Microsoft Exchange Archives - Page 5 of 5

Pierluigi Paganini March 08, 2021

Microsoft updated MSERT to detect web shells used in attacks against Microsoft Exchange installs

Microsoft updated its Microsoft Safety Scanner (MSERT) tool to detect web shells employed in the recent Exchange Server attacks. Early this month, Microsoft has released emergency out-of-band security updates that address four zero-day issues (CVE-2021-26855, CVE-2021-26857, CVE-2021-26858, and CVE-2021-27065) in all supported Microsoft Exchange versions that are actively exploited in the wild. The IT giant reported that […]

Pierluigi Paganini March 07, 2021

Chinese hackers allegedly hit thousands of organizations using Microsoft Exchange

Thousands of organizations may have been victims of cyberattacks on Microsoft Exchange servers conducted by China-linked threat actors since January. At least tens of thousands of Microsoft customers may have been hacked by allegedly China-linked threat actors since January, including business and government agencies. The attacks started in January, but the attackers’ activity intensified in […]

Pierluigi Paganini March 06, 2021

Microsoft releases IOC Detection Tool for Microsoft Exchange Server flaws

After the disclosure of Microsoft Exchange zero-days, MS Exchange Server team has released a script to determine if an install is vulnerable. This week Microsoft has released emergency out-of-band security updates that address four zero-day issues (CVE-2021-26855, CVE-2021-26857, CVE-2021-26858, and CVE-2021-27065) in all supported MS Exchange versions that are actively exploited in the wild. In response to the […]

Pierluigi Paganini March 03, 2021

Four zero-days in Microsoft Exchange actively exploited in the wild

Microsoft released emergency out-of-band security updates for all supported Microsoft Exchange versions that fix four zero-day flaws. Microsoft has released emergency out-of-band security updates that address four zero-day issues (CVE-2021-26855, CVE-2021-26857, CVE-2021-26858, and CVE-2021-27065) in all supported Microsoft Exchange versions that are actively exploited in the wild. The IT giant reported that at least one […]

Pierluigi Paganini November 09, 2020

xHunt hackers hit Microsoft Exchange with two news backdoors

While investigating a cyber attack on the Microsoft Exchange server of an organization in Kuwait, experts found two new Powershell backdoors. Security experts from Palo Alto Networks have spotted two never-before-detected Powershell backdoors while investigating an attack on Microsoft Exchange servers at an organization in Kuwait. Experts attribute the attack to a known threat actor […]

Pierluigi Paganini September 30, 2020

Over 61% of Exchange servers vulnerable to CVE-2020-0688 attacks

More than 247,000 Microsoft Exchange servers are still vulnerable to attacks exploiting the CVE-2020-0688 RCE issue impacting Exchange Server. The CVE-2020-0688 vulnerability resides in the Exchange Control Panel (ECP) component, the root cause of the problem is that Exchange servers fail to properly create unique keys at install time. “Knowledge of a the validation key allows […]

Pierluigi Paganini September 15, 2020

China-linked hackers target government agencies by exploiting flaws in Citrix, Pulse, and F5 systems, and MS Exchange

CISA published an advisory on China-linked groups targeting government agencies by exploiting flaws in Microsoft Exchange, Citrix, Pulse, and F5 systems. CISA published a security advisory warning of a wave of attacks carried out by China-linked APT groups affiliated with China’s Ministry of State Security. Chinese state-sponsored hackers have probed US government networks looking for vulnerable networking […]

Pierluigi Paganini March 16, 2020

Most organizations have yet to fix CVE-2020-0688 Microsoft Exchange flaw

Organizations are delaying in patching Microsoft Exchange Server flaw (CVE-2020-0688) that Microsoft fixed with February 2020 Patch Day updates. Organizations are delaying in patching Microsoft Exchange Server flaw (CVE-2020-0688) that Microsoft fixed with February 2020 Patch Day updates. The CVE-2020-0688 flaw resides in the Exchange Control Panel (ECP) component, the root cause of the problem is that Exchange servers […]

Pierluigi Paganini February 27, 2020

Threat actors scan Internet for Vulnerable Microsoft Exchange Servers

Experts warn that hackers are actively scanning the Internet for Microsoft Exchange Servers vulnerable in the attempt to exploit the CVE-2020-0688 RCE. Hackers are actively scanning the Internet for Microsoft Exchange Servers affected by the CVE-2020-0688 remote code execution flaw. The vulnerability resides in the Exchange Control Panel (ECP) component, the root cause of the […]