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Advisories

OPNsense 26.1.6 through 26.7.7 Captive Portal Session Takeover via Forged ARP

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Severity
medium
Date
Affecting

  • core >= 26.1.6, <= 26.7.7

CWE
  • CWE-290 Authentication Bypass by Spoofing
CVSS
5.3
CVSS V4 Vector
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Credit
lujiefsi, Abraxas Labs
Description
OPNsense core 26.1.6 through 26.7.7 contains an authentication bypass vulnerability in the captive portal roaming feature that lets unauthenticated attackers hijack authorized client sessions by spoofing unauthenticated MAC-to-IP observations. Attackers on the same Layer-2 segment can send forged gratuitous ARP replies binding their IP to a victim's MAC, gaining portal access with traffic attributed to the victim.

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