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AUSCERT External Security Bulletin Redistribution
ESB-2013.0091
ESA-2013-003: EMC Avamar Client Elevation of Privilege Vulnerability
22 January 2013
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AusCERT Security Bulletin Summary
---------------------------------
Product: EMC Avamar
Publisher: EMC
Operating System: UNIX variants (UNIX, Linux, OSX)
Impact/Access: Increased Privileges -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2012-2291
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ESA-2013-003: EMC Avamar Client Elevation of Privilege Vulnerability
EMC Identifier: ESA-2013-003
CVE Identifier: CVE-2012-2291
Severity Rating: CVSS v2 Base Score: 6.8 (AV:L/AC:L/Au:S/C:C/I:C/A:C)
Affected Products:
EMC Avamar HP-UX Client 4.x, 5.x and 6.x
EMC Avamar Mac OS Client 4.x, 5.x and 6.x
EMC Avamar Plugin for Oracle 4.x, 5.x and 6.x
Note: Other Linux and Unix Avamar client systems could also be affected as a
result of a support or locally-performed procedure that incorrectly sets the
permission of the Avamar var directory (/usr/local/avamar/var or
/opt/AVMRclnt/var).
Summary:
Due to a vulnerability, described in detail below, the Avamar client leaves
certain directories and files as world writable. The presence of world
writable directories and files may inadvertently result in elevation of
privileges by a user who has access to the local file system.
Details:
The Avamar affected client process runs as root and after each backup it
leaves the cache files as world readable and writable. While the cache files
themselves do not contain sensitive information, when the parent directory is
world-writable, the cache files could be used by an attacker to elevate the
privileges when a system-level backup is performed. The non-root user can
create symbolic links to obtain unauthorized access to files on the affected
system.
Note: This vulnerability information is currently public. EMC is not aware of
any instance in which the vulnerability has been exploited maliciously.
Resolution:
The following workaround steps must be performed to mitigate the risk until
the full fix is available from EMC.
For HP-UX clients:
The permissions of the /opt/AVMRclnt/var directory should be set to 0755.
Log into the HP-UX client as the root user and type the following command:
chmod 0755 /opt/AVMRclnt/var
For Mac OS clients:
The permissions of the /var/avamar directory should be set to 0755.
Log into the Mac client as the root user and type the following command:
chmod 0755 /var/avamar
For Oracle clients:
The following procedure only applies to clients where the directory
permissions of the Avamar var directory (/usr/local/avamar/var or
/opt/AVMRclnt/var) have been manually changed after installation of the Avamar
plugin for Oracle:
The permissions of the /usr/local/avamar/var should be set to 0775 with the
group ownership set to the oracle group. Log into the Oracle client as the root
user and type either of the following pairs of commands:
On Linux and Unix Oracle clients other than Solaris and HP-UX:
chmod 0775 /usr/local/avamar/var
chgrp oracle /usr/local/avamar/var
On Solaris and HP-UX Oracle clients:
chmod 0775 /opt/AVMRclnt/var
chgrp oracle /opt/AVMRclnt/var
Other Avamar clients:
Verify that the permissions of the Avamar var directory (/usr/local/avamar/var
or /opt/AVMRclnt/var) on Linux and Unix clients are not modified as a result
of a support or locally-performed procedure. The permissions should be set to
0755.
If you have any questions or concerns about running the above commands please
contact EMC Technical Support at http://www.emc.com/contact.
Read and use the information in this EMC Security Advisory to assist in
avoiding any situation that might arise from the problems described herein. If
you have any questions regarding this product alert, contact EMC Software
Technical Support at 1-877-534-2867.
Because the view is restricted based on customer agreements, you may not have
permission to view certain downloads. Should you not see a software download
you believe you should have access to, follow the instructions in EMC
Knowledgebase solution emc116045.
For an explanation of Severity Ratings, refer to EMC Knowledgebase solution
emc218831. EMC recommends all customers take into account both the base score
and any relevant temporal and environmental scores which may impact the
potential severity associated with particular security vulnerability.
EMC Corporation distributes EMC Security Advisories, in order to bring to the
attention of users of the affected EMC products, important security
information. EMC recommends that all users determine the applicability of this
information to their individual situations and take appropriate action. The
information set forth herein is provided "as is" without warranty of any kind.
EMC disclaims all warranties, either express or implied, including the
warranties of merchantability, fitness for a particular purpose, title and
non-infringement. In no event, shall EMC or its suppliers, be liable for any
damages whatsoever including direct, indirect, incidental, consequential, loss
of business profits or special damages, even if EMC or its suppliers have been
advised of the possibility of such damages. Some states do not allow the
exclusion or limitation of liability for consequential or incidental damages,
so the foregoing limitation may not apply.
EMC Product Security Response Center
Security_Alert@EMC.COM
http://www.emc.com/contact-us/contact/product-security-response-center.html
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