SB2021060140 - Multiple vulnerabilities in Fortinet FortiWLC

Description

This security bulletin contains information about 3 secuirty vulnerabilities.

1) Stored cross-site scripting (CVE-ID: CVE-2021-26087)

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data in FortiWLC web interface. A remote non-authenticated attacker can inject and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

2) Stack-based buffer overflow (CVE-ID: CVE-2021-26094)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a boundary error in the command line interface of FortiWLC. A local user can run a specially crafted CLI command to trigger stack-based buffer overflow and execute arbitrary code on the target system with elevated privileges.

3) Access of Uninitialized Pointer (CVE-ID: CVE-2021-26093)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a boundary error in the command line interface of FortiWLC. A local user can run a specially crafted CLI command to trigger access of uninitialized pointer and execute arbitrary code on the target system with elevated privileges.

Remediation

Install update from vendor's website.

References

• https://www.fortiguard.com/psirt/FG-IR-20-137
• https://www.fortiguard.com/psirt/FG-IR-21-001
• https://www.fortiguard.com/psirt/FG-IR-21-002