CVE-2002-2162 in Trillian
Summary
by MITRE
Cerulean Studios Trillian 0.73 and earlier use weak encrypttion (XOR) for storing user passwords in .ini files in the Trillian directory, which allows local users to gain access to other user accounts.
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Analysis
by VulDB Data Team • 05/24/2025
The vulnerability identified as CVE-2002-2162 represents a critical security flaw in Cerulean Studios Trillian version 0.73 and earlier, where the application employs weak encryption mechanisms to store user credentials. This issue falls under the category of improper credential storage as defined by CWE-256, where sensitive authentication information is not adequately protected. The vulnerability specifically manifests in the application's handling of password storage within configuration files, particularly the .ini files located in the Trillian directory. These files contain user account information that has been encrypted using a simple XOR cipher, a technique that provides minimal security protection and can be easily reversed by determined attackers.
The technical implementation of this vulnerability stems from the application's use of XOR encryption, which is fundamentally flawed for password protection purposes. XOR encryption with a fixed key or simple key derivation mechanisms creates a predictable pattern that can be exploited through basic reverse engineering techniques. When local users gain access to the Trillian directory, they can directly examine the .ini configuration files and extract the XOR-encrypted passwords. The weakness lies in the algorithm's simplicity and lack of proper cryptographic practices, making it trivial for attackers to decrypt the stored credentials without requiring advanced technical skills or significant computational resources.
The operational impact of this vulnerability extends beyond simple unauthorized access to user accounts. Local users who can read the configuration files can potentially access multiple user accounts within the same Trillian installation, leading to privilege escalation and unauthorized system access. This creates a significant risk for environments where multiple users share a single Trillian installation, as the compromise of one user's account can lead to the exposure of all stored credentials. The vulnerability also impacts the principle of least privilege, as users who should only have access to their own account information can potentially access others' accounts, undermining the security model of the application. Additionally, this weakness can facilitate further attacks such as credential reuse across different systems or services where users may have employed the same passwords.
Mitigation strategies for this vulnerability should focus on implementing proper cryptographic practices for credential storage. The most effective approach involves replacing the XOR encryption with strong encryption algorithms such as AES or bcrypt for password hashing. Organizations should ensure that password storage follows industry standards such as those recommended by NIST SP 800-63B for digital identity management. The implementation of proper key management practices, including the use of unique encryption keys per user and secure key storage mechanisms, should be enforced. System administrators should also conduct regular security audits to identify and remediate similar weak encryption implementations in other applications. Furthermore, the principle of defense in depth should be applied by implementing additional security controls such as file access permissions, regular monitoring of configuration file access, and user activity logging to detect unauthorized access attempts. This vulnerability serves as a classic example of why cryptographic implementations must be carefully reviewed and validated against established security standards rather than relying on simple obfuscation techniques that provide false security assurances.