Tenda AC7 Routers Vulnerability Let Attackers Gain Root Shell With Malicious Payload
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A severe vulnerability in Tenda AC7 Routers running firmware version V15.03.06.44 allows malicious actors to execute arbitrary code and gain root shell access.
The flaw originates from a stack overflow vulnerability in the router’s formSetFirewallCfg function. Attackers can use a specially crafted HTTP request to completely compromise affected devices.
This discovery highlights ongoing security challenges in consumer networking equipment and underscores the need for manufacturers to implement robust input validation mechanisms.
The security flaw exists within the formSetFirewallCfg function of the Tenda AC7 router’s web management interface.
According to GitHub reports, the router fails to properly validate user input before processing it.
Specifically, when the router processes firewall configuration data submitted through the web interface, it directly copies the user-supplied value into a fixed-size buffer using the strcpy function without performing appropriate boundary checks.
Tenda AC7 Routers Vulnerability
The fundamental issue resides in how the router handles the “firewallEn” parameter. When a user submits data to the “/goform/SetFirewallCfg” endpoint, the router takes the submitted “firewallEn” value and copies it directly into a buffer using an unsafe string copy operation.
If an attacker submits data larger than the allocated buffer size, it overflows onto adjacent memory locations, potentially overwriting crucial data structures, including the program counter register:
“This vulnerability is particularly dangerous because the attacker can control the execution flow of the program,” reads the report.
“By carefully crafting the payload, it’s possible to redirect execution to arbitrary code, effectively gaining complete control over the device.”
Proof of Concept Exploitation
Researchers developed a proof-of-concept (PoC) exploit demonstrating the vulnerability.
The exploit consists of a Python script that sends a specially crafted HTTP POST request to the vulnerable router. The script targets the “/goform/SetFirewallCfg” endpoint with an oversized “firewallEn” parameter, triggering the stack overflow condition.
The following code snippet illustrates the core of the exploit:
In initial testing, researchers confirmed that submitting an excessively long string of characters in the “firewallEn” parameter successfully triggers a denial-of-service condition, causing the router to crash.
Denial of Service (DoS) AttacK
More concerning, however, is that further refinement of the payload could allow attackers to maintain persistent access by establishing a root shell on the compromised device.
This vulnerability has significant security implications for owners of Tenda AC7 routers.
Attackers within the same network as a vulnerable router could potentially exploit this flaw to gain complete control over the device, intercept network traffic, or use the router as a launching point for attacks against other devices on the network.
Users of Tenda AC7 routers are strongly advised to check for firmware updates from the manufacturer and apply them immediately if available.
In the absence of an official patch, network administrators should consider implementing additional security measures, such as restricting access to the router’s management interface to trusted devices only.
As connectivity becomes increasingly ubiquitous, manufacturers must prioritize security by implementing proper input validation, using memory-safe programming practices, and responding promptly to reported vulnerabilities.
#Cyber_Security #Cyber_Security_News #Vulnerability #cyber_security #cyber_security_news
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Tenda AC7 Routers Vulnerability Let Attackers Gain Root Shell With Malicious Payload
Author: KaaviyaA severe vulnerability in Tenda AC7 Routers running firmware version V15.03.06.44 allows malicious actors to execute arbitrary code and gain root shell access.
The flaw originates from a stack overflow vulnerability in the router’s formSetFirewallCfg function. Attackers can use a specially crafted HTTP request to completely compromise affected devices.
This discovery highlights ongoing security challenges in consumer networking equipment and underscores the need for manufacturers to implement robust input validation mechanisms.
The security flaw exists within the formSetFirewallCfg function of the Tenda AC7 router’s web management interface.
According to GitHub reports, the router fails to properly validate user input before processing it.
Specifically, when the router processes firewall configuration data submitted through the web interface, it directly copies the user-supplied value into a fixed-size buffer using the strcpy function without performing appropriate boundary checks.
Tenda AC7 Routers Vulnerability
The fundamental issue resides in how the router handles the “firewallEn” parameter. When a user submits data to the “/goform/SetFirewallCfg” endpoint, the router takes the submitted “firewallEn” value and copies it directly into a buffer using an unsafe string copy operation.
If an attacker submits data larger than the allocated buffer size, it overflows onto adjacent memory locations, potentially overwriting crucial data structures, including the program counter register:
“This vulnerability is particularly dangerous because the attacker can control the execution flow of the program,” reads the report.
“By carefully crafting the payload, it’s possible to redirect execution to arbitrary code, effectively gaining complete control over the device.”
Proof of Concept Exploitation
Researchers developed a proof-of-concept (PoC) exploit demonstrating the vulnerability.
The exploit consists of a Python script that sends a specially crafted HTTP POST request to the vulnerable router. The script targets the “/goform/SetFirewallCfg” endpoint with an oversized “firewallEn” parameter, triggering the stack overflow condition.
The following code snippet illustrates the core of the exploit:
In initial testing, researchers confirmed that submitting an excessively long string of characters in the “firewallEn” parameter successfully triggers a denial-of-service condition, causing the router to crash.
Denial of Service (DoS) AttacKMore concerning, however, is that further refinement of the payload could allow attackers to maintain persistent access by establishing a root shell on the compromised device.
This vulnerability has significant security implications for owners of Tenda AC7 routers.
Attackers within the same network as a vulnerable router could potentially exploit this flaw to gain complete control over the device, intercept network traffic, or use the router as a launching point for attacks against other devices on the network.
Users of Tenda AC7 routers are strongly advised to check for firmware updates from the manufacturer and apply them immediately if available.
In the absence of an official patch, network administrators should consider implementing additional security measures, such as restricting access to the router’s management interface to trusted devices only.
As connectivity becomes increasingly ubiquitous, manufacturers must prioritize security by implementing proper input validation, using memory-safe programming practices, and responding promptly to reported vulnerabilities.
#Cyber_Security #Cyber_Security_News #Vulnerability #cyber_security #cyber_security_news
Оригинальная версия на сайте:
