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

EntryeditHistoryDiffjsonxmlCTI
CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.9$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 vulnerability. CWE is classifying the issue as CWE-611. 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.

It is declared as proof-of-concept. The exploit is shared for download at exploit-db.com. 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 local. 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 SecurityFocus (BID 105474) and Tenable (118094). The entries 125127 and 125129 are related to this item.

Productinfoedit

Type

Vendor

Name

CPE 2.3infoedit

CPE 2.2infoedit

CVSSv3infoedit

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 4.9

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

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2infoedit

AVACAuCIA
🔍🔍🔍🔍🔍🔍
🔍🔍🔍🔍🔍🔍
🔍🔍🔍🔍🔍🔍
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
unlockunlockunlockunlockunlockunlock
unlockunlockunlockunlockunlockunlock
unlockunlockunlockunlockunlockunlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfoedit

Class: XML External Entity
CWE: CWE-611
ATT&CK: Unknown

Local: No
Remote: Yes

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

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Dayunlockunlockunlockunlock
Todayunlockunlockunlockunlock

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 Intelligenceinfoedit

Threat: 🔍
Adversaries: 🔍
Geopolitics: 🔍
Economy: 🔍
Predictions: 🔍
Remediation: 🔍

Countermeasuresinfoedit

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Patch: portal.msrc.microsoft.com

Timelineinfoedit

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 🔍
04/01/2020 +537 days 🔍

Sourcesinfoedit

Vendor: https://www.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

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

Entryinfoedit

Created: 10/10/2018 12:56 PM
Updated: 04/01/2020 09:26 AM
Changes: (10) vulnerability_discoverydate advisory_person_name advisory_person_nickname advisory_confirm_url exploit_availability exploit_publicity exploit_url source_cve_assigned source_securityfocus_date source_securityfocus_class
Complete: 🔍

Comments

No comments yet. Please log in to comment.

Do you want to use VulDB in your project?

Use the official API to access entries easily!