Description
pyLoad is the free and open-source Download Manager written in pure Python. In versions 0.5.0b3.dev89 and below, there is an opportunity for path traversal in pyLoad-ng CNL Blueprint via package parameter, allowing Arbitrary File Write which leads to Remote Code Execution (RCE). The addcrypted endpoint in pyload-ng suffers from an unsafe path construction vulnerability, allowing unauthenticated attackers to write arbitrary files outside the designated storage directory. This can be abused to overwrite critical system files, including cron jobs and systemd services, leading to privilege escalation and remote code execution as root. This issue is fixed in version 0.5.0b3.dev90.
EPSS Score:
0%
Comprehensive Technical Analysis of EUVD-2025-23574
1. Vulnerability Assessment and Severity Evaluation
The vulnerability described in EUVD-2025-23574 affects pyLoad, an open-source download manager written in Python. The issue pertains to a path traversal vulnerability in the pyLoad-ng CNL Blueprint via the package parameter, which allows for Arbitrary File Write. This can lead to Remote Code Execution (RCE) due to unsafe path construction in the addcrypted endpoint.
Severity Evaluation:
- CVSS Base Score: 9.8 (Critical)
- CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
The high CVSS score indicates a critical vulnerability due to the following factors:
- 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 vulnerability can be exploited remotely without any user interaction, making it highly dangerous.
2. Potential Attack Vectors and Exploitation Methods
Attack Vectors:
- Path Traversal: An attacker can manipulate the package parameter to traverse directories and write arbitrary files outside the designated storage directory.
- Arbitrary File Write: By exploiting the path traversal vulnerability, an attacker can overwrite critical system files, including cron jobs and systemd services.
Exploitation Methods:
- Unauthenticated Access: The
addcryptedendpoint does not require authentication, allowing unauthenticated attackers to exploit the vulnerability. - Privilege Escalation: By overwriting system files, an attacker can gain elevated privileges, potentially leading to root access.
- Remote Code Execution: Once elevated privileges are obtained, an attacker can execute arbitrary code on the compromised system.
3. Affected Systems and Software Versions
Affected Software:
- pyLoad versions 0.5.0b3.dev89 and below.
Fixed Version:
- The issue is resolved in version 0.5.0b3.dev90.
4. Recommended Mitigation Strategies
Immediate Actions:
- Upgrade: Immediately upgrade to pyLoad version 0.5.0b3.dev90 or later.
- Patch Management: Ensure that all systems running pyLoad are part of a regular patch management cycle.
Long-Term Strategies:
- Access Control: Implement strict access controls to limit exposure of the
addcryptedendpoint. - Monitoring: Deploy monitoring tools to detect and alert on suspicious file write activities.
- Network Segmentation: Segment networks to limit the lateral movement of attackers.
- Security Audits: Conduct regular security audits and code reviews to identify and mitigate similar vulnerabilities.
5. Impact on European Cybersecurity Landscape
The vulnerability poses a significant risk to organizations and individuals using pyLoad within the European Union. Given the critical nature of the vulnerability, it could be exploited to compromise sensitive data, disrupt services, and gain unauthorized access to systems. This underscores the importance of timely patching and robust cybersecurity practices to protect against such threats.
6. Technical Details for Security Professionals
Vulnerability Details:
- Path Traversal: The vulnerability arises from improper validation of the package parameter, allowing directory traversal.
- Unsafe Path Construction: The
addcryptedendpoint constructs file paths unsafely, leading to the ability to write files outside the intended directory.
Exploitation Steps:
- Identify Target: Locate a system running a vulnerable version of pyLoad.
- Craft Payload: Create a payload that exploits the path traversal vulnerability to write to a critical system file.
- Execute Attack: Send the crafted payload to the
addcryptedendpoint. - Gain Control: Overwrite system files to gain elevated privileges and execute arbitrary code.
References:
Conclusion: The vulnerability in pyLoad is critical and requires immediate attention. Organizations should prioritize upgrading to the patched version and implement robust security measures to mitigate similar risks in the future.