Microsoft Exchange Server 2016 CU12/2016 CU13/2019 CU1/2019 CU2 Outlook Web App input validation

Summaryinfo

A vulnerability has been found in Microsoft Exchange Server 2016 CU12/2016 CU13/2019 CU1/2019 CU2 and classified as problematic. Affected is an unknown function of the component Outlook Web App. This manipulation causes input validation. This vulnerability appears as CVE-2019-1266. The attack may be initiated remotely. There is no available exploit. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability was found in Microsoft Exchange Server 2016 CU12/2016 CU13/2019 CU1/2019 CU2 (Groupware Software). It has been declared as problematic. Affected by this vulnerability is an unknown part of the component Outlook Web App. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect confidentiality. The summary by CVE is:

A spoofing vulnerability exists in Microsoft Exchange Server when Outlook Web App (OWA) fails to properly handle web requests, aka 'Microsoft Exchange Spoofing Vulnerability'.

The weakness was presented 09/10/2019 as confirmed security update guide (Website). The advisory is shared at portal.msrc.microsoft.com. The public release was coordinated in cooperation with Microsoft. This vulnerability is known as CVE-2019-1266 since 11/26/2018. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/20/2020). The advisory points out:

A spoofing vulnerability exists in Microsoft Exchange Server when Outlook Web App (OWA) fails to properly handle web requests. An attacker who successfully exploited the vulnerability could perform script or content injection attacks, and attempt to trick the user into disclosing sensitive information. An attacker could also redirect the user to a malicious website that could spoof content or the vulnerability could be used as a pivot to chain an attack with other vulnerabilities in web services.

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

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Groupware Software

Vendor

• Microsoft

Name

• Exchange Server

Version

• 2016 CU12
• 2016 CU13
• 2019 CU1
• 2019 CU2

License

• commercial

Website

• Vendor: https://www.microsoft.com/

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