Severity: HIGH
Description: In RAONWIZ K Upload v2018.0.2.51 and prior, automatic update processing without integrity check on update module(web.js) allows an attacker to modify arguments which causes downloading a random DLL and injection on it.
CVSS Score: 8.7
B
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1. Risk Assessment
The vulnerability CVE-2020-7808 resides in RAONWIZ K Upload, specifically in the automatic update process. The core issue is a lack of integrity checking when downloading and injecting a DLL during updates. This allows an attacker to potentially modify arguments during the update process, leading to the download and injection of a malicious DLL. The base CVSS score of 8.7 (HIGH) indicates a significant risk. The vulnerability’s impact is high in terms of Availability and Confidentiality, meaning a successful exploit could lead to system crashes or data breaches. Integrity is not directly impacted, but the compromised DLL could lead to subsequent integrity issues. The attack complexity is rated as High, suggesting exploitation requires some skill and potentially specific network positioning. However, the attack vector is Network, meaning it can be exploited remotely without user interaction, increasing the likelihood of exploitation. The business impact could range from service disruption to potential data compromise depending on the role of the K Upload software within the organization.
2. Potential Attack Scenarios
An attacker can leverage this vulnerability by intercepting the update process. The attacker modifies the arguments of the update request (web.js) to point to a server they control, hosting a malicious DLL. When K Upload automatically updates, it downloads and injects the attacker’s DLL. This DLL could perform a variety of malicious actions, such as stealing credentials, establishing a backdoor, or causing a denial-of-service. For example, the attacker could modify the update arguments to download a DLL that exfiltrates user login information stored within the K Upload application. The attack process involves: 1. Identifying a system running a vulnerable version of K Upload. 2. Intercepting the update traffic (potentially through man-in-the-middle attack or by compromising a server the K Upload instance communicates with). 3. Modifying the arguments in the web.js update module to point to the attacker’s malicious DLL. 4. Allowing the automatic update to proceed, resulting in the injection of the malicious DLL. The potential outcome is a compromised system with the attacker gaining control or access to sensitive information.
3. Mitigation Recommendations
The primary mitigation is to update RAONWIZ K Upload to a version higher than 2018.0.2.51, ensuring the updated version includes the necessary integrity checks for update modules. Immediate action should be taken to patch all vulnerable instances. Secondary mitigations include network segmentation to limit the blast radius if a compromise occurs. Monitor network traffic for unusual outbound connections from systems running K Upload, particularly after an update. Consider implementing web application firewall (WAF) rules to inspect and filter update traffic, looking for anomalies or unexpected destinations. Refer to the following resource for further details: https://www.boho.or.kr/krcert/secNoticeView.do?bulletin_writing_sequence=35424. Additionally, regularly review update processes and ensure integrity checks are implemented wherever possible.
4. Executive Summary
RAONWIZ K Upload software is vulnerable to a high-severity security flaw (CVE-2020-7808) that could allow attackers to remotely compromise systems. The vulnerability stems from a lack of integrity checking during the automatic update process, allowing an attacker to inject a malicious DLL. A successful exploit could lead to data breaches or service disruptions. The risk is significant, and prompt action is crucial. We recommend immediately updating all vulnerable instances of K Upload to a version higher than 2018.0.2.51. This update will ensure the integrity of the update module and prevent attackers from easily injecting malicious code. Addressing this vulnerability is important for maintaining the confidentiality, availability, and overall security of systems utilizing K Upload. Failing to patch could result in potential financial or reputational damage.