Kerberos | Breaking Cybersecurity News | The Hacker News

A privilege escalation flaw has been demonstrated in Windows Server 2025 that makes it possible for attackers to compromise any user in Active Directory (AD). "The attack exploits the delegated Managed Service Account (dMSA) feature that was introduced in Windows Server 2025, works with the default configuration, and is trivial to implement," Akamai security researcher Yuval Gordon said in a report shared with The Hacker News. "This issue likely affects most organizations that rely on AD. In 91% of the environments we examined, we found users outside the domain admins group that had the required permissions to perform this attack." What makes the attack pathway notable is that it leverages a new feature called Delegated Managed Service Accounts ( dMSA ) that allows migration from an existing legacy service account. It was introduced in Windows Server 2025 as a mitigation to Kerberoasting attacks. The attack technique has been codenamed BadSuccessor by the w...

Microsoft on Wednesday outlined its plans to deprecate Visual Basic Script (VBScript) in the second half of 2024 in favor of more advanced alternatives such as JavaScript and PowerShell. "Technology has advanced over the years, giving rise to more powerful and versatile scripting languages such as JavaScript and PowerShell," Microsoft Program Manager Naveen Shankar  said . "These languages offer broader capabilities and are better suited for modern web development and automation tasks." The tech giant originally  announced  its plans to gradually sunset VBScript in October 2023. The scripting language, also called Visual Basic Scripting Edition, was first introduced by Microsoft in 1996 as a Windows system component, offering users the ability to automate tasks and develop interactive web pages using Internet Explorer and Edge (in  Internet Explorer mode ). The announced deprecation plan consists of three phases, with the first phase kicking off in the second h...

 Microsoft on Monday confirmed its plans to deprecate NT LAN Manager (NTLM) in Windows 11 in the second half of the year, as it announced a slew of new security measures to harden the widely-used desktop operating system. "Deprecating NTLM has been a huge ask from our security community as it will strengthen user authentication, and deprecation is planned in the second half of 2024," the tech giant  said . The Windows maker  originally announced  its decision to drop NTLM in favor of Kerberos for authentication in October 2023. NTLM's lack of support for cryptographic methods such as AES or SHA-256 notwithstanding, the protocol has also been rendered susceptible to relay attacks, a technique that has been widely exploited by the Russia-linked  APT28 actor  via zero-day flaws in Microsoft Outlook. Other changes coming to Windows 11 include enabling  Local Security Authority (LSA) protection  by default for new consumer devices and the use of v...

Cybersecurity researchers have discovered a case of "forced authentication" that could be exploited to leak a Windows user's NT LAN Manager (NTLM) tokens by tricking a victim into opening a specially crafted Microsoft Access file. The attack takes advantage of a legitimate feature in the database management system solution that allows users to  link to external data sources , such as a remote SQL Server table. "This feature can be abused by attackers to automatically leak the Windows user's NTLM tokens to any attacker-controlled server, via any TCP port, such as port 80," Check Point security researcher Haifei Li  said . "The attack can be launched as long as the victim opens an .accdb or .mdb file. In fact, any more-common Office file type (such as a .rtf ) can work as well." NTLM, an authentication protocol introduced by Microsoft in 1993, is a challenge-response protocol that's used to authenticate users during sign-in. Over the years, ...

Microsoft has revised the severity of a security vulnerability it originally  patched in September 2022 , upgrading it to "Critical" after it emerged that it could be exploited to achieve remote code execution. Tracked as  CVE-2022-37958  (CVSS score: 8.1), the flaw was previously described as an  information disclosure vulnerability  in SPNEGO Extended Negotiation ( NEGOEX ) Security Mechanism. SPNEGO, short for Simple and Protected GSSAPI Negotiation Mechanism (SPNEGO), is a scheme that allows a client and remote server to arrive at a consensus on the choice of the protocol to be used (e.g., Kerberos or NTLM) for authentication. But a  further analysis  of the flaw by IBM Security X-Force researcher Valentina Palmiotti found that it could allow remote execution of arbitrary code, prompting Microsoft to reclassify its severity. "This vulnerability is a pre-authentication remote code execution vulnerability impacting a wide range of protocols," I...

Microsoft's Active Directory is  said to be used by 95%  of Fortune 500. As a result, it is a prime target for attackers as they look to gain access to credentials in the organization, as compromised credentials provide one of the easiest ways for hackers to access your data. A key authentication technology that underpins Microsoft Active Directory is Kerberos. Unfortunately, hackers use many different attacks against Active Directory's implementation of the Kerberos authentication protocol. One of those is AS-REP Roasting. So what is AS-REP Roasting, and how can businesses protect themselves? What is Active Directory Kerberos? Kerberos was originally developed by the Massachusetts Institute of Technology (MIT) and centered around using tickets to establish trust. Microsoft's implementation of Kerberos found in Active Directory is based on Kerberos Network Authentication Service (V5) as defined in  RFC 4120 . However, Microsoft has added to and enhanced Kerberos with ...

Cybersecurity researchers on Wednesday disclosed a new bypass vulnerability (CVE-2021-23008) in the Kerberos Key Distribution Center (KDC) security feature impacting F5 Big-IP application delivery services. "The KDC Spoofing vulnerability allows an attacker to bypass the Kerberos authentication to Big-IP Access Policy Manager (APM), bypass security policies and gain unfettered access to sensitive workloads," Silverfort researchers Yaron Kassner and Rotem Zach said in a report. "In some cases this can be used to bypass authentication to the Big-IP admin console as well." Coinciding with the public disclosure, F5 Networks has released patches to address the weakness (CVE-2021-23008, CVSS score 8.1), with fixes introduced in BIG-IP APM versions 12.1.6, 13.1.4, 14.1.4, and 15.1.3. A similar patch for version 16.x is expected at a future date. "We recommend customers running 16.x check the security advisory to assess their exposure and get details on mitigati...