CVE-2024-27568 in T300-T390
Summary
by MITRE • 03/01/2024
LBT T300-T390 v2.2.1.8 were discovered to contain a stack overflow via the apn_name_3g parameter in the setupEC20Apn function. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted POST request.
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Analysis
by VulDB Data Team • 08/28/2024
The vulnerability identified as CVE-2024-27568 affects LBT T300-T390 devices running firmware version 2.2.1.8, representing a critical stack overflow condition that fundamentally compromises system stability and availability. This flaw exists within the setupEC20Apn function where the apn_name_3g parameter is processed without adequate bounds checking, creating an exploitable condition that can be triggered through a specially crafted POST request. The vulnerability specifically targets the device's network configuration interface, where the application fails to validate input length before copying data to a fixed-size stack buffer, thereby enabling attackers to overwrite adjacent memory locations and potentially execute arbitrary code or cause system crashes.
The technical implementation of this vulnerability aligns with CWE-121 Stack-based Buffer Overflow, which occurs when a program writes data to a buffer located on the stack without proper bounds checking, allowing the overflow to overwrite adjacent stack memory including return addresses and other critical control data. The attack vector requires an unauthenticated remote attacker to send a malicious POST request containing an excessively long apn_name_3g parameter that exceeds the allocated stack buffer capacity, typically measured in bytes. This specific implementation follows ATT&CK technique T1210 Exploitation of Remote Services, where attackers leverage network-facing applications to execute malicious code or cause service disruption through buffer overflow exploitation.
The operational impact of this vulnerability extends beyond simple denial of service, as it represents a significant security risk for network infrastructure devices that rely on these embedded systems for connectivity management. When exploited, the stack overflow can cause immediate system crashes, restart loops, or potentially allow attackers to gain unauthorized access to the device's underlying operating system, particularly if the device lacks proper memory protection mechanisms such as stack canaries or address space layout randomization. The affected LBT T300-T390 devices are commonly deployed in industrial IoT environments and mobile communication networks where device availability is critical, making this vulnerability particularly dangerous as it can disrupt network connectivity for connected devices and potentially enable broader network compromise.
Mitigation strategies for CVE-2024-27568 should include immediate firmware updates from the vendor to address the buffer overflow condition through proper input validation and bounds checking mechanisms. Network administrators should implement network segmentation and access controls to limit exposure of affected devices to untrusted networks, while also monitoring for suspicious POST requests that might indicate exploitation attempts. The implementation of input validation controls including length restrictions, parameter sanitization, and proper error handling should be enforced at the application level to prevent similar vulnerabilities from occurring in future deployments. Additionally, organizations should consider deploying intrusion detection systems capable of identifying malformed POST requests targeting the specific vulnerable parameter, and establish incident response procedures to quickly address any exploitation attempts that may occur in their network environments.