Overview
In this blog post, we will be delving into the technical details of the security vulnerability CVE-2023-50930. The vulnerability has been identified in savignano S/Notify versions before 4.0.2 for Jira. This vulnerability can have serious implications for organizations using the affected versions, potentially leading to system compromise or data leakage, and therefore it is crucial to understand its intricacies.
S/Notify is a widely used add-on for Jira, providing enhanced email notification features. As such, the vulnerability has a broad potential impact, affecting a large number of Jira installations. The severity of this vulnerability is underscored by its high CVSS score of 8.3, indicating a significant risk that requires immediate attention and mitigation.
Vulnerability Summary
CVE ID: CVE-2023-50930
Severity: High (8.3)
Attack Vector: Network (Cross-Site Request Forgery)
Privileges Required: Low (Attacker requires victim to be logged in as an administrator)
User Interaction: Required (Administrator needs to click a malicious link)
Impact: System compromise; data leakage due to changes in email notification encryption settings
Affected Products
No phone number, email, or personal info required.
Product | Affected Versions
savignano S/Notify for Jira | Before 4.0.2
How the Exploit Works
The vulnerability resides in the way S/Notify handles user requests. It fails to properly validate requests, allowing a Cross-Site Request Forgery (CSRF) attack. If an administrator clicks a maliciously crafted link while logged into Jira, the attacker can force the administrator’s browser to send a forged HTTP request to the Jira server. This request can lead to changes in the S/Notify configuration settings. In this case, the vulnerability could be exploited to disable the encryption of email notifications, potentially leading to data leakage.
Conceptual Example Code
Here is a simplified example of how the CSRF attack could be executed:
<html>
<body>
<form action="http://jira.example.com/plugins/servlet/snotify/config" method="POST">
<input type="hidden" name="emailEncryption" value="false" />
<input type="submit" value="Click me" />
</form>
</body>
</html>In this example, the attacker creates an HTML form that when submitted, sends a POST request to the S/Notify configuration endpoint on the Jira server. The `emailEncryption` parameter is set to false, requesting the server to disable email encryption.
Please note, this is a simplified, conceptual example and actual attacks would likely involve more complex code and obfuscation techniques to avoid detection.
Mitigation Guidance
The primary mitigation for this vulnerability is to apply the vendor’s patch. Savignano has released version 4.0.2 of S/Notify for Jira, which addresses this issue.
As a temporary measure, organizations can also deploy a Web Application Firewall (WAF) or Intrusion Detection System (IDS) to detect and block CSRF attacks. However, this should not be considered a long-term solution, and patching the software should be prioritized.