CVE-2022-26991 in SBR-AC1900P
Summary
by MITRE • 03/16/2022
Arris routers SBR-AC1900P 1.0.7-B05, SBR-AC3200P 1.0.7-B05 and SBR-AC1200P 1.0.5-B05 were discovered to contain a command injection vulnerability in the ntp function via the TimeZone parameter. This vulnerability allows attackers to execute arbitrary commands via a crafted request.
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Analysis
by VulDB Data Team • 03/18/2022
The CVE-2022-26991 vulnerability affects Arris routers including models SBR-AC1900P, SBR-AC3200P, and SBR-AC1200P with specific firmware versions. This represents a critical command injection flaw within the Network Time Protocol implementation of these devices. The vulnerability manifests through the TimeZone parameter in the ntp function, which fails to properly sanitize user input before processing. This weakness allows attackers to inject malicious commands that execute with the privileges of the affected service, potentially compromising the entire network infrastructure.
The technical exploitation of this vulnerability stems from inadequate input validation and sanitization within the router's web interface. When a crafted TimeZone parameter is submitted to the ntp function, the system fails to properly escape or filter special characters that could be interpreted as command delimiters or operators. This allows threat actors to inject arbitrary shell commands that are subsequently executed by the underlying operating system. The vulnerability resides in the device's handling of user-supplied data without proper security controls, making it susceptible to various attack vectors including but not limited to remote code execution, privilege escalation, and persistent backdoor installation.
From an operational perspective, this vulnerability poses significant risks to network security and integrity. Attackers who successfully exploit this flaw can gain unauthorized access to the router's command execution environment, potentially leading to complete device compromise. The implications extend beyond individual device compromise as these routers often serve as primary network gateways, making them attractive targets for attackers seeking to establish persistent access points within network environments. The vulnerability could enable attackers to modify network configurations, redirect traffic, install malicious software, or use the compromised devices as launching points for further attacks against internal network resources.
The vulnerability aligns with CWE-77 and CWE-94 classifications, representing command injection and code injection weaknesses respectively. It also maps to several ATT&CK techniques including T1059.004 for command and script injection, T1068 for local privilege escalation, and T1566 for social engineering through malicious network traffic. Organizations should prioritize immediate firmware updates from Arris to address this vulnerability, as the affected models represent widely deployed consumer and small office network equipment. Network segmentation and monitoring of unusual network traffic patterns can serve as interim mitigation measures while permanent solutions are implemented. Additionally, implementing proper input validation controls and secure coding practices in similar network device implementations would prevent similar vulnerabilities from occurring in future deployments.