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Advisories

OPNsense core before 26.7.8 Lockout IP Planting via WebGUI Login Username

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Severity
medium
Date
Affecting

  • core >= 0, < 26.7.8

CWE
  • CWE-117 Improper Output Neutralization for Logs
CVSS
6.9
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Credit
Abraxas Labs, Ad Schellevis
Description
OPNsense core before 26.7.8 contains a log injection vulnerability that allows unauthenticated attackers to plant victim IP addresses in the lockout_handler by submitting crafted WebGUI login usernames. Attackers can submit usernames like 'Invalid user <victim-ip>' repeatedly to add the victim to the sshlockout table, blocking SSH and WebGUI access and killing its pf states.

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