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The Hacker News - Cybersecurity News and Analysis: Domain Controller

Active Directory Bugs Could Let hackers Take Over Windows Domain Controllers

Active Directory Bugs Could Let hackers Take Over Windows Domain Controllers

December 21, 2021Ravie Lakshmanan
Microsoft is urging customers to patch two security vulnerabilities in Active Directory domain controllers that it  addressed in November  following the availability of a proof-of-concept (PoC) tool on December 12. The two vulnerabilities — tracked as  CVE-2021-42278  and  CVE-2021-42287  — have a severity rating of 7.5 out of a maximum of 10 and concern a privilege escalation flaw affecting the Active Directory Domain Services (AD DS) component. Credited with discovering and reporting both the bugs is Andrew Bartlett of Catalyst IT. Active Directory is a  directory service  that runs on Microsoft Windows Server and is used for identity and access management. Although the tech giant marked the shortcomings as " exploitation Less Likely " in its assessment, the public disclosure of the PoC has prompted renewed calls for applying the fixes to mitigate any potential exploitation by threat actors. While CVE-2021-42278 enables an attacker to tamper with the SAM-Account-Name
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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