Scanner found severe vulnerability

Rule ID

PH_Rule_Vuln_1

Default Status

Enabled

Description

Detects a high severity vulnerability reported by a vulnerability scanner

Severity

MITRE ATT&CK® Tactics

Impact

Impact consists of techniques that adversaries use to disrupt availability or compromise integrity by manipulating business and operational processes. Techniques used for impact can include destroying or tampering with data. In some cases, business processes can look fine, but may have been altered to benefit the adversaries’ goals. These techniques might be used by adversaries to follow through on their end goal or to provide cover for a confidentiality breach.

https://attack.mitre.org/tactics/TA0040

MITRE ATT&CK® Techniques

T1499.004

Endpoint Denial of Service: Application or System Exploitation

Adversaries may exploit software vulnerabilities that can cause an application or system to crash and deny availability to users. (Citation: Sucuri BIND9 August 2015) Some systems may automatically restart critical applications and services when crashes occur, but they can likely be re-exploited to cause a persistent DoS condition.

https://attack.mitre.org/techniques/T1499/004

Impacts

Server

Data Source

Qualys via QualysAPI, Rapid7 via NexPose API or InsightVM_API, Tenable or Nessus via NessusAPI, FortiClient via Syslog, FortiClient via FortiEMS_API, Digital Defense via FRONTLINE_API

Detection

Correlation

Remediation Guidance

No remediation guidance specified

Time Window

If the following pattern or patterns match an ingested event within the given time window in seconds, trigger an incident.

300 seconds

Trigger Conditions

If the following defined pattern/s occur within a 300 second time window.

ScannerHighSev

SubPattern Definitions

SubPattern Name: ScannerHighSev

This is the named definition of the event query, this is important if multiple subpatterns are defined to distinguish them.

SubPattern Query

This is the query logic that matches incoming events

eventType IN (Group@PH_SYS_EVENT_Vulnerability) AND reptVendor IN ("Qualys", "Nessus", "nCircle", "Rapid7", "McAfee", "Tenable","Fortinet", "Digital Defense", "FortiClient") AND eventSeverity >= 8

Group by Attributes

This defines how matching events are aggregated, only events with the same matching attribute values are grouped into one unique incident ID

hostName,vulnName

Aggregate Constraint

This is most typically a numerical constraint that defines when the rule should trigger an incident

COUNT(*) >= 1

Incident Attribute Mapping

This section defines which fields in matching raw events should be mapped to the incident attributes in the resulting incident.

The available raw event attributes to map are limited to the group by attributes and the aggregate event constraint fields for each subpattern

 hostName = ScannerHighSev.hostName,
 vulnName = ScannerHighSev.vulnName

FortiSIEM Rules