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__________________________________________________________
The U.S. Department of Energy
Computer Incident Advisory Capability
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INFORMATION BULLETIN
SunOS, Solaris libX11 Buffer Overflow Vulnerability
September 17, 1997 22:00 GMT Number H-108
______________________________________________________________________________
PROBLEM: A vulnerability exists in libX11, a library in the X Windows
system.
PLATFORM: Solaris 2.5.1, 2.5, 2.4, and 2.3 (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)
DAMAGE: The buffer overflow vulnerabilities may be exploited through
setuid and setgid programs that link libX11 to increase
privileges, including root privileges.
SOLUTION: Apply patches as listed in Section 4.
______________________________________________________________________________
VULNERABILITY Sun strongly recommends that you install the patches listed in
ASSESSMENT: 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.
______________________________________________________________________________
[ Start Sun Microsystems Advisory ]
______________________________________________________________________________
Sun Microsystems, Inc. Security Bulletin
Bulletin Number: #00154
Date: September 17, 1997
Cross-Ref:
Title: libX11
______________________________________________________________________________
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 vulnerabilities in libX11.
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 vulnerabilities are fixed in Solaris 2.6.
3. Understanding the Vulnerabilities
libX11 is a library in the X Windows system. There are several buffers
in libX11 that may be overflowed. The buffer overflow vulnerabilities may
be exploited through setuid and setgid programs that link libX11 to
increase privileges, including root privileges.
4. List of Patches
The vulnerabilities in libX11 are fixed by the following patches:
OS version Patch ID
__________ ________
SunOS 5.5.1 103566-21
SunOS 5.5.1_x86 104241-03
SunOS 5.5 103210-21
SunOS 5.5_x86 104242-02
SunOS 5.4 102057-41
SunOS 5.4_x86 103185-02
SunOS 5.3 101362-51
SunOS 4.1.4 100899-03
SunOS 4.1.3_U1 100899-03
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 4.1.x: /usr/5bin/sum;
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
_______________ _________ __________ ________________________________
103566-21.tar.Z 58014 3555 65069 7109 9957BF7423D147E9CFAF877DF637A603
104241-03.tar.Z 11512 1450 52051 2899 C33B8EFD96A7BD22E07582E3C575669D
103210-21.tar.Z 13372 3651 11073 7301 619130609DBE46F7FFECAE89631E3A52
104242-02.tar.Z 55147 1415 30132 2830 83988AADB844139C744D3B81D4B2774F
102057-41.tar.Z 55014 2668 32935 5335 FDE4A6372ACA7CFD62F22DE4F424DEB2
103185-02.tar.Z 59698 1010 62623 2019 23B70F3AEBD6F0462053042FFC29E806
101362-51.tar.Z 26563 6475 50012 12949 B1F06E68F57745CC27328CFB88273349
100899-03.tar.Z 58461 417 51033 833 08C7D7AFFDE39C809F540BD907AA660B
______________________________________________________________________________
Sun acknowledges with thanks Marko Laakso (University of Oulu, Finland)
for his assistance in the preparation of this bulletin.
______________________________________________________________________________
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. Sun Security Coordination Team's PGP key is available via World Wide Web
at:
<URL:http://sunsolve1.sun.com/sunsolve/secbulletins/SunSCkey.txt>
D. 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
E. To receive information or subscribe to our CWS (Customer Warning System)
mailing list, send email to:
security-alert@sun.com
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Note that your-email-address should be substituted
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______________________________________________________________________________
[ End Sun Microsystems Advisory ]
______________________________________________________________________________
CIAC wishes to acknowledge the contributions of Sun Microsystems, Inc for the
information contained in this bulletin.
______________________________________________________________________________
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