CVE-2019-5186

Severity Score

7.0

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

An exploitable stack buffer overflow vulnerability vulnerability exists in the iocheckd service "I/O-Check" functionality of WAGO PFC 200. An attacker can send a specially crafted packet to trigger the parsing of this cache file.At 0x1eb9c the extracted interface element name from the xml file is used as an argument to /etc/config-tools/config_interfaces interface=<contents of interface element> using sprintf(). The destination buffer sp+0x40 is overflowed with the call to sprintf() for any interface values that are greater than 512-len("/etc/config-tools/config_interfaces interface=") in length. Later, at 0x1ea08 strcpy() is used to copy the contents of the stack buffer that was overflowed sp+0x40 into sp+0x440. The buffer sp+0x440 is immediately adjacent to sp+0x40 on the stack. Therefore, there is no NULL termination on the buffer sp+0x40 since it overflowed into sp+0x440. The strcpy() will result in invalid memory access. An interface value of length 0x3c4 will cause the service to crash.

Se presenta una vulnerabilidad de desbordamiento de búfer de la pila explotable en la funcionalidad "I/O-Check" del servicio iocheckd de WAGO PFC 200. Un atacante puede enviar un paquete especialmente diseñado para activar el análisis de este archivo caché. En 0x1eb9c, el nombre del elemento de interfaz extraído del archivo xml es usado como argumento para /etc/config-tools/config_interfaces interface=(contents of interface element) usando la función sprintf(). El búfer de destino sp+0x40 es desbordado con la llamada a la función sprintf() para cualquier valor de la interfaz que sea mayor de 512-len("/etc/config-tools/config_interfaces interface=") en longitud. Más tarde, en 0x1ea08 la función strcpy() es usada para copiar el contenido del búfer de la pila que se desbordó sp+0x40 en sp+0x440. El búfer sp+0x440 está inmediatamente adyacente a sp+0x40 sobre la pila. Por lo tanto, no presenta terminación NULL en el búfer sp+0x40 ya que se desbordó en sp+0x440. La función strcpy() resultará en un acceso no válido a la memoria. Un valor de longitud 0x3c4 de la interfaz causará que el servicio se bloquee.

*Credits: N/A

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2019-01-04 CVE Reserved
2020-03-23 CVE Published
2023-07-27 EPSS Updated
2024-08-04 CVE Updated
2024-08-04 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-787: Out-of-bounds Write

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC
https://talosintelligence.com/vulnerability_reports/TALOS-2019-0966	2024-08-04

URL	Date	SRC

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Wago Search vendor "Wago"	Pfc200 Firmware Search vendor "Wago" for product "Pfc200 Firmware"	03.02.02\(14\) Search vendor "Wago" for product "Pfc200 Firmware" and version "03.02.02\(14\)"	-	Affected	in	Wago Search vendor "Wago"	Pfc200 Search vendor "Wago" for product "Pfc200"	-	-	Safe