SB2018090516 - Input validation error in Fortinet, FortiOS

Description

This security bulletin contains information about 1 vulnerability.

1) Input validation error (CVE-ID: CVE-2018-9192)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote non-authenticated attacker to gain access to sensitive information.

A plaintext recovery of encrypted messages or a Man-in-the-middle (MiTM) attack on RSA PKCS #1 v1.5 encryption may be possible without knowledge of the server's private key. Fortinet FortiOS 5.4.6 to 5.4.9, 6.0.0 and 6.0.1 are vulnerable by such attack under SSL Deep Inspection feature when CPx being used.

Remediation

Install update from vendor's website.

References

• https://fortiguard.com/advisory/FG-IR-17-302
• https://robotattack.org/
• https://www.kb.cert.org/vuls/id/144389