CVE-2023-47005 in RT-AX57
Summary
by MITRE • 11/09/2023
An issue in ASUS RT-AX57 v.3.0.0.4_386_52041 allows a remote attacker to execute arbitrary code via a crafted request to the lan_ifname field in the sub_ln 2C318 function.
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Analysis
by VulDB Data Team • 12/05/2023
The vulnerability identified as CVE-2023-47005 affects ASUS RT-AX57 routers running firmware version 3.0.0.4_386_52041 and represents a critical remote code execution flaw that can be exploited by attackers without authentication. This vulnerability exists within the router's web interface handling mechanism, specifically targeting the lan_ifname parameter within the sub_ln 2C318 function. The flaw stems from inadequate input validation and sanitization processes that fail to properly handle maliciously crafted requests, creating an exploitable path for remote attackers to inject and execute arbitrary code on the affected device.
The technical implementation of this vulnerability involves a classic buffer overflow or injection attack vector where the lan_ifname field receives unvalidated user input that gets processed without proper sanitization. This creates a condition where an attacker can craft a malicious HTTP request containing specially formatted data that, when processed by the sub_ln 2C318 function, triggers unintended code execution. The vulnerability operates at the application layer and leverages the router's web management interface as the attack surface, making it accessible over the network without requiring physical access or prior authentication credentials. This type of vulnerability is classified under CWE-121 as a stack-based buffer overflow, though the exact implementation may involve more complex injection patterns typical of command injection or code execution flaws.
The operational impact of this vulnerability extends beyond simple unauthorized access to encompass full system compromise of the affected router. Once exploited, an attacker gains complete control over the router's operating system, enabling them to modify network configurations, redirect traffic, install malware, or establish persistent backdoors. The compromised device can then be used as a pivot point for attacking other devices within the local network or as a command and control server for broader attacks. Additionally, the router's role as a network gateway means that successful exploitation can lead to complete network infiltration and potentially compromise all connected devices. This vulnerability directly aligns with ATT&CK technique T1059.007 for command and script interpreters, as the exploitation involves executing code through the router's command processing mechanisms.
Mitigation strategies for CVE-2023-47005 require immediate firmware updates from ASUS to address the underlying input validation flaws in the affected router models. Network administrators should implement strict firewall rules to restrict access to the router's management interfaces from untrusted networks and consider implementing network segmentation to limit the potential impact of successful exploitation. The affected devices should be isolated from critical network segments until proper patches are applied, and continuous monitoring should be implemented to detect any suspicious network activity or unauthorized configuration changes. Organizations should also conduct thorough network assessments to identify all instances of the vulnerable firmware versions and establish incident response procedures to handle potential exploitation attempts. Security teams should consider implementing network-based intrusion detection systems that can identify and block malicious requests targeting this specific vulnerability pattern, as the attack signature is well-defined and predictable once the exploitation method is understood.