CVE-2010-0383 in Tor
Summary
by MITRE
Tor before 0.2.1.22, and 0.2.2.x before 0.2.2.7-alpha, uses deprecated identity keys for certain directory authorities, which makes it easier for man-in-the-middle attackers to compromise the anonymity of traffic sources and destinations.
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Analysis
by VulDB Data Team • 04/29/2026
The vulnerability described in CVE-2010-0383 affects the Tor anonymity network and represents a critical flaw in the directory authority system that underpins Tor's distributed infrastructure. This issue specifically targets versions of Tor software prior to 0.2.1.22 and 0.2.2.7-alpha, where the software continues to utilize deprecated identity keys for certain directory authorities. The use of these outdated cryptographic keys creates a significant security weakness that undermines the fundamental anonymity guarantees that Tor provides to its users.
The technical flaw stems from the improper handling of identity keys within Tor's directory authority mechanism, which is crucial for maintaining the integrity and authenticity of the network's distributed directory services. When deprecated identity keys are used, they may have weaker cryptographic properties or have been compromised through previous security incidents. This weakness allows attackers to potentially impersonate legitimate directory authorities within the Tor network, creating opportunities for man-in-the-middle attacks that can intercept and manipulate traffic flowing through the anonymity network.
The operational impact of this vulnerability extends beyond simple traffic interception, as it fundamentally compromises the anonymity of both traffic sources and destinations within the Tor network. Attackers who successfully exploit this vulnerability can potentially correlate traffic patterns and identify users who are accessing the network, thereby breaking the anonymity guarantees that Tor is designed to provide. This represents a serious degradation of the security model that Tor users rely upon for protecting their privacy and freedom of expression online. The vulnerability affects not just individual users but the entire Tor ecosystem, as compromised directory authorities can potentially influence the routing decisions of other network participants.
From a cybersecurity perspective, this vulnerability aligns with CWE-310, which deals with Cryptographic Issues, and represents a specific instance of weak cryptographic key management within a critical infrastructure component. The attack vector described in the vulnerability maps to ATT&CK technique T1566, specifically the use of credential harvesting and network infiltration methods that target infrastructure components to undermine security controls. The remediation approach requires immediate software updates to versions that properly handle identity keys and implement secure key rotation mechanisms. Organizations and users should prioritize upgrading to the patched versions of Tor software and implementing additional monitoring for suspicious directory authority behavior. The vulnerability also highlights the importance of proper key lifecycle management in distributed systems and demonstrates how seemingly minor cryptographic issues can have significant implications for privacy and security in anonymity networks.
This vulnerability underscores the critical importance of maintaining up-to-date cryptographic infrastructure in privacy-focused systems and demonstrates how deprecated cryptographic elements can create persistent security risks that may remain undetected for extended periods. The impact extends beyond immediate security concerns to encompass broader implications for digital rights and privacy protections that Tor users depend upon for accessing information freely and securely.