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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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