Critical FortiOS Buffer Overflow Lets Attackers Run Arbitrary Code

Fortinet has disclosed a serious heap-based buffer overflow vulnerability affecting the cw_stad daemon in multiple versions of FortiOS, potentially allowing authenticated attackers to execute arbitrary code on affected systems.

The vulnerability, classified as CWE-122, poses significant security risks for organizations using specific FortiOS versions and hardware models configured as wireless clients.

Vulnerability Details and Attack Vector

According to the report, the heap-based buffer overflow vulnerability resides within the cw_stad daemon, a critical component of FortiOS responsible for wireless station management.

This security flaw enables authenticated attackers to exploit the system through specifically crafted requests that trigger buffer overflow conditions in the heap memory space.

Buffer overflow attacks occur when a program writes more data to a buffer than it can hold, potentially overwriting adjacent memory locations.

In this case, the heap-based nature of the vulnerability makes it particularly dangerous, as successful exploitation could lead to arbitrary code execution or command injection capabilities.

The CWE-122 classification indicates this is a heap-based buffer overflow, which differs from stack-based overflows in that it affects dynamically allocated memory rather than the call stack.

Affected Systems and Version Matrix

The vulnerability impacts multiple FortiOS version branches with varying degrees of exposure.

FortiOS 7.6 users running versions 7.6.0 through 7.6.1 face immediate risk and should upgrade to version 7.6.3 or above.

Similarly, FortiOS 7.4 installations spanning versions 7.4.0 through 7.4.7 require immediate patching to version 7.4.8 or higher.

The FortiOS 7.2 branch shows vulnerability in versions 7.2.4 through 7.2.11, with remediation available through an upgrade to version 7.2.12 or above.

Notably, FortiOS 7.0 and 6.4 branches remain unaffected by this particular vulnerability.

Specific hardware models face additional risk when configured as wireless clients, including the FWF_80F_2R_3G4G_DSL, FWF_80F_2R, FWF_81F_2R_3G4G_DSL, FWF_81F_2R_3G4G_POE, FWF_81F_2R, FWF_81F_2R_POE, FWF_90G_2R, and FWF_91G_2R models.

Mitigation Strategy and Upgrade Path

Organizations must prioritize immediate patching through Fortinet’s recommended upgrade procedures.

The company provides a comprehensive upgrade tool at https://docs.fortinet.com/upgrade-tool to assist administrators in determining optimal upgrade paths for their specific deployments.

The authenticated attacker requirement suggests that while the vulnerability is serious, it requires existing system access to exploit.

However, this should not diminish the urgency of patching, as authenticated access can often be obtained through other attack vectors or insider threats.

System administrators should implement defense-in-depth strategies, including network segmentation, access control enforcement, and continuous monitoring while preparing for the upgrade process.

The vulnerability’s impact on wireless client configurations demands particular attention to wireless security posture during the transition period.

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