CVE-2022-26997 in TR3300
Summary
by MITRE • 03/16/2022
Arris TR3300 v1.0.13 was discovered to contain a command injection vulnerability in the upnp function via the upnp_ttl 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-2022-26997 vulnerability represents a critical command injection flaw in Arris TR3300 routers running firmware version 1.0.13. This vulnerability specifically targets the upnp function within the router's web interface, where the upnp_ttl parameter fails to properly validate or sanitize user input. The flaw exists in the Universal Plug and Play implementation that allows devices to automatically configure network settings and port forwarding. When an attacker crafts a malicious request containing specially formatted input in the upnp_ttl parameter, the router's processing logic directly incorporates this unvalidated input into system commands without adequate sanitization. This creates a dangerous condition where arbitrary command execution becomes possible, potentially allowing attackers to gain full control over the affected device.
The technical exploitation of this vulnerability follows established patterns for command injection attacks and aligns with CWE-77 which categorizes improper neutralization of special elements used in commands. The vulnerability falls under the broader category of CWE-94, which describes execution of arbitrary code or commands, and specifically demonstrates how insufficient input validation in network services can lead to complete system compromise. Attackers can leverage this flaw to execute system commands with the privileges of the web server process, potentially escalating to root access depending on the router's implementation. The attack vector is particularly concerning as it requires no authentication, making it an unauthenticated remote code execution vulnerability that can be exploited over the network.
The operational impact of CVE-2022-26997 extends beyond simple command execution, as it can enable attackers to establish persistent access to the network infrastructure. Once compromised, the router can serve as a pivot point for lateral movement within the network, potentially allowing attackers to access other connected devices, intercept network traffic, or modify network configurations. The vulnerability affects the core networking functionality of the device, meaning that even legitimate users may experience service disruption or unauthorized modifications to their network settings. This type of vulnerability is particularly dangerous in enterprise environments where routers serve as critical network infrastructure components, and in residential settings where compromised devices can provide attackers with access to entire home networks.
Mitigation strategies for this vulnerability should include immediate firmware updates from Arris to address the command injection flaw in the upnp implementation. Network administrators should also implement network segmentation to limit the potential impact of compromised devices and deploy intrusion detection systems to monitor for suspicious traffic patterns that may indicate exploitation attempts. The vulnerability demonstrates the importance of input validation in network services and aligns with ATT&CK technique T1059 which covers command and scripting interpreters. Organizations should also consider disabling unnecessary services like UPnP when not required, as this reduces the attack surface and limits potential exploitation vectors. Additionally, regular security assessments of network infrastructure devices are essential to identify similar vulnerabilities that may exist in other network equipment.