SB2023061310 - Unauthenticated remote code execution in FortiOS and FortiProxy SSL-VPN

Description

This security bulletin contains information about 1 security vulnerability.

1) Heap-based buffer overflow (CVE-ID: CVE-2023-27997)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error within the SSL-VPN feature. A remote non-authenticated attacker can send specially crafted requests to the SSL-VPN interface, trigger a heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Note, the vulnerability is being actively exploited in the wild.

Remediation

Install update from vendor's website.

References

• https://fortiguard.fortinet.com/psirt/FG-IR-23-097
• https://www.fortinet.com/blog/psirt-blogs/analysis-of-cve-2023-27997-and-clarifications-on-volt-typhoon-campaign