A zero-day vulnerability is always a serious matter and usually a good-enough reason for companies to quickly address it with a patch. A Microsoft … U.S. Department of Homeland Security issues an Emergency Directive in response to Microsoft Exchange ... [+] Server attacks. The attacks start by exploiting CVE-2021-26855, a server-side request forgery vulnerability, or by abusing stolen passwords. IP addresses blocked as Classification: Attackers, IP addresses blocked as Security Category: Command and Control Threat Types: Dropper. HAFNIUM, a nation-state group sponsored by China, has been discovered making limited, targeted, zero-day exploits to on-premises Microsoft Exchange Servers (not Exchange Online). Try Cisco Secure Endpoint for free here. Microsoft released patches for four vulnerabilities in Exchange Server on March 2, disclosing that these vulnerabilities were being exploited by a previously unknown threat actor, referred to as HAFNIUM.. "This seems to be much a larger spread than just 'limited and targeted attacks' as Microsoft has suggested," Hammond wrote. According to Microsoft, Hafnium … Patches for an additional three vulnerabilities in the same software have also been released: CVE-2021-26412, CVE-2021-26854 and CVE-2021-27078. The U.S. Department of Homeland Security has issued an emergency directive as ongoing Microsoft Exchange attacks determined to pose "unacceptable risk" to federal agencies. According to Huntress research, of 2,000 Exchange servers checked by the firm, 400 were found to be vulnerable and another 100 potentially so. 0. This allows the threat actor to execute additional instructions on the compromised devices. Attacks exploiting these vulnerabilities are believed to date back to Jan. 6, 2021. This position is consistent and clear. The associated flaws affect Microsoft Exchange 2013, 2016, and 2019. The threat actor has been observed using leased virtual private servers within the United States and connecting to TCP port 443 (HTTPS) on the vulnerable servers to carry out the attacks. For technical details of these exploits and how to help with detection, please see HAFNIUM Targeting Exchange Servers. Contact me in confidence at davey@happygeek.com if you have a story to reveal or research to share. Microsoft has released details an an attack named HAFNIUM which is targeting unpatched, on-premise versions of Microsoft Exchange. by Joe Panettieri • Mar 7, 2021 A Microsoft Exchange Server cyberattack and email hack apparently impacted thousands of on-premises email customers, small businesses, enterprises and government organizations worldwide. Now it’s Hafnium, a Chinese group that’s been attacking a vulnerability in Microsoft Exchange Server to sneak into victims’ email inboxes and beyond. For more information, please see the Microsoft Security Response Center (MSRC) blog. New research indicates that the scope of a breach of the Microsoft Exchange Server may be far greater than originally thought. Microsoft attributes the attacks to a group they have dubbed Hafnium. HAFNIUM targeting Exchange Servers with 0-day exploits Microsoft has detected multiple 0-day exploits being used to attack on-premises versions of Microsoft Exchange Server in … The group runs its operations through leased virtual private servers in the U.S., but is based in China, Microsoft said. I report and analyse breaking cybersecurity and privacy stories, Microsoft Issues Critical Update Warning As Chinese Hackers Attack Exchange Servers, Google Chrome Update Gets Serious: Hackers Already Have Attack Code, Security Researchers Probed 90,194 Amazon Alexa Skills—The Results Were Shocking, iOS 14.5 Poised To Launch With Exciting New Privacy And Security Features, Google Says It Wants A Privacy First Web, Here’s What That Really Means, Warning: ‘Hundreds Of Thousands’ Of Microsoft Servers Hacked In Ongoing Attack, Why You Should Stop Using WhatsApp: Critical New Update Confirmed, Why You Should Stop Using Gmail On Your iPhone, access to email accounts as well the installation of additional malware, responded to questions about the HAFNIUM attack campaign. According to Microsoft, Hafnium made use of the four security vulnerabilities that were newly found to break into the Exchange email servers that run on company networks, giving these attackers the chance to steal information from the organization of victims – like address books and email accounts – and also the ability to place malware. Exchange Online is not affected. It is believed that these vulnerabilities have not yet been exploited in the wild. Microsoft says Chinese hackers from the Hafnium group waged “limited and targeted attacks,” in which its Exchange Email servers were breached to steal data using 0-day flaws. All organisations using the affected software should prevent external access to port 443 on Exchange Servers, or set up a VPN to provide external access to port 443. Microsoft released patches for four vulnerabilities in Exchange Server on March 2, disclosing that these vulnerabilities were being exploited by a previously unknown threat actor, referred to as HAFNIUM. The attacks included three steps.
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