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Advisories

FlexHEX 2.71 Local Buffer Overflow via SEH Unicode

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severity
high
date
Affecting

  • FlexHEX <= 2.71

CWE
  • CWE-434 Unrestricted Upload of File with Dangerous Type
CVSS
8.6
CVSS V4 Vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Credit
Chris Au
Description
FlexHEX 2.71 contains a local buffer overflow vulnerability in the Stream Name field that allows local attackers to execute arbitrary code by triggering a structured exception handler (SEH) overflow. Attackers can craft a malicious text file with carefully aligned shellcode and SEH chain pointers, paste the contents into the Stream Name dialog, and execute arbitrary commands like calc.exe when the exception handler is triggered.

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