// For flags

CVE-2021-38408

Advantech WebAccess BwFLApp Stack-based Buffer Overflow Remote Code Execution Vulnerability

Severity Score

9.8
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

A stack-based buffer overflow vulnerability in Advantech WebAccess Versions 9.02 and prior caused by a lack of proper validation of the length of user-supplied data may allow remote code execution.

Una vulnerabilidad de desbordamiento de búfer en la región stack de la memoria en Advantech WebAccess versiones 9.02 y anteriores, causada por una falta de comprobación apropiada de la longitud de los datos suministrados por el usuario puede permitir una ejecución de código remota

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Advantech WebAccess. Authentication is not required to exploit this vulnerability.
The specific flaw exists within the handling of IOCTL 0x2711, which can be used to invoke BwFLApp.exe. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of Administrator.

*Credits: Natnael Samson (@NattiSamson)
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2021-08-10 CVE Reserved
  • 2021-09-03 CVE Published
  • 2024-08-04 CVE Updated
  • 2024-08-15 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-121: Stack-based Buffer Overflow
CAPEC
References (1)
URL Date SRC
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
Advantech
Search vendor "Advantech"
Webaccess
Search vendor "Advantech" for product "Webaccess"
<= 9.02
Search vendor "Advantech" for product "Webaccess" and version " <= 9.02"
-
Affected