| Description |
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A security issue has been found in Tor before version 0.4.6.5 that could be exploited for a hashtable-based CPU denial-of-service attack against relays. Previously a naive unkeyed hash function to look up circuits in a circuitmux object was used. An attacker could exploit this to construct circuits with chosen circuit IDs, to create collisions and make the hash table inefficient. Now a SipHash construction is used instead. |
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A security issue has been found in Tor before version 0.4.5.9 that could be exploited for a hashtable-based CPU denial-of-service attack against relays. Previously a naive unkeyed hash function to look up circuits in a circuitmux object was used. An attacker could exploit this to construct circuits with chosen circuit IDs, to create collisions and make the hash table inefficient. Now a SipHash construction is used instead. |
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