// For flags

CVE-2024-55629

Suricata generic detection bypass using TCP urgent support

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Attend
*SSVC
Descriptions

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Prior to 7.0.8, TCP streams with TCP urgent data (out of band data) can lead to Suricata analyzing data differently than the applications at the TCP endpoints, leading to possible evasions. Suricata 7.0.8 includes options to allow users to configure how to handle TCP urgent data. In IPS mode, you can use a rule such as drop tcp any any -> any any (sid:1; tcp.flags:U*;) to drop all the packets with urgent flag set.

Suricata es un sistema de detección de intrusiones de red, un sistema de prevención de intrusiones y un motor de monitoreo de seguridad de red. Antes de la versión 7.0.8, los flujos TCP con datos urgentes TCP (datos fuera de banda) pueden provocar que Suricata analice los datos de manera diferente a las aplicaciones en los endpoints TCP, lo que puede generar posibles evasiones. Suricata 7.0.8 incluye opciones para permitir que los usuarios configuren cómo gestionar los datos urgentes TCP. En el modo IPS, puede usar una regla como drop tcp any any -> any any (sid:1; tcp.flags:U*;) para descartar todos los paquetes con el indicador de urgencia establecido.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
Complete
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:Attend
Exploitation
None
Automatable
Yes
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2024-12-09 CVE Reserved
  • 2024-12-12 CVE Published
  • 2025-01-06 CVE Updated
  • 2025-04-01 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-437: Incomplete Model of Endpoint Features
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
OISF
Search vendor "OISF"
Suricata
Search vendor "OISF" for product "Suricata"
< 7.0.8
Search vendor "OISF" for product "Suricata" and version " < 7.0.8"
en
Affected