SB2020093081 - Multiple vulnerabilities in FortiOS

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Heap-based buffer overflow (CVE-ID: CVE-2020-12819)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary error in the processing of Link Control Protocol messages. A remote authenticated attacker can send a specially crafted LCP packet, trigger heap-based buffer overflow and cause a denial of service condition on the target system.

2) Stack-based buffer overflow (CVE-ID: CVE-2020-12820)

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

The vulnerability exists due to a boundary error in SSL VPN daemon. A remote authenticated attacker can request a large FortiClient file name, trigger stack-based buffer overflow and execute arbitrary code on the target system.

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

Remediation

Install update from vendor's website.

References

• https://fortiguard.com/psirt/FG-IR-20-082
• https://fortiguard.com/psirt/FG-IR-20-083