CVE-2026-27180

Comprehensive Technical Analysis of CVE-2026-27180

1. Vulnerability Assessment and Severity Evaluation

CVE ID: CVE-2026-27180 CVSS Score: 9.8

Severity Evaluation: The CVSS score of 9.8 indicates a critical vulnerability. This score is derived from the following factors:

• Attack Vector: Network (AV:N)
• Attack Complexity: Low (AC:L)
• Privileges Required: None (PR:N)
• User Interaction: None (UI:N)
• Scope: Changed (S:C)
• Confidentiality Impact: High (C:H)
• Integrity Impact: High (I:H)
• Availability Impact: High (A:H)

The vulnerability allows unauthenticated remote code execution (RCE) through supply chain compromise via update URL poisoning. This makes it highly exploitable and impactful, warranting immediate attention.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

1. Unauthenticated Access: The saverestore module exposes its admin() method without proper authentication.
2. Supply Chain Compromise: The attacker can poison the system update URL and trigger the update process to execute malicious code.
3. Weak Validation: The autoUpdateSystem() method fetches an Atom feed from an attacker-controlled URL with trivial validation.
4. TLS Verification Disabled: The use of curl with CURLOPT_SSL_VERIFYPEER set to FALSE allows for man-in-the-middle (MITM) attacks.
5. Arbitrary File Deployment: The attacker can deploy arbitrary PHP files, including webshells, to the webroot.

Exploitation Methods:

1. URL Poisoning: The attacker can manipulate the update URL to point to a malicious server.
2. Triggering Update: The attacker can trigger the force_update handler to initiate the update process.
3. Malicious Payload: The attacker can deploy a tarball containing malicious PHP files, which are then extracted and copied to the document root.

3. Affected Systems and Software Versions

Affected Systems:

• Systems running MajorDoMo (Major Domestic Module) with the saverestore module enabled.

Software Versions:

• Specific versions affected are not mentioned, but it is implied that any version with the saverestore module and the described vulnerabilities is at risk.

4. Recommended Mitigation Strategies

1. Immediate Patching: Apply the latest security patches provided by the vendor to address the vulnerability.
2. Authentication Enforcement: Ensure that all administrative endpoints require proper authentication.
3. Input Validation: Implement robust input validation to prevent unauthorized access and manipulation.
4. TLS Verification: Enable TLS verification (CURLOPT_SSL_VERIFYPEER set to TRUE) to prevent MITM attacks.
5. Secure Update Mechanisms: Implement secure update mechanisms with strong validation and verification processes.
6. Monitoring and Logging: Enhance monitoring and logging to detect and respond to suspicious activities.

5. Impact on Cybersecurity Landscape

Impact:

• Widespread Exploitation: The ease of exploitation and the critical nature of the vulnerability make it a prime target for widespread attacks.
• Supply Chain Risks: Highlights the risks associated with supply chain compromises and the importance of secure update mechanisms.
• Reputation Damage: Organizations using MajorDoMo may face significant reputational damage if exploited.
• Data Breaches: Potential for data breaches, unauthorized access, and loss of data integrity.

6. Technical Details for Security Professionals

Technical Details:

1. Vulnerable Endpoint: /objects/?module=saverestore
2. Method Exposure: The admin() method is exposed without authentication.
3. Request Handling: The method uses gr('mode') which reads directly from $_REQUEST.
4. Update URL Poisoning: The auto_update_settings mode handler can be manipulated to poison the update URL.
5. Update Trigger: The force_update handler initiates the update process.
6. Atom Feed Fetching: The autoUpdateSystem() method fetches an Atom feed from the attacker-controlled URL.
7. Tarball Download: The method downloads a tarball via curl with TLS verification disabled.
8. File Extraction: The tarball is extracted using exec('tar xzvf ...').
9. File Copying: All extracted files are copied to the document root using copyTree().

References:

• Chocapikk Blog Post
• GitHub Pull Request
• VulnCheck Advisory

Conclusion: CVE-2026-27180 represents a critical vulnerability in MajorDoMo that allows for unauthenticated remote code execution through supply chain compromise. Immediate patching, robust authentication, input validation, and secure update mechanisms are essential to mitigate this risk. The cybersecurity landscape must address supply chain vulnerabilities to prevent such high-impact exploits.