Description
In modem, there is a possible system crash due to improper input validation. This could lead to remote escalation of privilege with no additional execution privileges needed.
EPSS Score:
0%
Comprehensive Technical Analysis of EUVD-2025-33802
1. Vulnerability Assessment and Severity Evaluation
The vulnerability EUVD-2025-33802, also known as CVE-2025-31718, is a critical issue affecting certain modem models manufactured by Unisoc. The vulnerability arises from improper input validation, which can lead to a system crash and potential remote escalation of privilege without requiring additional execution privileges.
Severity Evaluation:
- Base Score: 9.8 (Critical)
- Base Score Version: CVSS 3.1
- Base Score Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
The CVSS score of 9.8 indicates a highly critical vulnerability. The vector string details the following:
- Attack Vector (AV): Network (N)
- Attack Complexity (AC): Low (L)
- Privileges Required (PR): None (N)
- User Interaction (UI): None (N)
- Scope (S): Unchanged (U)
- Confidentiality (C): High (H)
- Integrity (I): High (H)
- Availability (A): High (H)
This score reflects the severe impact on confidentiality, integrity, and availability, making it a high-priority issue for immediate remediation.
2. Potential Attack Vectors and Exploitation Methods
Attack Vectors:
- Network-Based Attacks: Given the attack vector is network-based, an attacker can exploit this vulnerability remotely over the internet.
- Input Validation Flaws: The primary attack vector involves sending malformed input to the modem, which can cause a system crash and potentially lead to privilege escalation.
Exploitation Methods:
- Crafted Packets: An attacker could send specially crafted packets to the modem, exploiting the improper input validation.
- Remote Code Execution: If the attacker can crash the system and escalate privileges, they might be able to execute arbitrary code remotely.
3. Affected Systems and Software Versions
Affected Models:
- T606, T612, T616, T750, T765, T760, T770, T820, S8000, T8300, T9300
Affected Software Versions:
- Android 13, Android 14, Android 15, Android 16
These models and software versions are particularly vulnerable and should be prioritized for patching and mitigation efforts.
4. Recommended Mitigation Strategies
Immediate Actions:
- Patch Management: Apply the latest firmware updates provided by Unisoc as soon as they are available.
- Network Segmentation: Isolate affected modems from critical networks to limit the potential impact of an attack.
- Input Filtering: Implement strict input validation and filtering mechanisms to prevent malformed packets from reaching the modem.
Long-Term Strategies:
- Regular Audits: Conduct regular security audits and vulnerability assessments to identify and mitigate similar issues.
- Security Training: Educate IT staff on the importance of input validation and secure coding practices.
- Intrusion Detection Systems (IDS): Deploy IDS to monitor network traffic for suspicious activities that could indicate an exploitation attempt.
5. Impact on European Cybersecurity Landscape
The vulnerability poses a significant risk to European organizations and individuals using the affected modems. Given the widespread use of these devices, a successful exploitation could lead to:
- Data Breaches: Compromise of sensitive information.
- Service Disruptions: Interruption of critical services relying on these modems.
- Economic Impact: Financial losses due to downtime and recovery efforts.
Regulatory Compliance:
- Organizations must ensure compliance with GDPR and other relevant regulations to protect user data and maintain trust.
6. Technical Details for Security Professionals
Technical Overview:
- Input Validation: The core issue is improper input validation, which can be exploited by sending malformed data to the modem.
- System Crash: The vulnerability can cause the modem to crash, leading to a denial of service (DoS) condition.
- Privilege Escalation: The crash can be leveraged to escalate privileges, potentially allowing remote code execution.
Detection and Response:
- Log Analysis: Monitor logs for unusual patterns or errors that could indicate an exploitation attempt.
- Behavioral Analysis: Use behavioral analysis tools to detect anomalous behavior that might suggest a compromise.
- Incident Response Plan: Develop and maintain an incident response plan tailored to this vulnerability, including steps for containment, eradication, and recovery.
References:
By addressing this vulnerability promptly and comprehensively, organizations can mitigate the risk of exploitation and protect their systems and data from potential attacks.