var-201301-0217
Vulnerability from variot
EMC Avamar Client 4.x, 5.x, and 6.x on HP-UX and Mac OS X, and the EMC Avamar plugin 4.x, 5.x, and 6.x for Oracle, uses world-writable permissions for cache directories, which allows local users to gain privileges via an unspecified symlink attack. EMC Avamar backup client is prone to an insecure file-permissions vulnerability. A local attacker can exploit this issue to gain escalated privileges. This may aid in further attacks. The following versions are affected: EMC Avamar version 4.x EMC Avamar version 5.x EMC Avamar version 6.x. The vulnerability stems from the fact that the cache directory uses world-writable permissions.
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.
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 \x93root\x94 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 \x93root\x94 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 \x93root\x94 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
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"data": "EMC Avamar Client 4.x, 5.x, and 6.x on HP-UX and Mac OS X, and the EMC Avamar plugin 4.x, 5.x, and 6.x for Oracle, uses world-writable permissions for cache directories, which allows local users to gain privileges via an unspecified symlink attack. EMC Avamar backup client is prone to an insecure file-permissions vulnerability. \nA local attacker can exploit this issue to gain escalated privileges. This may aid in further attacks. \nThe following versions are affected:\nEMC Avamar version 4.x\nEMC Avamar version 5.x\nEMC Avamar version 6.x. The vulnerability stems from the fact that the cache directory uses world-writable permissions. \n\n\nSummary: \n\nDue 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. \n\n\nDetails: \n\nThe 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. \n\nNote: This vulnerability information is currently public. \n\n\nResolution: \n\nThe following workaround steps must be performed to mitigate the risk until the full fix is available from EMC. \n\nFor HP-UX clients:\nThe permissions of the /opt/AVMRclnt/var directory should be set to 0755. \nLog into the HP-UX client as the \\x93root\\x94 user and type the following command:\nchmod 0755 /opt/AVMRclnt/var\n\nFor Mac OS clients:\nThe permissions of the /var/avamar directory should be set to 0755. \nLog into the Mac client as the \\x93root\\x94 user and type the following command:\nchmod 0755 /var/avamar\n\nFor Oracle clients:\nThe 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:\nThe 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 \\x93root\\x94 user and type either of the following pairs of commands:\n\nOn Linux and Unix Oracle clients other than Solaris and HP-UX:\n\nchmod 0775 /usr/local/avamar/var\nchgrp oracle /usr/local/avamar/var\n\nOn Solaris and HP-UX Oracle clients:\n\nchmod 0775 /opt/AVMRclnt/var\nchgrp oracle /opt/AVMRclnt/var\n\nOther Avamar clients:\n\nVerify 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. \n\n\nIf you have any questions or concerns about running the above commands please contact EMC Technical Support at http://www.emc.com/contact. \n\n\n\nRead 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. \n\nBecause 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. \n\nFor 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. \n\nEMC 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. 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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.