CVE-2023-50931: CSRF Vulnerability in savignano S/Notify Allows Configuration Tampering

Overview

The CVE-2023-50931 vulnerability is a sensitive issue specifically impacting users of savignano S/Notify before version 2.0.1 for Bitbucket. This vulnerability is significant due to its potential to compromise system security and lead to data leakage. An attacker exploiting this vulnerability can modify the configuration settings of the S/Notify app, particularly impacting email notifications, which could potentially go unencrypted.

Vulnerability Summary

CVE ID: CVE-2023-50931
Severity: High (8.3 CVSS Score)
Attack Vector: Network
Privileges Required: High (Administrator)
User Interaction: Required
Impact: System compromise, potential data leakage

Affected Products

Product | Affected Versions

savignano S/Notify for Bitbucket | Before 2.0.1

How the Exploit Works

The exploit leverages a Cross-Site Request Forgery (CSRF) vulnerability in the savignano S/Notify application. This attack can be initiated by tricking an administrative user into clicking a malicious link in an email or navigating to a malicious website. If executed while an administrator is logged onto Bitbucket, the attacker could manipulate the configuration settings of the S/Notify app on that host, leading to potential system compromise or data leakage.

Conceptual Example Code

The following is a conceptual example of how the CSRF exploit might be initiated. The code snippet below represents an HTTP request that carries the malicious CSRF payload.

GET /malicious/link HTTP/1.1
Host: attacker.example.com
Content-Type: application/json
{ "csrf_payload": "modify_snotify_settings" }

This payload would, in theory, trigger a request to modify the S/Notify settings on the victim’s Bitbucket instance when clicked by an admin user. This is a simplified representation and actual exploits may involve more complex payloads and techniques.

Mitigation

To mitigate this vulnerability, apply the vendor patch immediately. If unable to update promptly, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary protection by detecting and blocking malicious traffic. Regularly updating and patching software, along with user education on the dangers of clicking unverified links, can also help prevent these types of vulnerabilities.