US Agencies and FireEye Were Hacked Using SolarWinds Software Backdoor

CVE-2019-0708 is a use-after-free (CWE-416) vulnerability in Microsoft Remote Desktop Services, formerly Terminal Services, in which an unauthenticated attacker can connect to a target system over RDP and send specially crafted requests to trigger the flaw. Because the trigger requires no authentication, the flaw is wormable: a successful exploit grants remote code execution on the target host, potentially with elevated privileges, and could allow self-propagating attacks similar to WannaCry. Organizations running the affected Microsoft Remote Desktop Services, particularly legacy Windows releases still accepting inbound RDP connections, are in scope. Exploitation is confirmed in the wild: the flaw (nicknamed BlueKeep) is listed in CISA's KEV catalog (added 2021-11-03), CISA notes known ransomware use, and EPSS assigns it a 100% probability of exploitation within 30 days.

Do: Apply Microsoft's security updates for CVE-2019-0708 per vendor instructions, prioritizing legacy or end-of-support Windows systems exposed to inbound RDP. As mitigation, restrict RDP (TCP 3389) to trusted networks or VPN access, require Network Level Authentication (NLA), and audit perimeter firewalls and public scans for open RDP listeners. The vulnerability is in the CISA KEV catalog, so patching is treated as a required action for federal and high-risk environments.

Ivanti Pulse Connect Secure, an enterprise SSL VPN appliance, contains an arbitrary file read vulnerability (CWE-22, path traversal) that requires no authentication. An unauthenticated remote attacker with network access to the appliance over HTTPS can send a specially crafted URI containing traversal sequences to read arbitrary files from the device. The attacker gains access to sensitive appliance files, potentially including configuration or credential material useful for further compromise, and CISA records known ransomware use of this flaw. Any organization running Pulse Connect Secure, especially gateways exposed to the internet for remote access, is affected. Exploitation is established: CISA added the flaw to its Known Exploited Vulnerabilities catalog on 2021-11-03 with known ransomware use, EPSS assigns a 100% probability of exploitation in the next 30 days, and no public PoC is known.

Do: Apply updates per Ivanti's instructions, the required action in the CISA KEV entry, prioritizing internet-facing Pulse Connect Secure gateways, and consult the vendor advisory for the applicable fixed release since no version range is provided here. Where patching is not immediate, restrict HTTPS access to the appliance and hunt for signs of exploitation (unexpected file reads, anomalous VPN logins or sessions, and follow-on ransomware activity), as CISA reports known ransomware use.

Zoho ManageEngine Desktop Central contains a file upload vulnerability (CWE-502, deserialization of untrusted data) that can be exploited without authentication. A remote attacker sends crafted upload requests to the affected application, which accepts and processes the uploaded content without any credentials, resulting in execution of attacker-controlled code. Successful exploitation yields remote code execution on the server hosting Desktop Central, giving the attacker a foothold on an endpoint-management system that typically has broad reach into a corporate network. Any organization running the affected Zoho ManageEngine product is exposed, and exploitability does not depend on user interaction or credentials. The flaw is listed in CISA's Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating known exploitation in the wild, and EPSS assigns a 99.9% probability of exploitation within 30 days; specific exploited versions are not stated in the available data.

Do: Apply updates per Zoho/ManageEngine vendor instructions immediately, as the CISA KEV required action specifies. Restrict internet exposure of the Desktop Central server and audit it for signs of compromise (unexpected processes, webshells, outbound connections) since unauthenticated RCE has been exploited in the wild. Check that any exposed instances are patched before treating network access as safe.

CVE-2020-1472, widely known as "Zerologon," is an elevation-of-privilege flaw in how the Netlogon secure channel is established over the Netlogon Remote Protocol (MS-NRPC) on Microsoft domain controllers. An unauthenticated attacker with network reachability to a domain controller sends specially crafted Netlogon messages to establish a vulnerable secure channel and then runs a specially crafted application on the network to obtain domain administrator access. Successful exploitation yields domain administrator privileges, effectively full compromise of the Active Directory environment, and the flaw is known to be used in ransomware operations. Any organization running affected Windows Server versions (2008 through 20H2) as domain controllers is exposed, along with environments using Netlogon implementations from Samba and distributions or products from Fedora, openSUSE, Canonical (Ubuntu), Debian, Synology, and Oracle. Exploitation is highly active: a public Zerologon PoC/exploit is available, the flaw is on CISA's Known Exploited Vulnerabilities catalog (added 2021-11-03, with known ransomware use), and EPSS estimates a 99.4% probability of exploitation within 30 days.

Do: Apply the vendor updates on all domain controllers and other affected systems immediately, following Microsoft's two-phase Netlogon secure channel guidance (the enforcement phase of the phased rollout began in Q1 2021). Audit Netlogon secure-channel connections and event logs for clients still using vulnerable connections before enabling full enforcement, and install updated packages for Samba and other Netlogon implementations from Fedora, openSUSE, Ubuntu, Debian, Synology, and Oracle. Given known ransomware use, prioritize patching any domain controller reachable from user networks, VPNs, or the internet.