VDB-130828 · CVE-2019-0686 · BID 106937

Microsoft Exchange Server 2010 SP3/2013 CU22/2016 CU12/2019 CU1 EWS access control

CVSS Meta Temp Score
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CTI Interest Score
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6.4$0-$5k0.00

Summaryinfo

A vulnerability described as critical has been identified in Microsoft Exchange Server 2010 SP3/2013 CU22/2016 CU12/2019 CU1. Impacted is an unknown function of the component EWS. Executing a manipulation can lead to access control. This vulnerability appears as CVE-2019-0686. The attack may be performed from remote. There is no available exploit. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability has been found in Microsoft Exchange Server 2010 SP3/2013 CU22/2016 CU12/2019 CU1 (Groupware Software) and classified as critical. This vulnerability affects an unknown code block of the component EWS. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-264. As an impact it is known to affect confidentiality, integrity, and availability.

The bug was discovered 02/12/2019. The weakness was presented 02/12/2019 as confirmed security update guide (Website). The advisory is shared for download at portal.msrc.microsoft.com. The public release was coordinated in cooperation with the vendor. This vulnerability was named CVE-2019-0686 since 11/26/2018. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1068. The advisory points out:

An elevation of privilege vulnerability exists in Microsoft Exchange Server. An attacker who successfully exploited this vulnerability could gain the same rights as any other user of the Exchange server. This could allow the attacker to perform activities such as accessing the mailboxes of other users.

The commercial vulnerability scanner Qualys is able to test this issue with plugin 53021 (Microsoft Windows Exchange Server Update for February 2019 (ADV190007)(ADV190004)).

Applying a patch is able to eliminate this problem. It is possible to mitigate the problem by applying the configuration setting New-ThrottlingPolicy -Name AllUsersEWSSubscriptionBlockPolicy -EwsMaxSubscriptions 0 -ThrottlingPolicyScope Organization. The best possible mitigation is suggested to be patching the affected component. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 106937†). See VDB-131330 for similar entry. Once again VulDB remains the best source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.4

VulDB Base Score: 5.6
VulDB Temp Score: 5.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.4
NVD Vector: 🔍

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
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Exploitinginfo

Class: Access control
CWE: CWE-264
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
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Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Config: New-ThrottlingPolicy -Name AllUsersEWSSubscriptionBlockPolicy -EwsMaxSubscriptions 0 -ThrottlingPolicyScope Organization

Timelineinfo

11/26/2018 🔍
02/12/2019 +78 days 🔍
02/12/2019 +0 days 🔍
02/12/2019 +0 days 🔍
02/12/2019 +0 days 🔍
02/13/2019 +1 days 🔍
07/10/2023 +1608 days 🔍

Sourcesinfo

Vendor: microsoft.com

Advisory: portal.msrc.microsoft.com
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2019-0686 (🔍)
GCVE (CVE): GCVE-0-2019-0686
GCVE (VulDB): GCVE-100-130828
SecurityFocus: 106937 - Microsoft Exchange Server CVE-2019-0686 Remote Privilege Escalation Vulnerability

See also: 🔍

Entryinfo

Created: 02/13/2019 10:18
Updated: 07/10/2023 08:52
Changes: 02/13/2019 10:18 (65), 05/10/2020 09:59 (5), 07/10/2023 08:52 (4)
Complete: 🔍
Cache ID: 216::103

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