Unusual Payment Path xrpld 3.3

[donovanhide]

xrpld -q tx 10160F06FECBCD1014E1274E5396522D6FD9C5B8B666ABDFC42BAD9AE8003331
{
   "result" : {
      "Account" : "rMVyA5ELV2TvPbkVcEXn2JsjS8MWh7ye67",
      "Amount" : "2148336",
      "DeliverMax" : "2148336",
      "Destination" : "rMVyA5ELV2TvPbkVcEXn2JsjS8MWh7ye67",
      "Fee" : "20",
      "LastLedgerSequence" : 106785486,
      "Paths" : [
         [
            {
               "account" : "rnrnAWQtbKZQyp9waHnsPNkWVNAQdSBB23",
               "type" : 1
            },
            {
               "currency" : "XRP",
               "type" : 16
            },
            {
               "currency" : "536B657463680000000000000000000000000000",
               "issuer" : "rKqoG3EJLokTMVEjyFMmTaz9DX2cgJFaLu",
               "type" : 48
            }
         ]
      ],
      "SendMax" : {
         "currency" : "536B657463680000000000000000000000000000",
         "issuer" : "rKqoG3EJLokTMVEjyFMmTaz9DX2cgJFaLu",
         "value" : "2148682"
      },
      "Sequence" : 105065866,
      "SigningPubKey" : "ED701045F5FA55A54CD4076E89CD3B0E426DD3A29192D71264266877D76E5B14C5",
      "TransactionType" : "Payment",
      "TxnSignature" : "FD4584650E423A94B65375132BEF13BF91D97B2307489ECE57FB5ABA65CCEC9DF1187413A4B624DEA38B4361BED6B8E10BDB7C01E7EE5B34151A1FED774A0A0C",
      "ctid" : "C65D6ABC00140000",
      "date" : 841954380,
      "hash" : "10160F06FECBCD1014E1274E5396522D6FD9C5B8B666ABDFC42BAD9AE8003331",
      "inLedger" : 106785468,
      "ledger_index" : 106785468,
      "meta" : {
         "AffectedNodes" : [
            {
               "ModifiedNode" : {
                  "FinalFields" : {
                     "Account" : "rMVyA5ELV2TvPbkVcEXn2JsjS8MWh7ye67",
                     "Balance" : "27208362",
                     "Flags" : 0,
                     "OwnerCount" : 6,
                     "Sequence" : 105065867
                  },
                  "LedgerEntryType" : "AccountRoot",
                  "LedgerIndex" : "5A674272CF256B1010B28B299B41E4A7EF9816E5277653E822A1A704B04FCB93",
                  "PreviousFields" : {
                     "Balance" : "25060046",
                     "Sequence" : 105065866
                  },
                  "PreviousTxnID" : "0BEEBD045A91F9F672321C6A99139072AFDAE2B417BC2328AC38E7863FDD00B6",
                  "PreviousTxnLgrSeq" : 106785466
               }
            },
            {
               "ModifiedNode" : {
                  "FinalFields" : {
                     "Balance" : {
                        "currency" : "536B657463680000000000000000000000000000",
                        "issuer" : "rrrrrrrrrrrrrrrrrrrrBZbvji",
                        "value" : "-19445033.1480965"
                     },
                     "Flags" : 2228224,
                     "HighLimit" : {
                        "currency" : "536B657463680000000000000000000000000000",
                        "issuer" : "rMVyA5ELV2TvPbkVcEXn2JsjS8MWh7ye67",
                        "value" : "13112973224.03277"
                     },
                     "HighNode" : "2",
                     "LowLimit" : {
                        "currency" : "536B657463680000000000000000000000000000",
                        "issuer" : "rKqoG3EJLokTMVEjyFMmTaz9DX2cgJFaLu",
                        "value" : "0"
                     },
                     "LowNode" : "36"
                  },
                  "LedgerEntryType" : "RippleState",
                  "LedgerIndex" : "7A8863B97A15B5EE0232BCA14963499423B7CBBE36B1A7FDB48676446C195767",
                  "PreviousFields" : {
                     "Balance" : {
                        "currency" : "536B657463680000000000000000000000000000",
                        "issuer" : "rrrrrrrrrrrrrrrrrrrrBZbvji",
                        "value" : "-21486823.22161266"
                     }
                  },
                  "PreviousTxnID" : "0BEEBD045A91F9F672321C6A99139072AFDAE2B417BC2328AC38E7863FDD00B6",
                  "PreviousTxnLgrSeq" : 106785466
               }
            },
            {
               "ModifiedNode" : {
                  "FinalFields" : {
                     "Balance" : {
                        "currency" : "536B657463680000000000000000000000000000",
                        "issuer" : "rrrrrrrrrrrrrrrrrrrrBZbvji",
                        "value" : "2330009602.175107"
                     },
                     "Flags" : 17367040,
                     "HighLimit" : {
                        "currency" : "536B657463680000000000000000000000000000",
                        "issuer" : "rKqoG3EJLokTMVEjyFMmTaz9DX2cgJFaLu",
                        "value" : "0"
                     },
                     "HighNode" : "8",
                     "LowLimit" : {
                        "currency" : "536B657463680000000000000000000000000000",
                        "issuer" : "rnrnAWQtbKZQyp9waHnsPNkWVNAQdSBB23",
                        "value" : "0"
                     },
                     "LowNode" : "0"
                  },
                  "LedgerEntryType" : "RippleState",
                  "LedgerIndex" : "BD4BA0E73A019184D89FCF84309030F92954F2519F9A296D25D10ED7D2E0B2D8",
                  "PreviousFields" : {
                     "Balance" : {
                        "currency" : "536B657463680000000000000000000000000000",
                        "issuer" : "rrrrrrrrrrrrrrrrrrrrBZbvji",
                        "value" : "2327967812.101591"
                     }
                  },
                  "PreviousTxnID" : "6CD3BAE567981119102DC39354AF331928AB4796960628A682D3EF615EC6B20C",
                  "PreviousTxnLgrSeq" : 106785468
               }
            },
            {
               "ModifiedNode" : {
                  "FinalFields" : {
                     "AMMID" : "81967EFC394BBD7D1ABF716FD1B7B02D39D250C1232620CB8C51E871FC2E891C",
                     "Account" : "rnrnAWQtbKZQyp9waHnsPNkWVNAQdSBB23",
                     "Balance" : "2474189130",
                     "Flags" : 26214400,
                     "OwnerCount" : 1,
                     "Sequence" : 96320023
                  },
                  "LedgerEntryType" : "AccountRoot",
                  "LedgerIndex" : "F849D9ECD1AE552BD83E4074EC4859265A7DE5B2D4FE45B60C575DD76D2BD8FD",
                  "PreviousFields" : {
                     "Balance" : "2476337466"
                  },
                  "PreviousTxnID" : "6CD3BAE567981119102DC39354AF331928AB4796960628A682D3EF615EC6B20C",
                  "PreviousTxnLgrSeq" : 106785468
               }
            }
         ],
         "TransactionIndex" : 20,
         "TransactionResult" : "tesSUCCESS",
         "delivered_amount" : "2148336"
      },
      "status" : "success",
      "validated" : true
   }
}

There are three unusual things I can see about this payment path:

• The Sketch currency appears twice, as SendMax and the last hop of the path before the XRP Amount.
• XRP appears twice as the Amount and the middle hop of the path.
• The AMM account (rnrnAWQtbKZQyp9waHnsPNkWVNAQdSBB23) is in the path in rippling format, which makes no sense.

To me it looks like someone might have fuzz-tested a weird payment path spec which has some other uses!