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The U.S. Department of Energy
Computer Incident Advisory Capability
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INFORMATION BULLETIN
Sun Linux Vulnerabilities in "unzip" and GNU "tar" Commands
[Sun Alert ID: 47800 ]
February 7, 2003 13:00 GMT Number N-041
______________________________________________________________________________
PROBLEM: Vulnerabilities have been identified in "unzip" and GNU "tar"
Commands. Directory traversal vulnerability in Info-ZIP UnZip
5.42 and earlier allows attackers to overwrite arbitrary files
during archive extraction via a .. (dot dot) in an extracted
filename.
PLATFORM: Sun Linus
Sun Linux 5.0 with tar 1.13.19-6
Sun Linux 5.0 with unzip version 5.42 or earlier
Sun Linux 5.0 with GNU tar 1.13.19 or earlier
Cobalt
Qube 3
RaQ 3
RaQ 4
RaQ 550
RaQ XTR
DAMAGE: A local unprivileged user may be able to gain unauthorized root
access and/or overwrite any file on the system.
SOLUTION: Apply available patches, upgrades, or workarounds.
______________________________________________________________________________
VULNERABILITY The risk is MEDIUM. There are no reliable symptoms that would
ASSESSMENT: show the described issue has been exploited to gain unauthorized
root access to a system.
______________________________________________________________________________
LINKS:
CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/n-041.shtml
ORIGINAL BULLETIN:
http://sunsolve.sun.com/pub-cgi/retrieve.pl?doc=fsalert%
2F47800&zone_32=category%3Asecurity
PATCHES: http://sunsolve.sun.com/patches/linux/security.html
http://sunsolve.sun.com/patches/cobalt/
______________________________________________________________________________
[***** Start Sun Alert ID: 47800 *****]
Sun Alert ID: 47800
Synopsis: Sun Linux Vulnerabilities in "unzip" and GNU "tar" Commands
Category: Security
Product: Sun Linux
BugIDs: 16170
Avoidance: Workaround, Patch, Upgrade
State: Resolved
Date Released: 10-Oct-2002, 04-Feb-2003
Date Closed: 04-Feb-2003
Date Modified: 04-Feb-2003
1. Impact
A local unprivileged user may be able to gain unauthorized root access and/or
overwrite any file on the system if a privileged user extracts a tar or zip archive
which contains a ".." (dot dot) in the filename.
For more information see:
http://online.securityfocus.com/archive/1/196445
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2001-1267
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2001-1268
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2001-1269
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0399
2. Contributing Factors
This issue can occur in the following releases:
Sun Linux
Sun Linux 5.0 with tar 1.13.19-6
Sun Linux 5.0 with unzip version 5.42 or earlier
Sun Linux 5.0 with GNU tar 1.13.19 or earlier
Note: Sun Linux 5.0 is currently shipped with the Sun LX50 Server.
Cobalt
Qube 3
RaQ 3
RaQ 4
RaQ 550
RaQ XTR
3. Symptoms
There are no reliable symptoms that would show the described issue has been exploited
to gain unauthorized root access to a system.
Solution Summary Top
4. Relief/Workaround
Verify zip or tar archives using the options as follows:
tar -tvf <tarfile>.tar
Or for compressed files:
tar -tvzf <tarfile>.tar.<gz|zip|Z|z>
Or for zip files:
unzip -l <zipfile>.zip
If multiple "../" entries are not present, the archive is safe.
5. Resolution
This issue is addressed in the following releases:
Sun Linux
Sun Linux 5.0 tar-1.13.25-4.7.1.i386.rpm
Sun Linux 5.0 unzip-5.50-2.i386.rpm
Sun Linux 5.0 tar-1.13.25-4.7.1.src.rpm
Sun Linus 5.0 unzip-5.50-2.src.rpm
The above patches are available at:
http://sunsolve.sun.com/patches/linux/security.html
Cobalt
Qube3-All-Security-4.0.1-16170.pkg
RaQ3-All-Security-5.0.1-16170.pkg
RaQ4-All-Security-2.0.2-16170.pkg
RaQ550-All-Security-0.0.1-16170.pkg
RaQXTR-All-Security-1.0.1-16170.pkg
The above patches are available at http://sunsolve.sun.com/patches/cobalt/.
Change History
04-Feb-2003:
State Resolved (and Closed)
Updated Contributing Factors and Resolution sections
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
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Copyright 2000-2003 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, CA 95054
U.S.A. All rights reserved.
[***** End Sun Alert ID: 47800 *****]
_______________________________________________________________________________
CIAC wishes to acknowledge the contributions of Sun Microsystems for the
information contained in this bulletin.
_______________________________________________________________________________
CIAC, the Computer Incident Advisory Capability, is the computer
security incident response team for the U.S. Department of Energy
(DOE) and the emergency backup response team for the National
Institutes of Health (NIH). CIAC is located at the Lawrence Livermore
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