CVE-2021-22952 in Talk Application
Summary
by MITRE • 09/24/2021
A vulnerability found in UniFi Talk application V1.12.3 and earlier permits a malicious actor who has already gained access to a network to subsequently control Talk device(s) assigned to said network if they are not yet adopted. This vulnerability is fixed in UniFi Talk application V1.12.5 and later.
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Analysis
by VulDB Data Team • 10/02/2021
The vulnerability identified as CVE-2021-22952 represents a critical security flaw within the UniFi Talk application ecosystem that specifically affects versions 1.12.3 and earlier. This vulnerability operates within the context of network security where an attacker who has already achieved initial network access can escalate their privileges to gain full control over unadopted Talk devices within the same network segment. The flaw essentially creates a pathway for lateral movement and device compromise that undermines the fundamental security assumptions of network isolation and device authentication mechanisms.
The technical root cause of this vulnerability lies in the insufficient validation and authentication mechanisms implemented during the device adoption process within the UniFi Talk application. When devices are assigned to a network but remain unadopted, the system should maintain strict security boundaries that prevent unauthorized access or control. However, this vulnerability allows malicious actors to exploit a gap in the authentication flow, enabling them to assume control over these unadopted devices without proper authorization. The vulnerability specifically impacts the device management protocols and adoption workflows, where the system fails to properly verify the legitimacy of control requests for unadopted devices.
From an operational impact perspective, this vulnerability creates a significant risk for organizations using UniFi Talk systems as it transforms a network-level compromise into a full device control compromise. Once an attacker gains access to the network, they can immediately begin targeting unadopted devices without requiring additional authentication credentials or complex exploitation techniques. This represents a severe weakening of the security model where the adoption status of devices becomes irrelevant to their security posture. The vulnerability affects the confidentiality, integrity, and availability of the affected devices, potentially allowing attackers to manipulate device configurations, access sensitive communications, or use the compromised devices as entry points for further attacks within the network infrastructure.
The security implications of CVE-2021-22952 align with several common attack patterns documented in the ATT&CK framework, particularly those related to lateral movement and privilege escalation. Attackers can leverage this vulnerability to move laterally within a network environment without requiring additional credentials or complex exploitation methods. This vulnerability also relates to CWE-284, which addresses improper access control, and CWE-306, which covers missing authentication. Organizations that deploy UniFi Talk systems must consider this vulnerability as part of their broader security posture assessment, particularly in environments where network segmentation is not robust enough to prevent unauthorized access to device management interfaces. The remediation strategy should include immediate upgrade to UniFi Talk application version 1.12.5 or later, which implements proper authentication checks and device adoption validation mechanisms. Additionally, network administrators should conduct thorough inventory audits to identify all unadopted devices that may be at risk and implement network segmentation strategies to limit the potential impact of such vulnerabilities in future scenarios.