Microsoft Exchange Server up to 2017 CU8 Outlook Web Access information disclosure

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

Summaryinfo

A vulnerability has been found in Microsoft Exchange Server up to 2017 CU8 and classified as problematic. This vulnerability affects unknown code of the component Outlook Web Access. Performing a manipulation results in information disclosure. This vulnerability is cataloged as CVE-2018-0924. It is possible to initiate the attack remotely. There is no exploit available. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability classified as problematic has been found in Microsoft Exchange Server up to 2017 CU8 (Groupware Software). This affects an unknown part of the component Outlook Web Access. The manipulation with an unknown input leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality. The summary by CVE is:

Microsoft Exchange Server 2010 Service Pack 3 Update Rollup 20, Microsoft Exchange Server 2013 Cumulative Update 18, Microsoft Exchange Server 2013 Cumulative Update 19, Microsoft Exchange Server 2013 Service Pack 1, Microsoft Exchange Server 2016 Cumulative Update 7, and Microsoft Exchange Server 2016 Cumulative Update 8 allow an information disclosure vulnerability due to how URL redirects are handled, aka "Microsoft Exchange Information Disclosure Vulnerability". This CVE is unique from CVE-2018-0941.

The bug was discovered 03/13/2018. The weakness was shared 03/13/2018 as confirmed security update guide (Website). It is possible to read the advisory at portal.msrc.microsoft.com. This vulnerability is uniquely identified as CVE-2018-0924 since 12/01/2017. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1592 according to MITRE ATT&CK. The advisory points out:

An information disclosure vulnerability exists in the way that Microsoft Exchange Server handles URL redirects. If an impacted user is using Microsoft Exchange Outlook Web Access (OWA) Light, the vulnerability could allow an attacker to discover sensitive information that should otherwise not be disclosed, such as the URL of the user's OWA service.

The vulnerability scanner Nessus provides a plugin with the ID 108294 (Security Updates for Exchange (March 2018)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows : Microsoft Bulletins and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 53011 (Microsoft Windows Exchange Server Update For March 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 Tenable (108294) and SecurityFocus (BID 103320†). The entries VDB-114570 and VDB-114571 are related to this item. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.3

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
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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Nessus ID: 108294
Nessus Name: Security Updates for Exchange (March 2018)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Timelineinfo

12/01/2017 🔍
03/13/2018 +102 days 🔍
03/13/2018 +0 days 🔍
03/13/2018 +0 days 🔍
03/13/2018 +0 days 🔍
03/13/2018 +0 days 🔍
03/14/2018 +1 days 🔍
03/15/2018 +1 days 🔍
02/05/2021 +1058 days 🔍

Sourcesinfo

Vendor: microsoft.com

Advisory: portal.msrc.microsoft.com
Researcher: Richard Shupak
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-0924 (🔍)
GCVE (CVE): GCVE-0-2018-0924
GCVE (VulDB): GCVE-100-114579

OVAL: 🔍

SecurityFocus: 103320 - Microsoft Exchange Server CVE-2018-0924 Information Disclosure Vulnerability
SecurityTracker: 1040521

See also: 🔍

Entryinfo

Created: 03/15/2018 07:41
Updated: 02/05/2021 09:11
Changes: 03/15/2018 07:41 (74), 01/13/2020 15:56 (4), 02/05/2021 09:08 (2), 02/05/2021 09:11 (1)
Complete: 🔍
Cache ID: 216::103

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