CVE-2019-19822 Scanner

TOTOLINK/Realtek routers are commonly used networking devices that ensure internet connectivity in residential and commercial environments. Developed by Totolink, these routers are part of a series of networking products that aim to provide reliable and high-speed internet solutions. They are favored for their ease of use, versatility, and robust settings options that cater to various network setups. The devices often include features such as advanced firewall settings, parental controls, and multiple SSID broadcasts. TOTOLINK routers are employed widely for both home use and small business environments for seamless online access. The configurations enabled by these routers are managed through an administration interface which is critical for network security and performance optimization.

This information disclosure vulnerability exists in TOTOLINK/Realtek routers, allowing unauthorized users to access sensitive configuration data. The vulnerability presents serious security risks as attackers can potentially extract critical information, such as credentials, from devices running specific TOTOLINK firmware versions. Affected routers utilize a Realtek APMIB and can be exploited by remotely accessing the "config.dat" file. This vulnerability indicates insufficient access controls and can potentially lead to unauthorized data extraction from the router's admin panel. Neglecting to patch or secure affected router models can leave networks susceptible to further attacks. Thus, addressing this vulnerability is crucial for maintaining network integrity.

The technical details of this vulnerability involve accessing a particular endpoint that contains configuration data without requiring authentication. Remote attackers can exploit the TOTOLINK routers by simply sending a GET request to the path including "config.dat". When this request is successfully executed, it returns the plaintext configuration, which contains sensitive details. In affected devices, checks on the server response header, like "server" being "boa" and status code 200, confirm the presence of the issue. This problem is evident in Realtek SDK-based routers, making it vital for users to ensure their devices do not revert to insecure configurations.

When exploited, this vulnerability can lead to critical information disclosure, where attackers gain access to confidential settings, including passwords. Such access can facilitate unauthorized network changes or setup, leading to potentially greater security holes. Additionally, leaked credentials could be used for various malicious activities, including setting up backdoors or launching Man-In-The-Middle attacks. Sensitive personal and organizational data may be at risk, putting users' privacy and networks in jeopardy. Addressing this vulnerability is imperative to prevent compromise of network devices and protect against unauthorized access.

REFERENCES

• http://packetstormsecurity.com/files/156083/Realtek-SDK-Information-Disclosure-Code-Execution.html
• https://nvd.nist.gov/vuln/detail/CVE-2019-19822