CVE-2017-11786: microsoft corporation skype for business Authentication Bypass by Capture-replay

Vulnerability summary

CVE-2017-11786 is a high (CVSS 9.3) Authentication Bypass by Capture-replay vulnerability in microsoft corporation skype for business. EPSS estimates a 9.39% chance of exploitation in the next 30 days, higher than 95.3% of scored vulnerabilities.

Timeline

1. 13-10-2017
   PublishedVulnerability first disclosed.
2. 16-09-2024
   Last modifiedVulnerability information updated.

Description

Skype for Business in Microsoft Lync 2013 SP1 and Skype for Business 2016 allows an attacker to steal an authentication hash that can be reused elsewhere, due to how Skype for Business handles authentication requests, aka "Skype for Business Elevation of Privilege Vulnerability."

• CWE-294Authentication Bypass by Capture-replayA capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes).