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Category:   Application (Database)  >   Microsoft SQL Server Vendors:   Microsoft
Microsoft SQL Server XML External Entity Processing Flaws Let Remote Users Obtain Potentially Sensitive Information
SecurityTracker Alert ID:  1041826
SecurityTracker URL:  http://securitytracker.com/id/1041826
CVE Reference:   CVE-2018-8527, CVE-2018-8532, CVE-2018-8533   (Links to External Site)
Date:  Oct 9 2018
Impact:   Disclosure of system information, Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): SQL Server Management Studio 17.9, SQL Server Management Studio 18.0 (Preview 4)
Description:   Several vulnerabilities were reported in Microsoft SQL Server. A remote user can conduct XML external entity attacks to obtain files on the target system.

A remote user can supply specially crafted XEL file on the Microsoft SQL Server Management Studio (SSMS) that, when loaded by the target user, will read arbitrary files via an XML external entity declaration [CVE-2018-8527].

A remote user can supply specially crafted XMLA file that, when loaded by the target user, will read arbitrary files via an XML external entity declaration [CVE-2018-8532].

A remote user can supply specially crafted XML file that, when loaded by the target user, will read arbitrary files via an XML external entity declaration [CVE-2018-8533].

John Page (aka hyp3rlinx) - ApparitionSec (via Trend Micro's Zero Day Initiative) reported these vulnerabilities.

Impact:   A remote user can read files on the target system with the privileges of the target service.
Solution:   The vendor has issued a fix.

The Microsoft advisories are available at:

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8527
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8532
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8533

Vendor URL:  portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8527 (Links to External Site)
Cause:   Access control error
Underlying OS:  Windows (Any)

Message History:   None.


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