Used for backward compatibility, this older hashing method has several inherit flaws, making it trivial for attackers to crack LM Hashes within minutes. These algorithms generate what’s known as an “LM Hash” or an “NT Hash”.Įnabled by default in Windows NT, 2000, XP, and Server 2003, the LM Hash has become synonymous with bad hashing practices over the years. Microsoft Windows supports two primary algorithms for locally authenticating users. In this two part series I will discuss how the LANMAN challenge/response and NTLMv1 protocols operate, how malicious users can take advantage of their shortcomings, and best practice recommendations for securely deploying these protocols. As with most things Microsoft-related, ubiquity often equates to exploitability. Whilst newer, more secure protocols (such as NTLMv2) are ready to take their place, LANMAN challenge/response and NTLMv1 are still widely deployed today for reasons of interoperability. Two such protocols widely in use today are the LANMAN challenge/response and NTLMv1 protocols. The Microsoft Windows platform uses a myriad of protocols to authenticate users across a network.
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