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Advisories

Ettercap through 0.8.4.1 Stack Buffer Underwrite via Telnet Dissector Backspace Handling

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Severity
high
Date
Affecting

  • ettercap <= 0.8.4.1

CWE
  • CWE-124 Buffer Underwrite ('Buffer Underflow')
CVSS
8.7
CVSS V4 Vector
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Credit
Adiel Sol, Arad Inbar, Erez Cohen, Nir Somech, Ben Grinberg, Daniel Lubel, Shir Sadon (DREAM Security Research Team), Emilio Escobar
Description
Ettercap through 0.8.4.1 contains a stack buffer underwrite vulnerability in the telnet dissector in src/dissectors/ec_telnet.c that decrements the output pointer on backspace without a lower bound check. Attackers can send a telnet stream with more backspaces than preceding characters to write below the stack buffer, corrupting the stack of the Ettercap process that normally runs as root.

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