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CVE-2017-8563 is a Microsoft Windows elevation-of-privilege vulnerability affecting multiple supported Windows client and server versions. The issue is described as Kerberos falling back to NT LAN Manager (NTLM) authentication as the default authentication protocol, creating conditions in which LDAP authentication over SSL/TLS can be abused in relay/man-in-the-middle scenarios. Microsoft’s associated guidance ties this CVE to the introduction of Extended Protection for Authentication support and LDAP channel binding controls, including the LdapEnforceChannelBinding registry setting on AD DS and AD LDS systems. When channel binding is not enforced, an attacker positioned as a man in the middle can forward LDAP authentication requests to a domain controller or AD LDS instance. Once the CVE-2017-8563 update is installed, administrators can configure channel binding validation to detect and block forwarded authentication requests over LDAPS.
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4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Microsoft Windows elevation-of-privilege vulnerability in LDAP authentication where a man-in-the-middle can forward (relay) authentication requests to an LDAP server (e.g., AD DS/AD LDS). The fix adds Extended Protection for Authentication support, enabling LDAP channel binding protections to detect/block forwarded authentication requests when configured.
A Microsoft security update related to LDAP authentication over SSL/TLS that introduces channel binding enforcement settings to improve security for Active Directory Domain Services and Active Directory Lightweight Directory Services.
A Windows security vulnerability/update referenced as the prerequisite that added LDAP channel binding support, used to harden Active Directory domain controllers against man-in-the-middle forwarding and related authentication risks.
A Microsoft vulnerability/update referenced as a prerequisite for enabling LDAP Channel Binding and LDAP signing protections; the article emphasizes deployment requirements and compatibility implications rather than exploitation.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.