LDAP access signing is not required.

From Windows Server 2008 R2 Domain Controller Security Technical Implementation Guide

Part of LDAP Signing Requirements (DC Only)

Associated with IA controls: ECSC-1

SV-36295r1_rule LDAP access signing is not required.

Vulnerability discussion

Unsigned network traffic is susceptible to man . in . the . middle attacks where an intruder captures packets between the server and the client and modifies them before forwarding them to the client. In the case of an LDAP server, this means that an attacker could cause a client to make decisions based on false records from the LDAP directory. You can lower the risk of an attacker pulling this off in a corporate network by implementing strong physical security measures to protect the network infrastructure. Furthermore, implementing Internet Protocol security (IPSec) authentication header mode (AH), which performs mutual authentication and packet integrity for Internet Protocol (IP) traffic, can make all types of man . in . the . middle attacks extremely difficult.

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Configure Domain Controller to require LDAP access signing.

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