A vulnerability, which was classified as problematic, was found in i2p up to 2.2.x. Affected is an unknown part of the component Hidden Service Handler. The manipulation with an unknown input leads to a observable behavioral discrepancy vulnerability. CWE is classifying the issue as CWE-205. The product's behaviors indicate important differences that may be observed by unauthorized actors in a way that reveals (1) its internal state or decision process, or (2) differences from other products with equivalent functionality. This is going to have an impact on confidentiality. CVE summarizes:

i2p before 2.3.0 (Java) allows de-anonymizing the public IPv4 and IPv6 addresses of i2p hidden services (aka eepsites) via a correlation attack across the IPv4 and IPv6 addresses that occurs when a tunneled, replayed message has a behavior discrepancy (it may be dropped, or may result in a Wrong Destination response). An attack would take days to complete.

The advisory is available at xeiaso.net. This vulnerability is traded as CVE-2023-36325 since 06/21/2023. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1592 by the MITRE ATT&CK project.

Upgrading to version 2.3.0 eliminates this vulnerability.

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• i2p

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• 2.0
• 2.1
• 2.2

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