CVE-2025-1699

Executive Summary

CVE-2025-1699 is a vulnerability in the MotoSignature application, reported as an incorrect default permissions issue. This flaw could allow unauthorized access to the application's resources or data. The vulnerability has a CVSS score of 0.0, indicating incomplete scoring data, but the nature of the flaw (incorrect default permissions) typically leads to privilege escalation or information disclosure. No public exploit code or proof-of-concept is available at this time, and the vendor has not released a patch. The EPSS score is 0.0%, suggesting low exploitation activity in the wild, but the risk remains due to the potential for unauthorized access.

Supply Chain & Package Security

This vulnerability is not related to NPM, PyPI, Go, or Ruby ecosystems. It is a standalone application (MotoSignature) with no known package dependencies.

CVSS Breakdown & Threat Level

The CVSS score is listed as 0.0, which is unusual and likely indicates incomplete or missing vector data. Based on the description ("incorrect default permissions"), the vulnerability would typically be classified under CWE-276 (Incorrect Default Permissions). The threat level is considered Medium due to the potential for unauthorized access, but without a CVSS vector, precise severity cannot be determined.

Deep Dive & Mechanics

The vulnerability stems from the MotoSignature application setting incorrect default permissions on files, directories, or system resources. This could allow a local or remote attacker to access sensitive data, modify application behavior, or escalate privileges. The exact attack vector is unclear, but common scenarios include:

• World-readable configuration files containing credentials.
• Weak file permissions allowing unauthorized modification of application binaries.
• Insecure default ACLs on shared resources.

The lack of a patch and public exploit suggests the vulnerability may be in an older or less-maintained version of the software.

Vulnerable vs. Patched Code

No specific code snippets are available. The vulnerability is in the default permissions configuration of the MotoSignature application. A patched version would enforce least-privilege permissions, such as:

• Restricting file access to the application user only.
• Using secure defaults (e.g., 0600 for sensitive files).
• Implementing proper access control lists (ACLs).

Exploitation & Lab Setup

Red Team

Since no public exploit exists, a red team would need to:

1. Identify the MotoSignature application version and installation path.
2. Check file permissions on key files (e.g., /etc/motosignature/config.ini, /usr/local/motosignature/*).
3. Attempt to read or modify files with weak permissions.
4. Escalate privileges if possible.

Example command to check permissions:

ls -la /usr/local/motosignature/

Blue Team

Blue team should:

1. Audit file permissions on all MotoSignature-related files.
2. Monitor for unauthorized access attempts to sensitive files.
3. Implement file integrity monitoring (FIM) for critical directories.

Indicators of Compromise (IOCs)

• Unauthorized access to MotoSignature configuration files.
• Unexpected changes to application binaries or scripts.
• Anomalous process execution under the MotoSignature user context.

Detection Engineering

YARA Rule

rule CVE_2025_1699_MotoSignature_Permissions {
    meta:
        description = "Detects incorrect default permissions in MotoSignature files"
        author = "Valters IT"
        date = "2025-01-01"
        reference = "CVE-2025-1699"
    strings:
        $s1 = "MotoSignature" nocase
        $s2 = "config.ini" nocase
        $s3 = "permissions" nocase
    condition:
        any of ($s*) and filesize < 10MB
}

Sigma Rule

title: CVE-2025-1699 - MotoSignature Incorrect Default Permissions
id: cve-2025-1699
status: experimental
description: Detects attempts to exploit incorrect default permissions in MotoSignature
author: Valters IT
logsource:
    category: file_event
    product: linux
detection:
    selection:
        TargetFilename|contains: '/usr/local/motosignature/'
        EventID: 11  # File creation or modification
    condition: selection
falsepositives:
    - Legitimate updates to MotoSignature
level: medium

Suricata Rule

alert tcp any any -> any any (msg:"CVE-2025-1699 MotoSignature Unauthorized Access Attempt"; flow:to_server; content:"MotoSignature"; nocase; content:"config"; nocase; sid:1000001; rev:1;)

Remediation & Mitigation

1. Immediate Actions:

   • Manually review and correct file permissions on all MotoSignature files.
   • Restrict access to the application directory to only the necessary user/group.
   • Implement a file integrity monitoring solution.

2. Long-term Fix:

   • Contact the vendor for a patch or update.
   • If no patch is available, consider replacing the application with a more secure alternative.

3. Detection:

   • Deploy the provided YARA, Sigma, and Suricata rules.
   • Monitor logs for unauthorized access attempts.

Valters IT
DevSecOps & Cyber Threat Intelligence