CVE-2023-40458 in ALEOS
Summary
by MITRE • 11/30/2023
Loop with Unreachable Exit Condition ('Infinite Loop') vulnerability in Sierra Wireless, Inc ALEOS could potentially allow a remote attacker to trigger a Denial of Service (DoS) condition for ACEManager without impairing other router functions. This condition is cleared by restarting the device.
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Analysis
by VulDB Data Team • 12/20/2023
The vulnerability identified as CVE-2023-40458 represents a critical infinite loop flaw within the Sierra Wireless ALEOS operating system, specifically affecting the ACEManager component. This issue manifests as a loop with an unreachable exit condition, creating a scenario where the affected system becomes unresponsive to legitimate commands while maintaining operational functionality for other router services. The flaw exists in the software implementation of the ACEManager service, which handles critical network management functions within the router's firmware ecosystem. The vulnerability is particularly concerning because it allows remote attackers to initiate a denial of service condition without requiring authentication or privileged access, making it accessible to any network entity capable of reaching the target device. The affected system demonstrates a classic software design flaw where control flow logic fails to properly account for all possible execution paths, resulting in a condition where a loop continues indefinitely due to missing or incorrectly implemented exit criteria.
The technical impact of this vulnerability extends beyond simple service disruption as it fundamentally compromises the router's ability to process management commands and maintain its operational state. When the infinite loop is triggered, the ACEManager service becomes unresponsive to commands, effectively rendering the router's management interface inaccessible while leaving other network functions operational. This selective service degradation creates a scenario where network administrators cannot remotely monitor or configure the device, potentially leading to extended outages while other network services continue to operate normally. The vulnerability's classification as a CWE-835 - Loop with Unreachable Exit Condition - indicates a fundamental flaw in the program's control flow structure where the loop termination condition cannot be met under normal operating circumstances, often due to missing break conditions or incorrect logical operators within the loop construct.
From an operational perspective, this vulnerability creates significant risk for network infrastructure deployment as it allows attackers to remotely disable critical management functions without causing complete system failure. The requirement for device restart to clear the condition indicates that the flaw does not cause permanent system damage but rather creates a persistent denial of service state that requires physical or remote administrative intervention to resolve. Network administrators must maintain awareness of this vulnerability as it can be exploited by attackers seeking to disrupt network management operations, potentially leading to extended periods of reduced network visibility and control. The vulnerability affects the availability aspect of the CIA triad by specifically targeting the system's ability to provide management services while maintaining operational integrity in other areas. The attack surface is particularly concerning given that the flaw exists in network infrastructure devices that are typically exposed to untrusted networks and may be subject to remote exploitation attempts.
Mitigation strategies for CVE-2023-40458 should focus on immediate firmware updates from Sierra Wireless to address the underlying infinite loop implementation issue. Organizations should implement network segmentation to limit access to affected devices and monitor for unusual traffic patterns that might indicate exploitation attempts. The vulnerability aligns with ATT&CK technique T1499.004 - Endpoint Denial of Service, which describes methods for causing service unavailability through software flaws. Network administrators should establish monitoring procedures to detect service degradation in ACEManager functionality and implement automated alerting systems to notify administrators of potential exploitation attempts. The remediation process should include thorough testing of firmware updates in controlled environments before deployment to production networks, ensuring that the patch does not introduce compatibility issues with existing network configurations. Additionally, organizations should consider implementing network access controls to limit exposure of affected devices to untrusted networks and establish incident response procedures specifically addressing this type of denial of service vulnerability to minimize operational impact during exploitation events.