News & Insights

A new one-off Special Report covering efforts to identify additional vulnerable and compromised Microsoft Exchange servers and associated common web shell that are configured to use DNS based virtual hosting, rather than direct IPv4 /0 scanning for default web sites, containing data for the period 2021-03-16 to 2021-03-22.

Can you help Shadowserver sign up more countries/networks in Africa and the Info-Pacific to receive our free daily network reports and help secure the Internet? We are running a UK FCDO funded surge in Feb/March 2021, aimed at increasing outreach and expanding our honeypot sensor network in those regions. We are seeking introductions, contacts and hosting so please get in touch if you can help us achieve these goals.

Another internet wide scan based one-off Special Report identifying 59218 potentially vulnerable Microsoft Exchange Servers on 2021-03-14 courtesy of Kryptoslogic, with a comparison of the degree of overlap in coverage between this data set and our previous one-off Special Report that was just released. If your mail servers appear in either report - please patch immediately.

Another one-off Special Report identifying 73608 potentially vulnerable Microsoft Exchange Servers during the period 2021-03-13 and 2021-03-14, which corresponds to 63115 unique IP addresses in 211 countries. These exposed systems remain at very high risk and need patching immediately.

Another one off Shadowserver Special Report, this time in partnership with Kryptoslogic, provides critical information about compromised Microsoft Exchange Servers with exposed public web shells that were likely exploited using CVE-2021-26855, CVE-2021-26857, CVE-2021-26858 and CVE-2021-27065. Please remediate and patch/rebuild urgently!

Shadowserver one-off Special Reports are for reporting security events outside our usual 24-hour reporting window. Our second Special Report covers identification Microsoft Exchange Servers potentially vulnerable to CVE-2021-26855, CVE-2021-26857, CVE-2021-26858 and CVE-2021-27065 by scanning with DIVD after patches were released.

Announcing new Shadowserver one-off Special Reports, for reporting security events outside our usual 24-hour reporting window. First Special Report covers victims of alleged HAFNIUM exploitation of Microsoft Exchange Server via CVE-2021-26855, CVE-2021-26857, CVE-2021-26858 and CVE-2021-27065 between 2021-02-26 and 2021-03-03, but not subsequent mass exploitation after the patches were released.

We have started daily IPv4 /0 scanning for exposed MS-RDPEUDP instances on port 3389/UDP. Aside from the usual risks associated with exposing RDP services to the Internet, this UDP extension of the popular RDP services has been found to be susceptible to amplification DDoS abuse with an amplification factor of over 84. Over 12 000 instances of MS-RDPEUDP have been found to be accessible on the IPv4 Internet.

We have recently enabled a new IPv4 Internet-wide scan and report for accessible Radmin services on port 4899/TCP. Radmin is a remote access software product commonly in use today. Our daily scans uncover around 50,000 accessible Radmin services on port 4899/TCP. While Radmin is in general considered a secure mechanism for remote access, care should be taken as with all similar types of services to ensure no misconfiguration has taken place.

We have enabled a new scan for exposed CoAP (Constrained Application Protocol) devices on port 5683/UDP. The scan has uncovered around 460 000 exposed CoAP services that can be potentially abused for CoAP amplification DDoS attacks. These services may also leak information or expose other vulnerabilities. This is the third IoT scan implemented as part of the EU CEF VARIoT project.