CVE-2007-4961 in Second Life
Summary
by MITRE
The login_to_simulator method in Linden Lab Second Life, as used by the secondlife:// protocol handler and possibly other Second Life login mechanisms, sends an MD5 hash in cleartext in the passwd field, which allows remote attackers to login to an account by sniffing the network and then sending this hash to a Second Life authentication server.
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Analysis
by VulDB Data Team • 10/30/2017
The vulnerability identified as CVE-2007-4961 represents a critical security flaw in Linden Lab's Second Life platform that fundamentally compromises user authentication mechanisms. This weakness resides within the login_to_simulator method which handles the authentication process for the virtual world environment. The vulnerability specifically affects the secondlife:// protocol handler and potentially other login mechanisms employed by the Second Life client, creating a persistent security risk for all users of the platform. The flaw manifests as a cryptographic weakness that violates fundamental security principles by transmitting sensitive authentication data in an unencrypted format.
The technical implementation of this vulnerability stems from the improper handling of password authentication data within the Second Life protocol stack. When users attempt to log into the Second Life environment, the system sends an MD5 hash of the user's password in cleartext format over the network. This represents a severe violation of security best practices and aligns with CWE-312, which addresses the exposure of sensitive information through cleartext transmission. The MD5 hash, while intended to provide some level of obfuscation, becomes completely ineffective when transmitted without encryption, as network sniffing tools can easily capture and reuse this information. The flaw demonstrates poor security architecture where even hashed credentials are transmitted in plaintext, eliminating any cryptographic protection that might otherwise be provided by the hashing mechanism itself.
The operational impact of this vulnerability extends far beyond simple credential theft, creating a comprehensive security breach that allows remote attackers to gain unauthorized access to user accounts. Network sniffing attacks can easily capture the cleartext MD5 hash transmitted during the login process, enabling attackers to authenticate as legitimate users without possessing the original password. This creates a scenario where attackers can impersonate users and potentially access their virtual assets, personal information, and account privileges within the Second Life environment. The vulnerability also aligns with ATT&CK technique T1075, which describes the use of legitimate credentials for unauthorized access, as attackers can leverage the captured hashes to gain persistent access to user accounts. The implications are particularly severe in a virtual environment where users may store valuable virtual property and personal data within their accounts.
The remediation of this vulnerability requires immediate implementation of secure authentication protocols that properly encrypt all authentication data during transmission. Organizations should implement TLS/SSL encryption for all network communications related to authentication, ensuring that even if network traffic is intercepted, the sensitive data remains protected. The fix should involve modifying the login_to_simulator method to transmit credentials using encrypted channels and implementing proper cryptographic protocols for authentication rather than relying on cleartext transmission of hashed values. This vulnerability serves as a prime example of why security by obscurity should never be relied upon and why proper encryption protocols must be implemented at the network protocol level rather than attempting to secure data through weak cryptographic measures alone. Additionally, the implementation of multi-factor authentication and secure credential storage practices would provide additional layers of protection against similar vulnerabilities in the future.