Oct 2023: Skype for Business Elevation of Privilege Vulnerability: CVE-2023-41763 October 2023

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.

Weakness Type

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

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Affected Versions

Exploit Probability

EPSS

12.67%

Percentile

93.85%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.