CVE-2023-25280 Scanner

D-Link DIR-820LA1 is a dual-band wireless router designed for residential and small business environments. It is commonly used for providing internet connectivity and network management with a web-based interface. The device supports remote management, which can be a target for attackers if improperly secured. Its firmware provides various administrative features, including network diagnostic tools like the ping function. These tools are accessible via web requests and can become attack vectors if input validation is inadequate. The affected firmware version FW105B03 contains a vulnerability that allows unauthorized users to inject system-level commands.

This scanner targets a critical Command Injection vulnerability identified as CVE-2023-25280. The flaw resides in the `ping_addr` parameter of the `ping.ccp` endpoint on D-Link DIR-820LA1 routers. It allows attackers to execute arbitrary OS commands without authentication by crafting malicious input. Because the vulnerability is remotely exploitable and requires no user interaction, it poses a serious risk to affected devices. Attackers can gain full control over the router’s operating system with root-level privileges. Exploiting this flaw may lead to system compromise and persistent backdoor access.

The vulnerability is triggered by sending a specially crafted HTTP POST request to `/ping.ccp` with a manipulated `ping_addr` parameter. The payload is injected using newline characters to bypass normal input handling, followed by arbitrary shell commands. If successful, the scanner confirms exploitation via an external callback service. Prior to this, the scanner checks for the presence of a D-Link interface by analyzing the initial HTTP response. This validation ensures that the scanner only proceeds if the target is a D-Link DIR-820LA1 device.

Successful exploitation allows unauthenticated attackers to execute arbitrary commands on the device with root privileges. This may lead to full compromise of the router, including altering configurations, extracting sensitive data, redirecting network traffic, or installing malware. Compromised devices can be used as entry points into internal networks or as part of large-scale botnets. The vulnerability significantly threatens user privacy, network availability, and data confidentiality. In some cases, it could render the device unusable or expose other devices on the network to additional risks.

REFERENCES

• https://github.com/migraine-sudo/D_Link_Vuln/tree/main/cmd%20Inject%20in%20pingV4Msg
• https://www.dlink.com/en/security-bulletin/