CVE-2019-3997 in SS3
Summary
by MITRE
Authentication bypass using an alternate path or channel in SimpliSafe SS3 firmware 1.0-1.3 allows a local, unauthenticated attacker to pair a rogue keypad to an armed system.
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Analysis
by VulDB Data Team • 03/24/2024
The vulnerability identified as CVE-2019-3997 represents a critical authentication flaw within the SimpliSafe SS3 security system firmware versions 1.0 through 1.3. This issue stems from inadequate authentication mechanisms that permit unauthorized local access to the security system through alternative pathways. The flaw specifically affects the pairing process of keypads with the central security system, creating a significant security weakness that undermines the fundamental integrity of the access control framework. The vulnerability exists at the firmware level, making it particularly concerning as it operates below the application layer where traditional security controls might be expected to function.
The technical implementation of this vulnerability allows a local attacker with physical access to the system to bypass standard authentication protocols by utilizing an alternate channel for keypad pairing. This occurs because the firmware does not properly validate the legitimacy of pairing requests or verify the authenticity of the device attempting to establish communication with the security system. The flaw essentially creates a backdoor mechanism where unauthorized keypads can be registered with an armed system without proper authentication, effectively rendering the security measures ineffective. This issue falls under the category of CWE-287, which addresses improper authentication vulnerabilities, and specifically relates to the broader class of authentication bypass flaws that can be exploited through alternative access paths.
The operational impact of this vulnerability is severe and directly compromises the security posture of any SimpliSafe SS3 system running the affected firmware versions. An attacker who gains local access to the system can potentially take complete control of the security infrastructure by pairing unauthorized devices that can then be used to disarm or rearm the system at will. This creates a scenario where the entire security ecosystem becomes compromised, as the attacker can manipulate the system without triggering any legitimate security alerts or notifications. The vulnerability is particularly dangerous because it can be exploited by individuals who already have physical access to the premises, making it difficult to detect and prevent through traditional network-based monitoring systems. This aligns with ATT&CK technique T1072, which covers software deployment methods that can be used to establish persistent access through legitimate system components.
Mitigation strategies for this vulnerability require immediate firmware updates from SimpliSafe to address the authentication bypass flaw. Organizations should also implement additional physical security measures to prevent unauthorized access to the security system hardware, including securing access to the central control unit and monitoring physical access points. Network segmentation and monitoring should be enhanced to detect unusual pairing activities or unauthorized device connections. The remediation process must include verification that all existing keypads are legitimate and that no rogue devices have been successfully paired with the system. Security teams should also consider implementing manual verification procedures for any new device pairing attempts, ensuring that physical security controls complement the digital authentication mechanisms. Additionally, regular security assessments should be conducted to identify similar vulnerabilities in other security system components and ensure that authentication mechanisms are properly validated across all access points.