CVE-2021-22017 Scanner

This vulnerability scanner targets vCenter Server, a leading server management platform used globally by organizations to manage virtualized environments. Developed by VMware, vCenter Server allows for centralized management of virtual infrastructures, making it a popular choice for IT departments in enterprises. It is commonly used in various industries for improving operational efficiency and flexibility of data centers. The vulnerability under scrutiny primarily affects administrators and users who oversee server configurations and operations. This scanner aims to identify weaknesses in the server's access control mechanisms to prevent unauthorized access.

The Improper Access Control vulnerability in vCenter Server allows attackers to bypass proxy restrictions. As a result of this loophole, internal endpoints intended to be secured can be accessed by unauthorized users. This vulnerability stems from a flaw in the implementation of URI normalization within vCenter Server's Rhttproxy. It poses significant risks due to the potential for information disclosure and other unauthorized activities within the internal network. Malicious actors can exploit this vulnerability if they have network access to port 443 on the server.

Technically, the vulnerability arises when vCenter Server's URI normalization does not process input correctly, allowing malicious individuals to bypass security controls. Specifically, attackers can craft HTTP requests that exploit improper URI handling, potentially reaching internal endpoints. The vulnerable endpoint involves Rhttproxy service, making it a critical aspect to monitor. Parameters within HTTP requests can be manipulated, circumventing expected access controls. This situation indicates a lack of sufficient sanitization in the input processing stage.

If exploited, this vulnerability can result in unauthorized access to sensitive information, leading to potential information leaks. Malicious users can navigate supposedly secure network areas, heightening the risk of further network exploitation. Bypassing access controls compromises data integrity and confidentiality and can facilitate additional attacks or breaches. The implications of such breaches, especially in organizational settings, include financial loss, reputation damage, and a breakdown in network security.

REFERENCES

• https://github.com/wangsir01/docs/blob/7c20bbf43ae467c1bdc54c65c9a3230ae3e81d63/CVE-2021-22017-22005%E6%A8%A1%E6%9D%BF%E6%B3%A8%E5%85%A5%E5%88%86%E6%9E%90/CVE-2021-22017-22005%E6%A8%A1%E6%9D%BF%E6%B3%A8%E5%85%A5%E5%88%86%E6%9E%90.md
• https://www.vmware.com/security/advisories/VMSA-2021-0020.html
• https://nvd.nist.gov/vuln/detail/CVE-2021-22017