CVE-2021-30119 is an authenticated reflective cross-site scripting (XSS) vulnerability found in the Kaseya VSA product. This vulnerability allows attackers to inject malicious scripts into web pages, which can then be executed in the context of a user's session. The affected functionality is located in the HelpDeskTab/rcResults.asp and done.asp scripts, where user-provided parameters are insecurely returned on the web page. For example, injecting a script via the result parameter can enable an attacker to access sensitive data such as cookies.
The CVSS score for this vulnerability is 5.4, classifying it as medium severity. This score reflects a low attack complexity and the requirement for user interaction, as a user must access the compromised page for the attack to succeed. The vulnerability could lead to unauthorized access to user sessions, thereby threatening confidentiality and integrity.
Risk to organizations includes potential leakage of sensitive information and unauthorized actions performed in the context of the affected user. Given the nature of the vulnerability and its exploitation potential, it is crucial for organizations utilizing Kaseya VSA to address this issue promptly.
As of now, there are no known exploits available for this vulnerability, but organizations should remain vigilant and prioritize patching to mitigate risks. Organizations should prioritize patching immediately.
This vulnerability was published on July 9, 2021, and has since been classified as modified due to ongoing developments in the threat landscape.
Vulnerability Details
CVE-2021-30119 describes an authenticated reflective XSS in Kaseya VSA. Specifically, the parameter result of /HelpDeskTab/rcResults.asp is improperly returned, allowing for script injection. The same vulnerability also affects the FileName parameter of /done.asp. Official references provide details on the vector and potential impact of this vulnerability.
The CVSS 3.1 vector string for this vulnerability is CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N, indicating a medium severity level with a base score of 5.4. This vulnerability affects all versions of Kaseya VSA prior to 9.5.7.
Technical Analysis
The root cause of CVE-2021-30119 is the failure to properly validate and sanitize user input in the affected scripts. Attackers can exploit this by crafting a request that includes malicious JavaScript code in parameters like result or FileName. The attack vector is network-based, requiring the attacker to lure a victim to visit a specially crafted URL.
The attack complexity is low, as it does not require special conditions to be met beyond user interaction. Privileges required are also low, as an attacker only needs to be an authenticated user. User interaction is required, meaning the victim must click on a link or submit a form containing the malicious payload.
Regarding impacts, confidentiality is affected as attackers may gain access to cookies and session tokens. Integrity impacts are also present, as attackers can manipulate the content viewed by the user. However, there is no impact on availability.
Risk & Impact Analysis
Organizations using Kaseya VSA should be aware that the exploitation of this vulnerability could lead to significant security incidents. The potential for attackers to execute scripts in the context of authenticated users poses a serious risk, particularly in environments where sensitive information is managed. The blast radius for this vulnerability could extend to all users who interact with the affected components.
Given the CVSS score of 5.4, organizations should address this vulnerability in their priority patch cycle. Additionally, the absence of known exploits does not mitigate the urgency of remediation; proactive measures should be taken to secure applications.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerable versions of Kaseya VSA include all versions prior to 9.5.7. Organizations should ensure they are running the latest version to mitigate this vulnerability.
Mitigation & Remediation
Organizations are strongly encouraged to apply the latest patches provided by Kaseya. For remediation, organizations should upgrade to version 9.5.7 or later, where this vulnerability has been addressed. In the absence of immediate patching, organizations may consider implementing additional security controls such as input validation and output encoding.
For a comprehensive approach to security, organizations should engage in penetration testing to identify similar weaknesses.
Detection Guidance
Organizations should monitor logs for unusual patterns that may indicate exploitation attempts. Behavioral anomalies, such as unexpected scripts being executed in user sessions, should also be investigated. Network signatures that correspond to known attack patterns for XSS vulnerabilities can enhance detection efforts.
AppSecure Threat Intelligence Insight
CVE-2021-30119 reflects ongoing issues with input validation in web applications, highlighting a common flaw in web security. Security teams should learn from this incident to strengthen their defenses against similar vulnerabilities. Regular security assessments, including vulnerability management programs, can play a critical role in identifying and remediating such weaknesses.
This case underscores the importance of proactive security measures and highlights the need for organizations to maintain awareness of vulnerabilities impacting their software. Engaging in penetration testing methodologies can further strengthen an organization’s security posture against emerging threats.
In conclusion, organizations must prioritize securing their web applications, as vulnerabilities like CVE-2021-30119 can lead to significant security breaches if not addressed in a timely manner.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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