Microsoft SQL Server Management Studio 17.9/18.0 Preview 4 XEL File xml external entity reference

CVSS Meta Temp Score
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CTI Interest Score
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5.1$0-$5k0.00

A vulnerability was found in Microsoft SQL Server Management Studio 17.9/18.0 Preview 4 (Database Software). It has been classified as critical. Affected is some unknown processing of the component XEL File Handler. The manipulation with an unknown input leads to a xml external entity reference vulnerability. CWE is classifying the issue as CWE-611. The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output. This is going to have an impact on confidentiality, integrity, and availability.

The bug was discovered 10/09/2018. The weakness was shared 10/09/2018 by John Page (hyp3rlinx) as confirmed security update guide (Website). The advisory is shared for download at portal.msrc.microsoft.com. The vendor cooperated in the coordination of the public release. This vulnerability is traded as CVE-2018-8527 since 03/14/2018. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. Technical details are unknown but a public exploit is available. The advisory points out:

An information disclosure vulnerability exists in Microsoft SQL Server Management Studio (SSMS) when parsing a malicious XEL file containing a reference to an external entity. An attacker who successfully exploited this vulnerability could read arbitrary files via an XML external entity declaration.

The exploit is shared for download at exploit-db.com. It is declared as proof-of-concept. As 0-day the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 118094 (Microsoft SQL Server Management Studio Multiple vulnerabilities (October 2018)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 91476 (Microsoft SQL Server Management Studio Information Disclosure Vulnerability Update for October 2018).

Applying a patch is able to eliminate this problem. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Exploit-DB (45585), Tenable (118094) and SecurityFocus (BID 105474†).

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
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CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 4.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Xml external entity reference
CWE: CWE-611 / CWE-610
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 118094
Nessus Name: Microsoft SQL Server Management Studio Multiple vulnerabilities (October 2018)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
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Timelineinfo

03/14/2018 🔍
10/09/2018 +208 days 🔍
10/09/2018 +0 days 🔍
10/09/2018 +0 days 🔍
10/09/2018 +0 days 🔍
10/10/2018 +1 days 🔍
10/10/2018 +0 days 🔍
10/12/2018 +2 days 🔍
05/23/2023 +1684 days 🔍

Sourcesinfo

Vendor: microsoft.com

Advisory: portal.msrc.microsoft.com
Researcher: John Page (hyp3rlinx)
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2018-8527 (🔍)
SecurityFocus: 105474 - Microsoft SQL Server Management Studio CVE-2018-8527 Information Disclosure Vulnerability
SecurityTracker: 1041826

scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 10/10/2018 12:56 PM
Updated: 05/23/2023 03:40 PM
Changes: 10/10/2018 12:56 PM (74), 04/01/2020 09:26 AM (10), 05/23/2023 03:40 PM (5)
Complete: 🔍
Cache ID: 98:78E:40

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