CVE-2021-47795 Scanner

GeoVision GeoWebServer is utilized by organizations to manage video surveillance and security systems over a network. The software is primarily used by businesses and governmental entities for monitoring, recording, and analyzing video footage for security purposes. It provides an interface for controlling various camera functions and accessing video streams remotely. GeoWebServer is known for its compatibility with a broad range of GeoVision products, offering a centralized management solution. The software also supports different add-ons and integrations, enhancing its functionality for diverse use cases. Its deployment often spans multiple locations connected over a secure network, offering robust features and flexibility for security management needs.

The vulnerability involves improper sanitization of user-supplied input in the WebStrings.srf endpoint. This flaw allows an unauthenticated attacker to perform local file inclusion and cross-site scripting attacks. By exploiting this vulnerability, an attacker can read arbitrary files from the server. Moreover, they can inject malicious scripts that can execute in the victim's browser, potentially leading to the exposure of sensitive data. The vulnerability poses a significant risk due to its potential impact on server confidentiality and client-side security. The dual nature of this vulnerability requires addressing both file inclusion and scripting issues to mitigate risks effectively.

The vulnerability is located in the WebStrings.srf endpoint, where user input is not properly sanitized. A key parameter, 'file,' allows attackers to perform directory traversal using sequences like '../' to access files outside the intended directory. Additionally, the 'obj_name' parameter is vulnerable to XSS, permitting script injection. The endpoint's lack of input validation is the primary cause, a common issue in many applications allowing attackers to exploit web application logic flaws. Proper parameter handling and output encoding are absent, making these attacks feasible. Understanding the specifics of the vulnerable endpoint assists developers in crafting a comprehensive mitigation strategy.

When exploited, this vulnerability allows attackers to access sensitive server files, potentially containing configuration or system information. The XSS vector additionally increases the risk of client-side script execution, which could lead to credential capture or unauthorized actions on behalf of users. Successful exploitation can breach data confidentiality, integrity, and availability, affecting both server and client-side security. The information disclosed through LFI could aid in further attacks, such as privilege escalation or remote code execution. Thus, the exploitation of this flaw can severely compromise the affected system's overall security.

REFERENCES

• https://www.exploit-db.com/exploits/50211
• https://www.geovision.com.tw/cyber_security.php
• https://nvd.nist.gov/vuln/detail/CVE-2021-47795