GET EXCHANGE SERVER VERSION INSTALL
GET EXCHANGE SERVER VERSION UPDATE

Using this mitigation will only protect against the initial portion of the attack. This can be achieved by only allowing access to the system from users who have already authenticated through a VPN, or by using a firewall to limit access to specific hosts or IP ranges. You can protect against this by restricting access to the system from untrusted users. The initial attack requires the ability to make an untrusted connection to Exchange Server port 443. Cortex XDR running on your Exchange Server will detect and prevent webshell activity commonly used in these attacks. Palo Alto Networks Next-Generation Firewalls (NGFWs) updated to Threat Prevention Content Pack 8380 or later protect against these vulnerabilities if SSL decryption is enabled for inbound traffic to the Exchange Server.

GET EXCHANGE SERVER VERSION UPDATE

If you cannot update and/or patch an Exchange Server immediately, there are some mitigations and workarounds that may reduce the chances of an attacker exploiting an Exchange Server these mitigations should only be temporary until patching can be completed.

GET EXCHANGE SERVER VERSION INSTALL

Install the out-of-band security updates for your version of Exchange Server. 2) Patch and secure all Exchange Servers. Microsoft has published information about the updates for the following specific versions of Exchange Server:Д®xchange Server 2019 (update requires Cumulative Update (CU) 8 or CU 7).Д®xchange Server 2016 (update requires CU 19 or CU 18).Д®xchange Server 2013 (update requires CU 23).Д®xchange Server 2010 (update requires SP 3 or any SP 3 RU вЂ“ this is a Defense in Depth update). Even if Exchange Servers are not internet facing, the vulnerabilities can still be exploited if access to the network has been achieved through other methods. Microsoft is recommending to install updates on all Exchange Servers, prioritising those that are externally/internet facing. Microsoft has recently released additional guidance for older, unsupported versions of Exchange. While Exchange 2010 is not vulnerable to the same attack chain as Exchange 2013/2016/2019, Microsoft has released a patch for CVE-2021-26857 for this version of the software.

Vulnerable Exchange Server versions include 2013, 2016, and 2019. 1) Locate all Exchange Servers and determine whether they need to be patched. Further, based on telemetry collected from the Palo Alto Networks Expanse platform, we estimate there remain over 125,000 unpatched Exchange Servers in the world.Д«elow you will find a concise playbook that enterprises can follow to respond to this potential threat in their environments. As a result, even if you patched immediately, your Exchange Servers could still be compromised. Estimated number of potentially compromised organizations is in the tens of thousands globally вЂ“ and very importantly, these vulnerabilities were being actively exploited for at least two months before the security patches were available. While the Microsoft Threat Intelligence Center (MSTIC) attributes the initial campaign with high confidence to HAFNIUM, a group they assess to be state-sponsored and operating out of China, multiple threat intelligence teams, including MSTIC and Unit 42, are also seeing multiple threat actors now exploiting these zero-day vulnerabilities in the wild.

These vulnerabilities let adversaries access Exchange Servers and potentially gain long-term access to victimsвЂ™ environments. On March 2, the security community became aware of four critical zero-day Microsoft Exchange Server vulnerabilities ( CVE-2021-26855, CVE-2021-26857, CVE-2021-26858 and CVE-2021-27065).

Get exchange server version