Microsoft Skype for Business Server 2019 CU2 Request input validation

Summaryinfo

A vulnerability marked as problematic has been reported in Microsoft Skype for Business Server 2019 CU2. Affected by this vulnerability is an unknown functionality. The manipulation as part of Request leads to input validation. This vulnerability is uniquely identified as CVE-2019-1490. The attack is possible to be carried out remotely. No exploit exists. It is recommended to apply a patch to fix this issue.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Microsoft Skype for Business Server 2019 CU2 (Unified Communication Software). This issue affects an unknown code. The manipulation as part of a Request leads to a input validation vulnerability. Using CWE to declare the problem leads to 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. Impacted is integrity. The summary by CVE is:

A spoofing vulnerability exists when a Skype for Business Server does not properly sanitize a specially crafted request, aka 'Skype for Business Server Spoofing Vulnerability'.

The weakness was disclosed 12/10/2019 as confirmed security update guide (Website). It is possible to read the advisory at portal.msrc.microsoft.com. The public release has been coordinated in cooperation with Microsoft. The identification of this vulnerability is CVE-2019-1490 since 11/26/2018. The attack may be initiated remotely. A simple 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 advisory points out:

A spoofing vulnerability exists when a Skype for Business Server does not properly sanitize a specially crafted request. An authenticated attacker could exploit the vulnerability by sending a specially crafted request to an affected server. The attacker who successfully exploited this vulnerability could then perform cross-site scripting attacks on affected systems and run scripts in the security context of the current user.

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

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Productinfo

Type

• Unified Communication Software

Vendor

• Microsoft

Name

• Skype for Business Server

Version

• 2019 CU2

License

• commercial

Website

• Vendor: https://www.microsoft.com/

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