A out-of-bounds write vulnerability [CWE-787] in FortiOS and FortiProxy may allow a remote unauthenticated attacker to execute arbitrary code or command via specially crafted HTTP requests.

Workaround : disable SSL VPN (disable webmode is NOT a valid workaround)

Note: This is potentially being exploited in the wild.

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.

A insufficiently protected credentials in Fortinet FortiProxy 7.4.0, 7.2.0 through 7.2.6, 7.0.0 through 7.0.12, 2.0.0 through 2.0.13, 1.2.0 through 1.2.13, 1.1.0 through 1.1.6, 1.0.0 through 1.0.7, Fortinet FortiOS 7.4.0 through 7.4.1, 7.2.0 through 7.2.6, 7.0.0 through 7.0.12, 6.4.0 through 6.4.14, 6.2.0 through 6.2.15, 6.0.0 through 6.0.17 allows attacker to execute unauthorized code or commands via targeted social engineering attack

An authorization bypass through user-controlled key vulnerability [CWE-639] in FortiOS and FortiProxy SSLVPN may allow an authenticated attacker to gain access to another user’s bookmark via URL manipulation.

A stack-based buffer overflow in Fortinet FortiOS version 7.4.0 through 7.4.2, 7.2.0 through 7.2.6, 7.0.0 through 7.0.13, 6.4.0 through 6.4.14, 6.2.0 through 6.2.15, 6.0 all versions allows attacker to execute unauthorized code or commands via specially crafted commands

An insufficiently protected credentials vulnerability (CWE-522) in FortiOS and FortiProxy may allow an attacker to obtain the administrator cookie in rare and specific conditions, via tricking the administrator into visiting a malicious attacker-controlled website through the SSL-VPN.

Multiple stack-based buffer overflow vulnerabilities [CWE-121] in the command line interpreter of FortiOS may allow an authenticated attacker to execute unauthorized code or commands via specially crafted command line arguments.

An authorization bypass through user-controlled key vulnerability [CWE-639] in FortiOS and FortiProxy SSLVPN may allow an authenticated attacker to gain access to another user’s bookmark via URL manipulation.

An improper validation of integrity check value vulnerability [CWE-354] in FortiOS 7.2.0 through 7.2.3, 7.0.0 through 7.0.12, 6.4 all versions, 6.2 all versions, 6.0 all versions and VMs may allow a local attacker with admin privileges to boot a malicious image on the device and bypass the filesystem integrity check in place.

A null pointer dereference [CWE-476] in FortiOS and FortiProxy SSL VPN may allow an authenticated attacker to perform a DoS attack on the device via specifically crafted HTTP requests.

An improper access control vulnerability [CWE-284] in FortiOS and FortiProxy may allow a remote unauthenticated attacker to bypass the firewall deny geolocalisation policy via timing the bypass with a GeoIP database update.