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TLS: detect abnormal padding usage (#2579)

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Padding is usually some hundreds byte long. Longer padding might be used
as obfuscation technique to force unusual CH fragmentation
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Ivan Nardi 2024-10-01 17:15:03 +02:00 • committed by GitHub
parent 8972b74fd0
commit 623b7e236f
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4 changed files with 48 additions and 1 deletions
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32
tests/cfgs/default/result/tls_with_huge_ch.pcapng.out Normal file
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@ -0,0 +1,32 @@
DPI Packets (TCP): 32 (32.00 pkts/flow)
Confidence DPI : 1 (flows)
Num dissector calls: 284 (284.00 diss/flow)
LRU cache ookla: 0/0/0 (insert/search/found)
LRU cache bittorrent: 0/3/0 (insert/search/found)
LRU cache stun: 0/0/0 (insert/search/found)
LRU cache tls_cert: 0/1/0 (insert/search/found)
LRU cache mining: 0/0/0 (insert/search/found)
LRU cache msteams: 0/0/0 (insert/search/found)
LRU cache fpc_dns: 0/1/0 (insert/search/found)
Automa host: 0/0 (search/found)
Automa domain: 0/0 (search/found)
Automa tls cert: 0/0 (search/found)
Automa risk mask: 0/0 (search/found)
Automa common alpns: 2/2 (search/found)
Patricia risk mask: 2/0 (search/found)
Patricia risk mask IPv6: 0/0 (search/found)
Patricia risk: 0/0 (search/found)
Patricia risk IPv6: 0/0 (search/found)
Patricia protocols: 2/0 (search/found)
Patricia protocols IPv6: 0/0 (search/found)
TLS 428 119100 1
Safe 428 119100 1
JA3 Host Stats:
IP Address # JA3C
1 172.30.84.193 1
1 TCP 172.30.84.193:40640 <-> 208.253.217.142:443 [proto: 91/TLS][IP: 0/Unknown][Encrypted][Confidence: DPI][FPC: 0/Unknown, Confidence: Unknown][DPI packets: 32][cat: Web/5][194 pkts/51762 bytes <-> 234 pkts/67338 bytes][Goodput ratio: 75/77][31.67 sec][(Advertised) ALPNs: h2;http/1.1][TLS Supported Versions: TLSv1.3;TLSv1.2;TLSv1.1;TLSv1][bytes ratio: -0.131 (Mixed)][IAT c2s/s2c min/avg/max/stddev: 0/0 135/123 2012/2189 352/307][Pkt Len c2s/s2c min/avg/max/stddev: 66/66 267/288 1090/1514 287/409][Risk: ** Missing SNI TLS Extn **** ALPN/SNI Mismatch **** Obfuscated Traffic **][Risk Score: 200][Risk Info: Abnormal Client Hello/Padding length / SNI should always be present / h2][TLSv1.2][JA3C: 66d6080b942b0b593896bf729f3fd326][JA4: t13d1811h2_f71e3e15ae0d_5c3a8cf9b2bc][Firefox][Plen Bins: 0,0,7,52,4,3,7,1,2,0,2,0,1,0,0,1,0,0,0,1,0,0,0,0,0,0,0,0,1,0,0,0,10,0,0,1,0,0,0,0,0,0,1,0,0,1,0,0]