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The Hacker News - Cybersecurity News and Analysis: NTLM Relay Attack

Microsoft Releases Fix for New Zero-Day with May 2022 Patch Tuesday Updates

Microsoft Releases Fix for New Zero-Day with May 2022 Patch Tuesday Updates

May 10, 2022Ravie Lakshmanan
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
New PetitPotam NTLM Relay Attack Lets Hackers Take Over Windows Domains

New PetitPotam NTLM Relay Attack Lets Hackers Take Over Windows Domains

July 26, 2021Ravie Lakshmanan
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
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