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Adobe Version Cue VCNative Multiple Vulnerabilities (Privileges
Escalation, Symlink Attack)
------------------------------------------------------------------------
SUMMARY
" <http://www.adobe.com/products/creativesuite/versioncue.html> Adobe
Version Cue is a software version tracking system for Adobe products
distributed with Adobe Creative Suite and select Adobe products."
Lack of proper parameter checking and random name supplying allow
attackers to gain root privileges and perform a symlink attack using Adobe
Version Cue VCNative.
DETAILS
Vulnerable Systems:
* Adobe Version Cue version 1 on the Apple OS X platform
Privileges Escalation:
Local exploitation of a design error in Adobe's Version Cue allows local
attackers to gain root privileges. Version Cue includes a setuid root
application named VCNative which contains a design error that allows local
attackers to gain root privileges. The vulnerability specifically exists
due to an unchecked command line option parameter.
The "-lib" command line option allows users to specify library "bundles"
which allows for the introduction of arbitrary code in the context of a
root owned process. The init function in a shared library is executed
immediately upon loading. By utilizing the "-lib" argument to load a
malicious library, local attackers can execute arbitrary code with root
privileges.
Successful exploitation allows local attackers to write to arbitrary files
with user-supplied data. Data written to the linked file will include some
corrupted data as well as user-supplied data, potentially corrupting a
file completely and preventing the execution of system commands. In
addition, a carefully crafted input value can be used in conjunction with
standard system tools such as cron to gain root privileges.
Symlink Attack:
Local exploitation of a design error in Adobe Systems, Inc. Version Cue
allows local attackers to gain root privileges. Version Cue includes a
setuid root application named VCNative which is vulnerable to a symlink
attack. The vulnerability specifically exists due to the use of
predictable log file names. VCNative uses a format such as
"VCNative-[pid].log" for the filename and stores the file in the current
working directory. Attackers can easily predict the created filename and
supply user-controlled data via the "-host" and "- port" options. A
carefully supplied value can cause a crafted "log file" to be written.
Crafted strings written to root-owned files can lead to arbitrary code
execution with root privileges.
Successful exploitation allows local attackers to write to arbitrary files
with user-supplied data. Data written to the linked file will include some
corrupted data as well as user-suppplied data, potentially corrupting a
file completely and preventing the execution of system commands. In
addition, a carefully crafted input value can be used in conjunction with
standard system tools such as cron to gain root privileges.
Workaround:
Remove the setuid bit from the VCNative binary and execute the application
as a root.
Vendor Status:
The vendor has issued a fix for the vulnerabilities. For more information
see: <http://www.adobe.com/support/downloads/detail.jsp?ftpID=2985>
http://www.adobe.com/support/downloads/detail.jsp?ftpID=2985
CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1842>
CAN-2005-1842
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1843>
CAN-2005-1843
Disclosure Timeline:
06/27/2005 Initial vendor notification
06/27/2005 Initial vendor response
08/29/2005 Public disclosure
ADDITIONAL INFORMATION
The information has been provided by
<mailto:idlabs-advisories@lists.idefense.com> iDEFENSE Labs.
The original article can be found at:
<http://www.idefense.com/application/poi/display?id=296&type=vulnerabilities>
http://www.idefense.com/application/poi/display?id=296&type=vulnerabilities,
<http://www.idefense.com/application/poi/display?id=297&type=vulnerabilities>
http://www.idefense.com/application/poi/display?id=297&type=vulnerabilities
The vendor advisory can be found at:
<http://www.adobe.com/support/techdocs/327129.html>
http://www.adobe.com/support/techdocs/327129.html
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