Security News > 2020 > November > Microsoft releases patching guidance for Kerberos security bug
Microsoft has released additional details on how to fully mitigate a security feature bypass vulnerability in Kerberos KDC patched during this month's Patch Tuesday.
The remotely exploitable security bug tracked as CVE-2020-17049 exists in the way KDC decides if service tickets can be used for delegation via Kerberos Constrained Delegation.
Microsoft released security updates to address the Kerberos KDC security feature bypass earlier this month, during November 2020's Patch Tuesday.
Patching CVE-2020-17049 will cause some domain controllers to potentially encounter Kerberos authentication and Kerberos ticket renewal issues as Microsoft revealed on the Windows Health Dashboard on November 16.
The update cannot be installed via Windows Update or Microsoft Update channels because it is only available as stand-alone packages distributed through the Microsoft Update Catalog.
News URL
Related news
- 3 Actively Exploited Zero-Day Flaws Patched in Microsoft's Latest Security Update (source)
- ‘Sneaky Log’ Microsoft Spoofing Scheme Sidesteps Two-Factor Security (source)
- Microsoft: Outdated Exchange servers fail to auto-mitigate security bugs (source)
- Microsoft: January Windows security updates break audio playback (source)
- Microsoft shares workaround for Windows security update issues (source)
Related Vulnerability
| DATE | CVE | VULNERABILITY TITLE | RISK |
|---|---|---|---|
| 2020-11-11 | CVE-2020-17049 | Incorrect Authorization vulnerability in multiple products A security feature bypass vulnerability exists in the way Key Distribution Center (KDC) determines if a service ticket can be used for delegation via Kerberos Constrained Delegation (KCD). To exploit the vulnerability, a compromised service that is configured to use KCD could tamper with a service ticket that is not valid for delegation to force the KDC to accept it. The update addresses this vulnerability by changing how the KDC validates service tickets used with KCD. | 0.0 |