Overview
CVE-2025-34324 describes a critical vulnerability affecting GoSign Desktop versions 2.4.0 and earlier. This flaw stems from an insecure update mechanism that relies on an unsigned update manifest. An attacker, by intercepting network traffic or manipulating local proxy settings, can exploit this weakness to execute arbitrary code on the victim’s machine.
Technical Details
GoSign Desktop uses an update manifest to distribute application updates. This manifest contains the URLs for the update packages and their corresponding SHA-256 hashes. However, crucially, this manifest lacks a digital signature. This means the authenticity of the manifest relies solely on the underlying TLS channel.
The vulnerability arises because TLS certificate validation can be disabled when a proxy is configured within the application. This allows an attacker positioned to intercept network traffic (e.g., through a man-in-the-middle attack) to inject a malicious update manifest. The attacker would then provide a corresponding malicious package that matches the SHA-256 hash specified in the tampered manifest. The client, trusting the compromised TLS connection, downloads and installs this malicious update.
Furthermore, a local attacker with the ability to modify proxy settings can leverage this vulnerability to escalate privileges. By forcing the installation of a crafted update, they can gain elevated access on the system.
CVSS Analysis
Due to the provided information, the CVSS score is currently listed as N/A. However, given the potential for Remote Code Execution (RCE) and Privilege Escalation, the vulnerability would likely receive a high or critical CVSS score upon further analysis. Factors contributing to a high score include:
- Attack Vector: Network (if exploiting via MITM) or Local (if exploiting via proxy manipulation)
- Attack Complexity: Medium (requires network interception or proxy manipulation)
- Privileges Required: None (if exploiting via MITM) or Low (if exploiting via proxy manipulation)
- User Interaction: None
- Scope: Changed (due to the potential for privilege escalation)
- Confidentiality Impact: High
- Integrity Impact: High
- Availability Impact: High
Possible Impact
Successful exploitation of CVE-2025-34324 can have severe consequences:
- Remote Code Execution (RCE): An attacker can execute arbitrary code on the victim’s machine, potentially gaining full control of the system.
- Privilege Escalation: A local attacker can escalate their privileges to gain higher-level access to the system.
- Data Theft: Attackers can steal sensitive data stored on the compromised machine.
- Malware Installation: The attacker can install malware, such as ransomware or spyware.
- System Compromise: The entire system can be compromised, leading to data loss, service disruption, and reputational damage.
Mitigation or Patch Steps
The primary mitigation is to update GoSign Desktop to a version that addresses this vulnerability. Contact InfoCert, the vendor of GoSign Desktop, for the latest version and security updates. In the interim, consider the following temporary measures:
- Disable Proxy Settings: If possible, avoid using a proxy with GoSign Desktop.
- Monitor Network Traffic: Monitor network traffic for suspicious activity, particularly during update processes.
- Implement Network Security Controls: Ensure robust network security controls are in place to prevent man-in-the-middle attacks.
- Use a VPN: Using a VPN can help protect against man-in-the-middle attacks by encrypting network traffic.
References
InfoCert GoSign Suite
USH.it: Multiple Vulnerabilities GoSign Desktop Remote Code Execution
USH.it (Italian): Vulnerabilità Multiple GoSign Desktop Esecuzione Remota Codice Arbitrario
VulnCheck Advisory: GoSign Desktop Insecure Update Mechanism RCE
