Suricata IDS 3.2.12 IPv4 evasion

Credit: Jeremy BEAUME
Risk: Medium
Local: No
Remote: Yes

ere are the details of the (patched) IPv4 evasion I found in Suricata IDS/IPS: # Software Suricata IDS/IPS website : editor : Open Information Security Foundation (OISF) # Impacted version 3.2.x before 3.1.3 and before All execution mode are impacted : nfqueue, af-packet, ... # Vulnerability description Suricata did not used the IP protocol field value to identify fragments from a same packet, whereas the RFC 791 states that 2 fragments should be defragmented together only if the protocol field have the same value. This flaw makes it possible to craft a packet that will only be defragmented by Suricata (and not the destination host), leading to a packet injection in the IDS detection engine. # Impact on security An attacker can fully evade any TCP signature, without any logs / alerts. # Resources and links : New patched Suricata versions : Bug tracker and patch commit : # Thanks and note I'd like to give a special thanks to the suricata development team and especially Victor Julien : I contacted him concerning the issue, got an answer the same day, and it was corrected on github 2 working days after. Really impressive guys. If anyone needs more information about this, feel free to contact me at jeremy [dot] beaume (a) protonmail [dot] com Cheers ! Jeremy BEAUME


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