Rule Document 1:55640

Rule Category

SERVER-WEBAPP -- Snort has detected traffic exploiting vulnerabilities in web based applications on servers.

Alert Message

SERVER-WEBAPP Pulse Connect Secure SSL VPN command injection attempt

Rule Explanation

This rule looks for metacharacters associated with command injection attacks in requests to the vulnerable system.

What To Look For

This rule fires upon attempts to exploit CVE-2020-8218, a command injection vulnerability in Pulse Connect Secure SSL VPNs.

Known Usage

No public information

False Positives

No known false positives

Contributors

Cisco Talos Intelligence Group

Rule Groups

MITRE::ATT&CK Framework::Enterprise::Initial Access::External Remote Services

Adversaries may leverage external-facing remote services to initially access and/or persist within a network. Remote services such as VPNs, Citrix, and other access mechanisms allow users to connect to internal enterprise network resources from external locations. There are often remote service gateways that manage connections and credential authentication for these services.

MITRE::ATT&CK Framework::Enterprise::Initial Access::Exploit Public-Facing Application

Adversaries may attempt to take advantage of a weakness in an Internet-facing computer or program using software, data, or commands in order to cause unintended or unanticipated behavior. The weakness in the system can be a bug, a glitch, or a design vulnerability. These applications are often websites, but can include databases (like SQL), standard services (like SMB or SSH), network device administration and management protocols (like SNMP and Smart Install), and any other applications with Internet accessible open sockets, such as web servers and related services.

Vulnerability::Severity::Critical

Vulnerability::Severity::High

Vulnerability::Severity::Medium

CVE

CVE-2020-8218

Additional Links

www.gosecure.net/blog/2020/08/26/forget-your-perimeter-rce-in-pulse-connect-secure/

Rule Vulnerability

Command Injection

Command Injection attacks target applications that allow unsafe user-supplied input. Attackers transmit this input via forms, cookies, HTTP headers, etc. and exploit the applications permissions to execute system commands without injecting code.

CVE Additional Information

This product uses data from the NVD API but is not endorsed or certified by the NVD.

CVE-2020-8218

Loading description

MITRE ATT&CK Framework

Tactic: Execution

Technique: Native API

For reference, see the MITRE ATT&CK vulnerability types here: https://attack.mitre.org