems, Inc has released the following advisory concerning a
vulnerability in xlock. This vulnerability may allow local users to gain
root privileges.
The following security bulletin is provided as a service to AUSCERT's
members. As AUSCERT did not write this document, AUSCERT has had no
control over its content. As such, the decision to use any or all of this
information is the responsibility of each user or organisation, and should
be done so in accordance with site policies and procedures.
Contact information for Sun Microsystems, Inc is included in the Security
Bulletin below. If you have any questions or need further information,
please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
http://www.auscert.org.au/information/advisories.html
If you believe that your system has been compromised, contact AUSCERT or
your representative in FIRST (Forum of Incident Response and Security
Teams).
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 4477
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AUSCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for emergencies.
- ---------------------------BEGIN INCLUDED TEXT----------------------------------
________________________________________________________________________________
Sun Microsystems, Inc. Security Bulletin
Bulletin Number: #00150
Date: August 12, 1997
Cross-Ref: CERT CA-97.13
Title: Vulnerability in xlock
________________________________________________________________________________
Permission is granted for the redistribution of this Bulletin, so long as
the Bulletin is not edited and is attributed to Sun Microsystems. Portions
may also be excerpted for re-use in other security advisories so long as
proper attribution is included.
Any other use of this information without the express written consent of
Sun Microsystems is prohibited. Sun Microsystems expressly disclaims all
liability for any misuse of this information by any third party.
________________________________________________________________________________
1. Bulletins Topics
Sun announces the release of patches for Solaris 2.5.1, 2.5, 2.4, 2.3,
(SunOS 5.5.1, 5.5, 5.4, 5.3), SunOS 4.1.4, and 4.1.3_U1, which relate
to a vulnerability in the xlock 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, 5.3, 4.1.4, and
4.1.3_U1. Exploit information 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, 4.1.4, and 4.1.3_U1
The vulnerability is fixed in the upcoming release of Solaris.
3. Understanding the Vulnerability
The xlock program locks the local X display until the user supplies a
password. Due to insufficient bounds checking on arguments supplied to
xlock it is possible to overwrite the stack space of the xlock program.
As xlock is setuid root, this vulnerability may be exploited by users on
a system to gain root access.
4. List of Patches
The vulnerability in xlock is fixed by the following patches:
OS version Patch ID
__________ ________
SunOS 5.5.1 103566-20
SunOS 5.5.1_x86 105109-01
SunOS 5.5 103210-20
SunOS 5.5_x86 105108-01
SunOS 5.4 102057-38
SunOS 5.4_x86 105110-01
SunOS 5.3 101362-50
SunOS 4.1.4 100478-02
SunOS 4.1.3_U1 100478-02
5. Checksum Table
The checksum table below shows the BSD checksums (SunOS 4.1.x: /bin/sum;
SunOS 5.x: /usr/ucb/sum), SVR4 checksums (SunOS 5.x: /usr/bin/sum), and
the MD5 digital signatures for the above-mentioned patches that are
available from:
<URL:ftp://sunsolve1.sun.com/pub/patches/patches.html>
These checksums may not apply if you obtain patches from your answer
centers.
File Name BSD SVR4 MD5
_______________ _________ __________ _______________________________
103566-20.tar.Z 01319 3189 4044 6378 D7534B10A32CC600972973B39850A622
105109-01.tar.Z 44172 144 14499 287 16CEC591C71EE814E8475EC62EAF2903
103210-20.tar.Z 45065 3270 36740 6540 E413A4D5CD4A43F3ACDDDF3E78628099
105108-01.tar.Z 55743 143 43259 286 8EA202FF2C7D2FEA47424FBA53F11FA2
102057-38.tar.Z 09646 1909 60808 3817 D3C1FEB1C242DDD68BAA4F56DB70CD3F
105110-01.tar.Z 05813 130 30121 260 2CE9A43C4F38D787AFAAE92E57287553
101362-50.tar.Z 12142 6482 58259 12964 887B3277462D9051D4630C7A753855C3
100478-02.tar.Z 09802 60 47925 120 1981F145B09AAAC7B73193FF82DDF8D5
_______________________________________________________________________________
APPENDICES
A. Patches listed in this bulletin are available to all Sun customers via
World Wide Web at:
<URL:ftp://sunsolve1.sun.com/pub/patches/patches.html>
Customers with Sun support contracts can also obtain patches from local
Sun answer centers and SunSITEs worldwide.
B. Sun security bulletins are available via World Wide Web at:
<URL:http://sunsolve1.sun.com/sunsolve/secbulletins>
C. To report or inquire about a security problem with Sun software, contact
one or more of the following:
- Your local Sun answer centers
- Your representative computer security response team, such as CERT
- Sun Security Coordination Team. Send email to:
security-alert@sun.com
D. To receive information or subscribe to our CWS (Customer Warning System)
mailing list, send email to:
security-alert@sun.com
with a subject line (not body) containing one of the following commands:
Command Information Returned/Action Taken
_______ _________________________________
help An explanation of how to get information
key Sun Security Coordination Team's PGP key
list A list of current security topics
query [topic] The email is treated as an inquiry and is forwarded to
the Security Coordination Team
report [topic] The email is treated as a security report and is
forwarded to the Security Coordinaton Team. Please
encrypt sensitive mail using Sun Security Coordination
Team's PGP key
send topic A short status summary or bulletin. For example, to
retrieve a Security Bulletin #00138, supply the
following in the subject line (not body):
send #138
subscribe Sender is added to our mailing list. To subscribe,
supply the following in the subject line (not body):
subscribe cws your-email-address
Note that your-email-address should be substituted
by your email address.
unsubscribe Sender is removed from the CWS mailing list.
________________________________________________________________________________
- ------BEGIN PGP SIGNATURE-----
Version: 2.6.2
iQCVAwUBM/CvV7dzzzOFBFjJAQHPIQP/Rp3mc1po79HR9hSx4yfAToNOszMCtBJj
JeUWSEAL89Y01+eMmqtez2GATLEOVCAkUy+9isLXhEiAmNYgeHBRZeanFWFph1k3
kRWGHJQdlcI1BsLgGZVEE2IDQHCwh64tPnekVTJZvKFXs+ZcDHQ+YvAwW62UXuqW
wJS8PA2o9N0=
=umGq
- ------END PGP SIGNATURE-----
- ------BEGIN PGP SIGNED MESSAGE-----
- ---------------------------END INCLUDED TEXT--------------------
-----BEGIN PGP SIGNATURE-----
Version: 2.6.3i
Charset: noconv
Comment: ftp://ftp.auscert.org.au/pub/auscert/AUSCERT_PGP.key
iQCVAwUBM/g22Ch9+71yA2DNAQFZLgP/Xg1XpX6VXJZ8laoLox72MuVrDpFh1gH9
3hNYPXxjogOvTjnyz/WbvqBocPKk/9H+05+lv0AB+gF2WM0L6N9BN3ckRZR4nw/u
QHfiRDAjHC1UjbpMnn9Rn+p4ZW9GW+cLd2dV17OpRzWrAQ4vNL2mSDhg8Nueh3m0
MNFA9r62iZQ=
=8zEi
-----END PGP SIGNATURE-----