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[ For Public Release ]
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The U.S. Department of Energy
Computer Incident Advisory Capability
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INFORMATION BULLETIN
SunOS Vulnerability in x-lock
(Update to Bulletin H-54, Vulnerability in x-lock)
August 13, 1997 19:00 GMT Number H-95
______________________________________________________________________________
PROBLEM: A buffer overflow condition exists in some implementations of
xlock.
PLATFORM: Solaris 2.x, SunOS 4.1.4, 4.1.3_U1, SunOS 5.x.
DAMAGE: Local users may gain root privileges.
SOLUTION: Apply patches listed below.
______________________________________________________________________________
VULNERABILITY Exploit information involving this vulnerability has been made
ASSESSMENT: publicly available. Sun STRONGLY RECOMMENDS that you install
the patches immediately.
______________________________________________________________________________
[ Start Sun Microsystems Advisory ]
______________________________________________________________________________
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
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______________________________________________________________________________
[End Sun Microsystems Advisory ]
______________________________________________________________________________
CIAC wishes to acknowledge the contributions of Sun Microsystems for the
information contained in this bulletin.
______________________________________________________________________________
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