Description
Improper access control in Calibre 6.9.0 ~ 7.14.0 allow unauthenticated attackers to achieve remote code execution.
EPSS Score:
93%
Comprehensive Technical Analysis of EUVD-2024-47814
1. Vulnerability Assessment and Severity Evaluation
The vulnerability identified as EUVD-2024-47814 (alias CVE-2024-6782) pertains to improper access control in Calibre versions 6.9.0 through 7.14.0. This flaw allows unauthenticated attackers to achieve remote code execution (RCE). The severity of this vulnerability is rated with a CVSS Base Score of 9.8, which is considered critical. The CVSS vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H indicates the following:
- Attack Vector (AV): Network (N) - The vulnerability is exploitable over the network.
- Attack Complexity (AC): Low (L) - The attack requires minimal skill or resources.
- Privileges Required (PR): None (N) - No privileges are required to exploit the vulnerability.
- User Interaction (UI): None (N) - No user interaction is required.
- Scope (S): Unchanged (U) - The vulnerability does not change the security scope.
- Confidentiality (C): High (H) - Complete loss of confidentiality.
- Integrity (I): High (H) - Complete loss of integrity.
- Availability (A): High (H) - Complete loss of availability.
The EPSS (Exploit Prediction Scoring System) score of 93 indicates a high likelihood of exploitation in the wild.
2. Potential Attack Vectors and Exploitation Methods
Given the nature of the vulnerability, potential attack vectors include:
- Network-Based Attacks: Attackers can exploit the vulnerability over the network without needing to authenticate.
- Remote Code Execution: The primary risk is RCE, where attackers can execute arbitrary code on the affected system.
- Data Exfiltration: Attackers could potentially exfiltrate sensitive data due to the high confidentiality impact.
- Service Disruption: The high availability impact suggests that attackers could disrupt services, leading to denial-of-service (DoS) conditions.
Exploitation methods might involve:
- Crafted Network Packets: Sending specially crafted network packets to the vulnerable Calibre service.
- Malicious Input: Exploiting input validation flaws to inject malicious code.
- Automated Scripts: Using automated scripts to scan for and exploit vulnerable systems.
3. Affected Systems and Software Versions
The vulnerability affects Calibre versions from 6.9.0 to 7.14.0. Organizations and individuals using these versions are at risk. It is crucial to identify and update these systems promptly.
4. Recommended Mitigation Strategies
To mitigate the risk associated with this vulnerability, the following strategies are recommended:
- Patch Management: Immediately update to the latest version of Calibre that addresses this vulnerability.
- Network Segmentation: Isolate vulnerable systems from critical networks to limit the attack surface.
- Firewall Rules: Implement strict firewall rules to restrict access to the Calibre service.
- Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious network activity.
- Regular Audits: Conduct regular security audits and vulnerability assessments.
- User Education: Educate users about the risks and best practices for maintaining system security.
5. Impact on European Cybersecurity Landscape
The high severity and critical nature of this vulnerability pose significant risks to European organizations and individuals using Calibre. The potential for RCE and data exfiltration could lead to severe breaches, financial losses, and reputational damage. The widespread use of Calibre in various sectors, including education, research, and personal use, amplifies the impact.
6. Technical Details for Security Professionals
For security professionals, the following technical details are pertinent:
- Vulnerability Type: Improper access control leading to RCE.
- Affected Component: The specific component within Calibre that handles network requests and access control.
- Exploit Code: Review the GitHub commit (
38a1bf50d8cd22052ae59c513816706c6445d5e9) for details on the code changes that address the vulnerability. - Detection: Use network monitoring tools to detect unusual traffic patterns indicative of exploitation attempts.
- Response: Implement incident response plans to quickly identify and mitigate any successful exploitation.
Conclusion
EUVD-2024-47814 represents a critical vulnerability in Calibre that requires immediate attention. Organizations should prioritize patching and implementing robust security measures to protect against potential exploitation. The high likelihood of exploitation and severe impact underscore the urgency of addressing this vulnerability in the European cybersecurity landscape.