Security News
More than a week after Microsoft released a one-click mitigation tool to mitigate cyberattacks targeting on-premises Exchange servers, the company disclosed that patches have been applied to 92% of all internet-facing servers affected by the ProxyLogon vulnerabilities. According to telemetry data from RiskIQ, there are roughly 29,966 instances of Microsoft Exchange servers still exposed to attacks, down from 92,072 on March 10.
The patching level for Microsoft Exchange Servers that are vulnerable to the ProxyLogon group of security bugs has reached 92 percent, according to Microsoft. Our work continues, but we are seeing strong momentum for on-premises Exchange Server updates: 92% of worldwide Exchange IPs are now patched or mitigated.
Exploit the Exchange bugs to write a booby-trapped web file called a webshell onto a vulnerable server. Although Hafnium attacks were associated with Microsoft Exchange in media coverage, the attacks these crooks were carrying out once they got in were not specific to networks using Exchange.
Derek Manky, Chief of Security Insights & Global Threat Alliances at Fortinet's FortiGuard Labs, gives insight into the surge in attacks against vulnerable Microsoft Exchange servers over the last week. Weeks after the disclosure around the ProxyLogon group of security bugs, exploitation attempts against unpatched Microsoft Exchange servers have skyrocketed.
Roughly 92% of all Internet-connected on-premises Microsoft Exchange servers affected by the ProxyLogon vulnerabilities are now patched and safe from attacks, Microsoft said on Monday. A total of 400,000 Internet-connected Exchange servers were impacted by the ProxyLogon vulnerabilities when Microsoft issued the initial security patches, on March 2, with over 100,000 of them still unpatched one week later, on March 9.
Another ransomware operation known as 'Black Kingdom' is exploiting the Microsoft Exchange Server ProxyLogon vulnerabilities to encrypt servers. Over the weekend, security researcher Marcus Hutchins, aka MalwareTechBlog, tweeted that a threat actor was compromising Microsoft Exchange servers via the ProxyLogon vulnerabilities to deploy ransomware.
Another ransomware operation known as 'Black Kingdom' is exploiting the Microsoft Exchange Server ProxyLogon vulnerabilities to encrypt servers. Over the weekend, security researcher Marcus Hutchins, aka MalwareTechBlog, tweeted that a threat actor was compromising Microsoft Exchange servers via the ProxyLogon vulnerabilities to deploy ransomware.
Ongoing Office 365-themed phishing campaign targets executives, assistants, financial departmentsA sophisticated and highly targeted Microsoft Office 365 phishing campaign is being aimed at C-suite executives, executive assistants and financial departments across numerous industries. As attacks on Exchange servers escalate, Microsoft investigates potential PoC exploit leakMicrosoft Exchange servers around the world are still getting compromised via the ProxyLogon and three other vulnerabilities patched by Microsoft in early March.
Microsoft informed customers on Thursday that Defender Antivirus and System Center Endpoint Protection now provide automatic protection against attacks exploiting the recently disclosed Exchange Server vulnerabilities. Microsoft has released patches, detailed guidance, and a one-click mitigation tool to ensure that Exchange Server users are protected against attacks.
Microsoft Defender Antivirus will now protect unpatched on-premises Exchange servers from ongoing attacks by automatically mitigating the actively exploited CVE-2021-26855 vulnerability. The Microsoft Defender automatic protection from active attacks targeting unpatched Exchange servers works by breaking the attack chain.