CVE-2022-26995 in TR3300
Summary
by MITRE • 03/16/2022
Arris TR3300 v1.0.13 was discovered to contain a command injection vulnerability in the pptp (wan_pptp.html) function via the pptp_fix_ip, pptp_fix_mask, pptp_fix_gw, and wan_dns1_stat parameters. 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-2022-26995 vulnerability represents a critical command injection flaw discovered in Arris TR3300 routers running firmware version 1.0.13. This vulnerability specifically affects the pptp function within the web interface, targeting the wan_pptp.html page and its associated parameters. The affected parameters include pptp_fix_ip, pptp_fix_mask, pptp_fix_gw, and wan_dns1_stat, which collectively provide attackers with multiple entry points for executing malicious commands on the affected device. The vulnerability stems from insufficient input validation and sanitization within the router's web application, allowing unauthorized users to inject arbitrary commands that are subsequently executed with the privileges of the web server process. This presents a significant security risk as it enables remote code execution capabilities that could be leveraged to compromise the entire network infrastructure.
The technical implementation of this vulnerability falls under the CWE-77 attack pattern classification, specifically representing a command injection weakness where user-supplied data is directly incorporated into system commands without proper sanitization. The ATT&CK framework categorizes this as a command and control activity under the T1059.001 technique, where adversaries establish persistence and execute arbitrary code on compromised systems. The vulnerability's exploitation requires a crafted HTTP request that targets the vulnerable web interface parameters, allowing attackers to bypass authentication mechanisms and directly manipulate the router's underlying operating system. This type of vulnerability is particularly dangerous because it operates at the application layer, where the web server processes user input and translates it into system commands, creating a direct pathway for attackers to execute malicious code on the device.
The operational impact of CVE-2022-26995 extends beyond simple unauthorized access, as it enables attackers to gain full control over the router's functionality and potentially compromise the entire network. Successful exploitation allows threat actors to modify network configurations, redirect traffic through malicious proxies, install backdoors, and establish persistent access points for further network infiltration. The vulnerability's presence in a consumer-grade router like the Arris TR3300 means that it affects numerous network environments including residential and small business setups where network security may be inadequate. Additionally, the attack surface is broad since the vulnerability affects multiple parameters within the PPTP configuration section, providing attackers with various methods to achieve their objectives. The lack of proper input validation means that even seemingly benign requests could contain malicious payloads that are executed without proper authorization, making detection and prevention particularly challenging for network administrators.
Mitigation strategies for CVE-2022-26995 should prioritize immediate firmware updates from Arris to address the identified command injection vulnerability. Network administrators should implement network segmentation to limit the exposure of affected devices to unauthorized users and establish strict access controls for router management interfaces. The implementation of web application firewalls and intrusion detection systems can help detect and prevent exploitation attempts by monitoring for suspicious parameter values in HTTP requests. Regular network scanning should be conducted to identify other potentially vulnerable devices within the network infrastructure, as similar vulnerabilities may exist in other router models or firmware versions. Additionally, administrators should disable unnecessary services such as PPTP if they are not required for network operations, reducing the attack surface. The vulnerability underscores the importance of secure coding practices and proper input validation in web applications, as highlighted by industry standards such as the OWASP Top Ten and NIST cybersecurity guidelines, which emphasize the need for robust sanitization of user inputs to prevent injection attacks.