CVE-2021-26088 : Security Advisory and Response
Learn about CVE-2021-26088, an improper authentication vulnerability in Fortinet FSSO Collector 5.0.295 and below allowing unauthenticated network access. Discover impact, affected systems, and mitigation steps.
This CVE-2021-26088 is an improper authentication vulnerability in FSSO Collector version 5.0.295 and below. It could allow an unauthenticated user to bypass firewall policies and access protected networks by sending specially crafted UDP login notification packets.
Understanding CVE-2021-26088
This section will delve into the details of the CVE-2021-26088 vulnerability, its impact, technical aspects, and mitigation strategies.
What is CVE-2021-26088?
CVE-2021-26088 refers to an improper authentication vulnerability in FSSO Collector version 5.0.295 and below, impacting systems running affected Fortinet FSSO Windows DC Agent and FSSO Windows CA versions.
The Impact of CVE-2021-26088
The vulnerability poses a high base severity risk (CVSS base score 7.1) as an unauthenticated attacker could breach network security through crafted UDP packets bypassing firewall policies.
Technical Details of CVE-2021-26088
Let's explore the technical aspects of the CVE-2021-26088 vulnerability to gain insights into the affected systems, exploitation methods, and more.
Vulnerability Description
The vulnerability allows unauthenticated users to exploit FSSO Collector to breach firewall policies and gain access to the network using manipulated UDP login packets.
Affected Systems and Versions
Fortinet FSSO Windows DC Agent versions 5.0.295 and 5.0.294, along with FSSO Windows CA versions 5.0.295 and 5.0.294, are susceptible to this authentication bypass exploit.
Exploitation Mechanism
By sending specially crafted UDP login notification packets, an unauthenticated user can circumvent FSSO firewall policies, compromising network security.
Mitigation and Prevention
Understanding how to mitigate and prevent CVE-2021-26088 is crucial to safeguard systems from potential exploitation.
Immediate Steps to Take
Affected users should update Fortinet FSSO versions to patches that address the authentication vulnerability immediately.
Long-Term Security Practices
Implementing robust network security measures, regular vulnerability assessments, and security awareness training can enhance long-term security posture.
Patching and Updates
Regularly apply vendor-released security patches and updates to Fortinet FSSO Windows DC Agent and FSSO Windows CA to eliminate this vulnerability.