CVE-2017-17762 Scanner

Episerver is a popular content management system (CMS) used by organizations for creating, managing, and delivering digital content for websites and online applications. It is utilized by developers, content creators, and businesses aiming to provide a dynamic and engaging online user experience. Episerver offers a robust platform for managing enterprise-level websites and e-commerce platforms, allowing organizations to personalize and streamline digital marketing efforts. It is favored by medium to large enterprises that require powerful CMS capabilities combined with scalability and flexibility. Providing support for various plugins and integrations, Episerver helps in enhancing the functionality and efficiency of web management.

The XML External Entity (XXE) vulnerability detected in Episerver allows attackers to exploit the way XML data is processed. An attacker can send specially crafted XML DTD requests to extract sensitive information or perform unauthorized actions. XXE vulnerabilities are commonly exploited to read arbitrary files from the server, leading to data breaches. It results in information disclosure, exposing confidential data such as configuration files or user credentials. Organizations using affected versions are at risk of unauthorized access to sensitive data if the vulnerability is not addressed. Effective protection against XXE requires updating to secure software versions and applying patches that mitigate this type of attack.

The vulnerability resides in the XML processing of Episerver, specifically in the endpoint util/xmlrpc/Handler.ashx. By injecting malicious XML payloads, an attacker can access server files due to the system's improper handling of external entities within XML documents. The vulnerable parameter allows communication with external resources, making it possible to extract sensitive data or interact with other systems. Attackers utilize XXE injection techniques, embedding commands and expectations into XML data to retrieve server-side information. The process involves examining server responses to these crafted requests, potentially revealing critical internal details. Awareness of this endpoint's weaknesses ensures better defensive measures are implemented in newer software releases.

Exploiting the vulnerability may lead to significant data compromise, as attackers can read confidential files from affected systems. Information disclosure could include exposure of user data, security credentials, and sensitive configuration files. Such breaches risk customer trust, legal implications, and financial losses, especially for businesses handling private user information. Attackers could use retrieved data for further exploitation, including social engineering, identity theft, or launching more attacks on the organization. Prompt remediation by applying security patches or upgrading to fixed software versions is essential in protecting against these adverse effects. Continuous system monitoring and auditing help detect potential exploitation attempts and fortify defenses.

REFERENCES

• https://gist.github.com/jonaslejon/5f92779848360a1a1e676af0795bd9aa
• https://kryptera.se/sarbarhet-i-episerver/
• https://github.com/ARPSyndicate/cvemon