CVE-2025-55013 is a medium severity vulnerability affecting the Assemblyline 4 Service Client. This vulnerability allows a malicious or compromised server to exploit a path traversal issue due to improper handling of SHA-256 values returned by the service server. Versions below 4.6.1.dev138 are susceptible to this risk, making it imperative for organizations using these versions to take immediate action.
The vulnerability's severity score is 4.2 according to CVSS 3.1, classified as medium. This score indicates a notable risk to organizations that rely on the affected software. The potential exploit could lead to arbitrary file writing, compromising sensitive files on disk. Therefore, organizations should prioritize patching immediately.
The exploitation status indicates no known public exploits currently exist, and this vulnerability is not actively exploited in the wild. However, the potential for exploitation remains, particularly in environments where trust in the service server cannot be guaranteed.
Organizations should remain vigilant and monitor their systems for any signs of unusual activity, ensuring that they apply the necessary updates to mitigate this vulnerability.
Vulnerability Details
The Assemblyline 4 Service Client interfaces with the API to fetch tasks and publish results for a service in Assemblyline 4. The specific vulnerability allows the client to accept a SHA-256 value from the service server and use it directly as a local file name. If the server is malicious or compromised, it can return a path-traversal payload, potentially allowing the client to write downloaded bytes to arbitrary locations on disk. This issue has been addressed in version 4.6.1.dev138.
The vulnerability is classified under CWE-23, which refers to path traversal vulnerabilities. This type of weakness can result in unauthorized access to files outside the intended directory structure.
The CVSS score of 4.2 indicates a medium severity level, with a high attack complexity and no privileges required for exploitation. The attack vector is classified as adjacent network, meaning that an attacker needs to be on the same network segment as the vulnerable client.
Technical Analysis
The root cause of this vulnerability lies in the Assemblyline 4 Service Client's handling of SHA-256 values. When the client receives a SHA-256 value from the service, it directly uses it as a local file name without proper validation or sanitization. This oversight enables potential attackers to exploit the functionality to perform path traversal attacks.
The attack vector is adjacent network, which means that an attacker must be on the same network as the client to successfully exploit this vulnerability. The complexity of the attack is rated as high, indicating that it may require sophisticated techniques to execute.
No user interaction is required for the exploitation of this vulnerability, as it can be triggered automatically through the client's interaction with the service server. The confidentiality impact is rated as none, while the integrity and availability impacts are rated as low, suggesting that while unauthorized file access may occur, it is limited in scope.
Risk & Impact Analysis
Risk to organizations includes the potential for unauthorized access to critical files, which could lead to further exploits or data breaches if sensitive files are compromised. The ability for an attacker to write to arbitrary locations on disk carries significant implications, particularly in environments where sensitive data is stored.
Organizations must recognize the urgency of this vulnerability, especially those using affected versions. Given the potential for exploitation, it is crucial to address this vulnerability in the next patch cycle. Organizations should prioritize the patching process to mitigate risks effectively.
The overall blast radius of this vulnerability can be significant if left unremediated, particularly in a multi-tenant environment where multiple services interact. The potential for a compromised server to affect multiple clients increases the risk profile dramatically.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions prior to 4.6.1.dev138 are affected by this vulnerability. Organizations should ensure they are using the patched version to mitigate the risk associated with this issue.
Mitigation & Remediation
Organizations should prioritize applying the latest updates to the Assemblyline 4 Service Client, specifically upgrading to version 4.6.1.dev138 or later. This patch addresses the path traversal vulnerability effectively.
In case a patch is unavailable, organizations should consider implementing network controls to restrict access to the Assemblyline service, ensuring that only trusted servers can communicate with the client.
Configuration hardening should also be undertaken to minimize the risk of exploitation. Regular monitoring of logs for unusual activity can help detect any attempts to exploit this vulnerability.
Organizations should consider regular penetration testing to validate the effectiveness of their remediation efforts.
Detection Guidance
To detect potential exploitation of this vulnerability, organizations should monitor application logs for any unexpected file write operations. Look for any anomalies in the file system that may indicate unauthorized access.
Behavioral anomalies in the client-server interactions may also serve as indicators of compromise. Implementing network signatures to alert on unusual traffic patterns can help detect potential exploitation attempts.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2025-55013 lies in the ongoing challenge of path traversal vulnerabilities in application design. This incident highlights the necessity for rigorous input validation and the importance of securing communication channels between clients and servers.
Organizations should leverage this case as a learning opportunity to bolster their security posture against similar vulnerabilities. Regular security audits and adopting secure coding practices can significantly reduce the risk of such vulnerabilities reappearing.
Establishing a robust vulnerability management program is essential for identifying and remediating vulnerabilities in a timely manner.
Furthermore, understanding penetration testing methodologies can enhance an organization's ability to detect and mitigate vulnerabilities proactively.
Adopting API security best practices will also help in fortifying defenses against similar vulnerabilities.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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