CVE-2023-41642: Reflected Cross-site Scripting (XSS) Vulnerabilities in GruppoSCAI RealGimm 1.1.37p38 with PoC Exploit

Researchers have recently discovered multiple reflected cross-site scripting (XSS) vulnerabilities in the ErroreNonGestito.aspx component of GruppoSCAI RealGimm 1.1.37p38. These vulnerabilities can be exploited by attackers to execute arbitrary JavaScript code within the context of a victim user's browser. The vulnerable parameter is the VIEWSTATE value, which can be manipulated to deliver payloads containing malicious scripts.

Vulnerability Details

A detailed analysis of these vulnerabilities shows that the main reason behind this security breach is improper input validation in the VIEWSTATE parameter, which can be found on the ErroreNonGestito.aspx page. By injecting a malicious payload into this parameter, an attacker can exploit the vulnerabilities to execute their custom JavaScript code within the victim user's browser context. This can lead to a range of potential attack scenarios, such as stealing session cookies, redirecting users to phishing websites, or even installing malware on the victim's device.

Proof of Concept (PoC)

To demonstrate how the vulnerability can be exploited, consider the following code snippet used in the PoC:

<script>
  // Payload goes here
  alert("This is a Cross-site Scripting (XSS) attack");
</script>

By manipulating the VIEWSTATE parameter with the above payload, an attacker can deliver it to the victim's browser, which will execute the JavaScript code and potentially cause harm.

Craft a malicious URL containing the XSS payload encoded in the VIEWSTATE parameter. For example

http://vulnerable_application/ErroreNonGestito.aspx?_VIEWSTATE=[malicious_payload_here]

2. Share the crafted link with a victim or use social engineering techniques to convince them to click on it.

3. Once the victim clicks on the link, their browser will load the malicious script and execute it in their browser context.

4. Depending on the payload employed, the attacker can now carry out a wide range of malicious activities.

Mitigation Recommendations

To fix these vulnerabilities, it is necessary to update the GruppoSCAI RealGimm software to the latest version. If an update is not available, users can implement the following security measures:

Implement proper input validation and sanitization of the VIEWSTATE parameter.

- Employ Content Security Policy (CSP) headers to limit the sources from which scripts can be executed.

References

For more information on the vulnerabilities and their impact, users should consult the following resources:

1. CVE-2023-41642 - National Vulnerability Database (NVD)
2. GruppoSCAI RealGimm Product Page
3. OWASP Top Ten Project - Cross-site Scripting (XSS))

Conclusion

The existence of multiple reflected XSS vulnerabilities in GruppoSCAI RealGimm 1.1.37p38 poses a serious security risk to its users. Attackers can take advantage of these vulnerabilities to execute malicious JavaScript code within the context of the victim user's browser, leading to potentially severe consequences. To protect themselves against such exploits, users should update their software to the latest version and follow best-practice security measures, such as input validation and employing Content Security Policy headers.

Timeline

Published on: 08/31/2023 14:15:09 UTC
Last modified on: 09/06/2023 22:15:08 UTC