CVE-2023-41763 is a vulnerability in Microsoft Skype For Business Server
Published on October 10, 2023

Skype for Business Elevation of Privilege Vulnerability

Vendor Advisory Vendor Advisory NVD

Known Exploited Vulnerability

This Microsoft Skype for Business Privilege Escalation Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. Microsoft Skype for Business contains an unspecified vulnerability that allows for privilege escalation.

The following remediation steps are recommended / required by October 31, 2023: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Vulnerability Analysis

What is a SSRF Vulnerability?

The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. By providing URLs to unexpected hosts or ports, attackers can make it appear that the server is sending the request, possibly bypassing access controls such as firewalls that prevent the attackers from accessing the URLs directly. The server can be used as a proxy to conduct port scanning of hosts in internal networks, use other URLs such as that can access documents on the system (using file://), or use other protocols such as gopher:// or tftp://, which may provide greater control over the contents of requests.

CVE-2023-41763 has been classified to as a SSRF vulnerability or weakness.

Products Associated with CVE-2023-41763

You can be notified by stack.watch whenever vulnerabilities like CVE-2023-41763 are published in these products:

Microsoft Skype For Business Server

What versions of Skype For Business Server are vulnerable to CVE-2023-41763?