Rule Document 1:66480

Rule Category

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

Alert Message

SERVER-WEBAPP Microsoft Exchange DLP policy template code execution attempt

Rule Explanation

This rule looks for specially formatted SOAP request which exploit a vulnerability in Microsoft Exchange that could allow an attacker to execute arbitrary code with SYSTEM level privileges.

What To Look For

This rule alerts when Snort detects a command execution exploit targeting Microsoft Exchange

Known Usage

Attacks/Scans seen in the wild

False Positives

No known false positives

Contributors

Cisco Talos Intelligence Group

Rule Groups

Rule Categories::Server::Web Applications

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-2021-26412

Additional Links

portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26412

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-2021-26412

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