Rule Document 1:56162

Rule Category

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

Alert Message

SERVER-WEBAPP Citrix ADC and Gateway information disclosure attempt

Rule Explanation

This rule detects an attempted information disclosure by an unauthenticated user in vulnerable versions of Citrix ADC and Citrix Gateway by searching for specific parameters sent in an exploit attempt.

What To Look For

This rule detects an attempted information disclosure by an unauthenticated user in vulnerable versions of Citrix ADC and Citrix Gateway.

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::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.

MITRE::ATT&CK Framework::Enterprise::Reconnaissance::Gather Victim Host Information

Adversaries may gather information about the victim's hosts that can be used during targeting. Information about hosts may include a variety of details, including administrative data (ex: name, assigned IP, functionality, etc.) as well as specifics regarding its configuration (ex: operating system, language, etc.).

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.

Vulnerability::Severity::High

Vulnerability::Severity::Critical

Vulnerability::Severity::Medium

CVE

CVE-2020-8196 CVE-2020-8195

Additional Links

support.citrix.com/article/CTX276688

Rule Vulnerability

Information Leak

Information Leakage happens when an attacker manipulates a system into revealing sensitive information, either through malformed input or by taking advantage of another feature of the system.

CVE Additional Information

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

CVE-2020-8196

Loading description

CVE-2020-8195

Loading description

MITRE ATT&CK Framework

Tactic: Initial Access

Technique: Exploit Public-Facing Application

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