CVE-2025-49113

Comprehensive Technical Analysis of CVE-2025-49113

1. Vulnerability Assessment and Severity Evaluation

CVE ID: CVE-2025-49113 CVSS Score: 9.9

The vulnerability in Roundcube Webmail, identified as CVE-2025-49113, is classified as a remote code execution (RCE) vulnerability. The high CVSS score of 9.9 indicates that this vulnerability is critical. The severity is due to the potential for authenticated users to execute arbitrary code on the server, which can lead to complete system compromise.

2. Potential Attack Vectors and Exploitation Methods

The vulnerability arises from insufficient validation of the _from parameter in a URL within the program/actions/settings/upload.php script. This lack of validation can lead to PHP Object Deserialization, a known attack vector that can be exploited to execute arbitrary code.

Exploitation Methods:

• Authenticated User Access: An attacker with valid credentials can craft a malicious URL containing a specially crafted _from parameter.
• PHP Object Deserialization: The deserialization process can be manipulated to inject malicious code, leading to RCE.

3. Affected Systems and Software Versions

Affected Versions:

• Roundcube Webmail before 1.5.10
• Roundcube Webmail 1.6.x before 1.6.11

Unaffected Versions:

• Roundcube Webmail 1.5.10 and later
• Roundcube Webmail 1.6.11 and later

4. Recommended Mitigation Strategies

Immediate Actions:

• Update Software: Upgrade to the latest patched versions (1.5.10 or 1.6.11) to mitigate the vulnerability.
• Access Control: Restrict access to the Roundcube Webmail interface to trusted users only.
• Monitoring: Implement monitoring and logging to detect any unusual activity related to the upload.php script.

Long-Term Strategies:

• Regular Patching: Ensure that all software, including Roundcube Webmail, is regularly updated to the latest versions.
• Code Review: Conduct thorough code reviews to identify and fix similar vulnerabilities in other parts of the application.
• Security Training: Educate developers and administrators on secure coding practices and the risks associated with deserialization.

5. Impact on Cybersecurity Landscape

The discovery of CVE-2025-49113 highlights the ongoing challenge of securing web applications against RCE vulnerabilities. This type of vulnerability can have severe consequences, including data breaches, system compromise, and potential lateral movement within an organization's network. It underscores the importance of robust input validation, secure coding practices, and timely patch management.

6. Technical Details for Security Professionals

Vulnerability Details:

• Location: program/actions/settings/upload.php
• Parameter: _from
• Issue: Lack of validation leading to PHP Object Deserialization

Exploitation Steps:

1. Authentication: Obtain valid credentials for the Roundcube Webmail interface.
2. Craft Malicious URL: Create a URL with a specially crafted _from parameter designed to trigger deserialization.
3. Execute Code: Upon deserialization, the injected code is executed, allowing the attacker to perform arbitrary actions on the server.

Detection and Response:

• Log Analysis: Review logs for unusual activity related to the upload.php script.
• Intrusion Detection Systems (IDS): Implement IDS rules to detect and alert on suspicious deserialization attempts.
• Incident Response: Have a prepared incident response plan to quickly address any detected exploitation attempts.

References:

• Roundcube Research
• GitHub Commit 0376f69e958a8fef7f6f09e352c541b4e7729c4d
• GitHub Commit 7408f31379666124a39f9cb1018f62bc5e2dc695
• GitHub Commit c50a07d88ca38f018a0f4a0b008e9a1deb32637e
• GitHub Pull Request 9865
• Roundcube Release 1.5.10
• Roundcube Release 1.6.11
• Roundcube Security Updates
• Vicarius Mitigation Script
• Vicarius Vulnerability Detection
• Openwall OSS Security List
• Debian LTS Announcement

This comprehensive analysis provides a clear understanding of the vulnerability, its impact, and the necessary steps to mitigate the risk. It is essential for cybersecurity professionals to stay vigilant and proactive in addressing such critical vulnerabilities.