ESA-2016-065: EMC Avamar Data Store and Avamar Virtual Edition Multiple Vulnerabilities

[EMC Product Security Response Center <Security_Alert@xxxxxxx>]

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ESA-2016-065: EMC Avamar Data Store and Avamar Virtual Edition Multiple 
Vulnerabilities

EMC Identifier: ESA-2016-065
CVE Identifier: CVE-2016-0903, CVE-2016-0904, CVE-2016-0905, CVE-2016-0920, 
CVE-2016-0921
Severity Rating: See below for individual scores for each CVE

Affected products:  
?       EMC Avamar Data Store (ADS) and Avamar Virtual Edition (AVE) versions 
prior to 7.3.0

Summary:  
EMC Avamar Data Store (ADS) and Avamar Virtual Edition (AVE) 7.3 contain fixes 
for multiple vulnerabilities.  These vulnerabilities may expose the Avamar 
clients and servers to potentially be compromised by malicious users.

Details:

The following vulnerabilities were addressed in EMC Avamar 7.3 versions:

1.      Improper client side authentication (CVE-2016-0903)
Certain communications between Avamar client and Avamar Server were using a 
weak authentication scheme. An attacker could impersonate an Avamar client 
agent to restore affected clients? backup data from the server. All agent and 
server communications are now authenticated using certificate-based 
authentication. See the Product Security Guide for more details.

CVSSv3 Base Score: 8.1 (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)

2.      Improper encryption of communication channel (CVE-2016-0904)
The communication between Avamar agent and Avamar server was encrypted using 
static keys.  An attacker with knowledge of the static keys could potentially 
eavesdrop on this communication. Communication is now protected using 
certificates uniquely generated during server installation and client 
registration. See the Product Security Guide for more details.

CVSSv3 Base Score: 7.0 (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L)

3.      Privilege escalation via sudo (CVE-2016-0905)
Avamar admin level user is able to gain root privileges on the node using sudo 
command without providing root credentials.

CVSSv3 Base Score: 6.7 (AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H)


4.      Command Injection in sudo script (CVE-2016-0920)
A certain command accessible via sudo is vulnerable to a command injection when 
parsing its parameters. A malicious Avamar user can pass specially crafted 
parameter and execute commands as root.

CVSSv3 Base Score: 6.7 (AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H)

5.      Privilege escalation due to weak file permissions (CVE-2016-0921)
Weak permissions for certain Avamar directories may allow Avamar admin user to 
replace affected directories and scripts with their own and execute them with 
root privileges. 

CVSSv3 Base Score: 6.7 (AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H)



Resolution:  
The following EMC Avamar release contains resolutions to all these 
vulnerabilities

?       Avamar Server Version 7.3.0-233

EMC recommends all customers upgrade at the earliest opportunity. 

Link to remedies:

To upgrade your EMC Avamar system, contact your account representative or EMC 
Remote Proactive Customer Support at https://support.emc.com and refer to this 
article number.

Credits:

EMC would like to thank the following individuals for reporting issues 
described in this advisory:
?       Jakub Mleczko from the security team from Orange Poland (CVE-2016-0903 
and CVE-2016-0904) 
?       Jack Baker from Northrop Grumman (CVE-2016-0920)
?       Geoffrey Janjua from Northrop Grumman (CVE-2016-0921)

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.

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 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.

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