Rule Document 1:67480

Rule Category

PROTOCOL-OTHER -- Snort alerted on traffic known to exploit vulnerabilities in protocols that do not fit into one of the other protocol rule categories.

Alert Message

PROTOCOL-OTHER FreeRDP Kerberos authInfo wrap token denial of service attempt

Rule Explanation

This rule looks for a Kerberos GSS wrap token with an unusually large extra count and a rotation count of 28, present in the "authInfo" field of the CredSSP authentication exchange. Successful exploitation can cause a denial of service on the targeted FreeRDP server.

What To Look For

This rule fires on attempts to trigger a denial of service condition in FreeRDP implementations via crafted Kerberos wrap tokens.

Known Usage

No public information

False Positives

No known false positives

Contributors

Cisco Talos Intelligence Group

Rule Groups

Rule Categories::Protocol::Other

Rule Categories::Server::Other

MITRE::ATT&CK Framework::Enterprise::Impact::Endpoint Denial of Service::Application or System Exploitation

Vulnerability::Severity::Critical

Vulnerability::Severity::High

CVE

CVE-2026-73242

Additional Links

github.com/FreeRDP/FreeRDP/security/advisories/GHSA-vv64-95pc-vj9v

Rule Vulnerability

Memory Corruption

Memory Corruption is any vulnerability that allows the modification of the content of memory locations in a way not intended by the developer. Memory corruption results are inconsistent; they could lead to fatal errors and system crashes or data leakage; some have no effect at all.

CVE Additional Information

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

CVE-2026-73242

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