ESB-2017.2439 - [Win][Linux] EMC Data Protection Advisor: Execute arbitrary code/commands - Existing account 2017-09-27

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.2439
        EMC Data Protection Advisor ScheduledReportResource Command
               Injection Remote Code Execution Vulnerability
                             27 September 2017

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           EMC Data Protection Advisor
Publisher:         Zero Day Initiative
Operating System:  Windows
                   Linux variants
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
                   Denial of Service               -- Existing Account
Resolution:        Mitigation
CVE Names:         CVE-2017-10955  

Original Bulletin: 
   http://www.zerodayinitiative.com/advisories/ZDI-17-812/

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EMC Data Protection Advisor ScheduledReportResource Command Injection Remote 
Code Execution Vulnerability

ZDI-17-812: September 26th, 2017

CVE ID

CVE-2017-10955

CVSS Score

9, (AV:N/AC:L/Au:S/C:C/I:C/A:C)

Affected Vendors

EMC

Affected Products

Data Protection Advisor

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on 
vulnerable installations of EMC Data Protection Advisor. Authentication is 
required to exploit this vulnerability.

The specific flaw exists within the EMC DPA Application service, which listens
on TCP port 9002 by default. When parsing the preScript parameter, the process
does not properly validate a user-supplied string before using it to execute a
system call. An attacker can leverage this vulnerability to execute arbitrary
code under the context of SYSTEM.

Vendor Response

EMC states:

This vulnerability is being disclosed publicly without a patch in accordance 
with the ZDI 120 day deadline.

04/12/2017 - ZDI disclosed the report to the vendor

04/14/2017 - The vendor acknowledged the report as PSRC-4399

05/09/2017 - The vendor responded that 'an intial design flaw of the product 
and not a vulnerability. If further details are provided then the product team
will investigate further into this issue.'

06/27/2017 - ZDI met with the vendor by phone to discuss (multiple cases). We
left thinking the vendor wanted more time to revisit the report

08/25/2017 - The vendor again advised ZDI that: The product team did not see 
this as an issue as the product is functioning by design

09/15/2017 - ZDI advised the vendor that this report will 0-day on 9/26

09/25/2017 - The vendor replied to ZDI and reiterated the position that this 
is 'by design.'

- -- Mitigation:

Given the nature of the vulnerability, the only salient mitigation strategy is
to restrict interaction with the service to trusted machines. Only the clients
and servers that have a legitimate procedural relationship with the service 
should be permitted to communicate with it. This could be accomplished in a 
number of ways, most notably with firewall rules/whitelisting. These features
are available in the native Windows Firewall, as described in 
http://technet.microsoft.com/en-us/library/cc725770%28WS.10%29.aspx and 
numerous other Microsoft Knowledge Base articles.

Disclosure Timeline

2017-04-12 - Vulnerability reported to vendor

2017-09-26 - Coordinated public release of advisory

Credit

This vulnerability was discovered by:

rgod

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