UpSignOn for Windows Sensitive Data Exposure via Process Memory

Executive Summary

UpSignOn for Windows before 7.19.0 has a vulnerability where a backup key remains in the process memory of UpSignOn.exe even after the vault is re-locked. Attackers can extract this backup key to decrypt the encrypted master password backup stored in a file named v6-vault1.DATA.txt. The recovered master password can then be used to decrypt the main vault and export all password manager entries in plaintext.

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Detection Guidance

To detect this vulnerability, monitor for suspicious process memory access or unusual file reads targeting UpSignOn.exe or v6-vault1.DATA.txt. Check for unauthorized decryption attempts or plaintext password exports. Use tools like Process Explorer or WinDbg to inspect memory contents of UpSignOn.exe for retained backup keys.

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Impact Analysis

If you use UpSignOn for Windows versions before 7.19.0, a local attacker with low privileges could recover your master password and decrypt all stored passwords. This could lead to unauthorized access to sensitive information, identity theft, or data breaches.

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Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR's data protection requirements and HIPAA's safeguards for protected health information. Organizations using affected versions may face compliance violations, legal penalties, and reputational damage.

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Mitigation Strategies

Immediately upgrade UpSignOn for Windows to version 7.19.0 or later to patch the vulnerability. If upgrading is not possible, restrict local user access to systems running UpSignOn and monitor for unauthorized memory access. Avoid storing sensitive data in plaintext and review system logs for suspicious activity.

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