NTLM Relay Attack | Breaking Cybersecurity News | The Hacker News

Microsoft on Friday shared guidance to help customers discover indicators of compromise (IoCs) associated with a recently patched Outlook vulnerability. Tracked as CVE-2023-23397 (CVSS score: 9.8), the  critical flaw  relates to a case of privilege escalation that could be exploited to steal NT LAN Manager (NTLM) hashes and stage a  relay attack  without requiring any user interaction. "External attackers could send specially crafted emails that will cause a connection from the victim to an untrusted location of attackers' control," the company  noted  in an advisory released this month. "This will leak the  Net-NTLMv2 hash  of the victim to the untrusted network which an attacker can then relay to another service and authenticate as the victim." The vulnerability was resolved by Microsoft as part of its  Patch Tuesday updates  for March 2023, but not before Russia-based threat actors weaponized the flaw in attacks targeting government, transportation, en

A new kind of Windows NTLM relay attack dubbed  DFSCoerce  has been uncovered that leverages the Distributed File System (DFS): Namespace Management Protocol (MS-DFSNM) to seize control of a domain. "Spooler service disabled, RPC filters installed to prevent PetitPotam and File Server VSS Agent Service not installed but you still want to relay [Domain Controller authentication] to [Active Directory Certificate Services]? Don't worry MS-DFSNM have (sic) your back," security researcher Filip Dragovic  said  in a tweet. MS-DFSNM  provides a remote procedure call (RPC) interface for administering distributed file system configurations. The NTLM (NT Lan Manager) relay attack is a well-known method that exploits the challenge-response mechanism. It allows malicious parties to sit between clients and servers and intercept and relay validated authentication requests in order to gain unauthorized access to network resources, effectively gaining an initial foothold in Active D

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Microsoft on Tuesday rolled out fixes for as many as  74 security vulnerabilities , including one for a zero-day bug that's being actively exploited in the wild. Of the 74 issues, seven are rated Critical, 66 are rated Important, and one is rated low in severity. Two of the flaws are listed as publicly known at the time of release. These encompass 24 remote code execution (RCE), 21 elevation of privilege, 17 information disclosure, and six denial-of-service vulnerabilities, among others. The updates are in addition to  36 flaws  patched in the Chromium-based Microsoft Edge browser on April 28, 2022. Chief among the resolved bugs is  CVE-2022-26925  (CVSS score: 8.1), a spoofing vulnerability affecting the Windows Local Security Authority ( LSA ), which Microsoft describes as a "protected subsystem that authenticates and logs users onto the local system." "An unauthenticated attacker could call a method on the LSARPC interface and coerce the domain controller to

A newly uncovered security flaw in the Windows operating system can be exploited to coerce remote Windows servers, including Domain Controllers, to authenticate with a malicious destination, thereby allowing an adversary to stage an  NTLM relay attack  and completely take over a Windows domain. The issue, dubbed " PetitPotam ," was discovered by security researcher Gilles Lionel, who shared technical details and proof-of-concept (PoC) code last week, noting that the flaw works by forcing "Windows hosts to authenticate to other machines via MS-EFSRPC EfsRpcOpenFileRaw function." MS-EFSRPC  is Microsoft's Encrypting File System Remote Protocol that's used to perform "maintenance and management operations on encrypted data that is stored remotely and accessed over a network." Specifically, the attack enables a domain controller to authenticate against a remote NTLM under a bad actor's control using the MS-EFSRPC interface and share its authen