critical
9.3
CWE
119
Advisory Published
Advisory Published

FG-IR-23-328: Out-of-bounds Write in captive portal

First published: Tue Mar 12 2024(Updated: )

An out-of-bounds write vulnerability [CWE-787] and a Stack-based Buffer Overflow [CWE-121] in FortiOS & FortiProxy captive portal may allow an inside attacker who has access to captive portal to execute arbitrary code or commands via specially crafted HTTP requests. Workaround: Set a non form-based authentication scheme: config authentication schemeedit schemeset method methodnextend Where <method> can be any of those : ntlm NTLM authentication.basic Basic HTTP authentication.digest Digest HTTP authentication.negotiate Negotiate authentication.fsso Fortinet Single Sign-On (FSSO) authentication.rsso RADIUS Single Sign-On (RSSO) authentication.ssh-publickey Public key based SSH authentication.cert Client certificate authentication.saml SAML authentication None of the enabled authentication schemes should be form-based. Please note that only devices with captive portal enabled are affected.

Affected SoftwareAffected VersionHow to fix
Fortinet FortiOS IPS Engine
Fortinet FortiProxy
Fortinet FortiOS IPS Engine>=7.4.0<=7.4.1
Fortinet FortiOS IPS Engine>=7.2.0<=7.2.5
Fortinet FortiOS IPS Engine>=7.0.0<=7.0.12
Fortinet FortiOS IPS Engine>=6.4.0<=6.4.14
Fortinet FortiOS IPS Engine>=6.2.0<=6.2.15
Fortinet FortiProxy=.
Fortinet FortiProxy>=7.2.0<=7.2.6
Fortinet FortiProxy>=7.0.0<=7.0.12
Fortinet FortiProxy>=2.0.0<=2.0.13
Fortinet FortiSASE=3

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Reference Links

Frequently Asked Questions

  • What is the severity of FG-IR-23-328?

    FG-IR-23-328 has been classified as a critical vulnerability due to the potential for arbitrary code execution.

  • How do I fix FG-IR-23-328?

    To fix FG-IR-23-328, update FortiOS or FortiProxy to the latest versions as specified in the advisory.

  • Who is affected by FG-IR-23-328?

    FortiOS and FortiProxy users with versions vulnerable to FG-IR-23-328 are at risk.

  • What are the implications of FG-IR-23-328 if exploited?

    If exploited, FG-IR-23-328 could allow an attacker to execute arbitrary commands on the affected devices.

  • Is there a workaround for FG-IR-23-328?

    Currently, there is no specific workaround mentioned for FG-IR-23-328; updating to a patched version is advised.

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