CVE-2021-26105 in FortiSandbox
Summary
by MITRE • 03/24/2025
A stack-based buffer overflow vulnerability (CWE-121) in the profile parser of FortiSandbox version 3.2.2 and below, version 3.1.4 and below may allow an authenticated attacker to potentially execute unauthorized code or commands via specifically crafted HTTP requests.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 07/25/2025
The vulnerability identified as CVE-2021-26105 represents a critical stack-based buffer overflow flaw classified under CWE-121 within the profile parser component of FortiSandbox software. This vulnerability affects versions 3.2.2 and below, as well as version 3.1.4 and below, creating a significant security risk for organizations utilizing these impacted versions. The flaw resides in how the system processes profile data through HTTP requests, specifically when handling crafted input that exceeds allocated buffer boundaries. Attackers exploiting this vulnerability can potentially gain unauthorized code execution privileges, making it a severe threat to network security infrastructure.
The technical implementation of this vulnerability stems from inadequate input validation and buffer management within the profile parsing functionality. When an authenticated attacker submits specially crafted HTTP requests containing malformed profile data, the system fails to properly validate the input length against allocated stack memory buffers. This condition creates a scenario where malicious data can overwrite adjacent memory locations, potentially corrupting program execution flow and allowing for arbitrary code injection. The attack vector specifically leverages HTTP request processing, making it accessible through standard network protocols and requiring only authentication credentials to exploit the flaw effectively.
From an operational impact perspective, this vulnerability presents multiple attack surface considerations that directly threaten organizational security postures. An authenticated attacker with access to the FortiSandbox system can escalate privileges and execute arbitrary commands on the affected device, potentially leading to complete system compromise. The vulnerability's exploitation can result in unauthorized data access, system disruption, and potential lateral movement within network environments where FortiSandbox is deployed. Organizations relying on this security appliance for malware analysis and threat detection face significant risks as attackers could potentially bypass security controls or corrupt analysis results.
The security implications extend beyond immediate system compromise to encompass broader enterprise security frameworks. This vulnerability aligns with ATT&CK technique T1059.007 for command and scripting interpreter and T1068 for exploit for privilege escalation, demonstrating how the flaw can be leveraged for multi-stage attacks. Organizations should consider implementing network segmentation strategies to limit access to FortiSandbox appliances and establish robust monitoring for anomalous HTTP request patterns. The vulnerability also highlights the importance of maintaining up-to-date security patches and implementing proper access controls to minimize the attack surface. Mitigation efforts should include immediate patching of affected systems, network access controls, and enhanced logging to detect potential exploitation attempts. Security teams must also evaluate their incident response procedures to address potential compromise scenarios involving this specific vulnerability.