gRPC-Web Pentest

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• As jy wil sien dat jou maatskappy geadverteer word in HackTricks of HackTricks aflaai in PDF-formaat, kyk na die SUBSCRIPTION PLANS!

• Kry die amptelike PEASS & HackTricks swag

• Ontdek The PEASS Family, ons versameling van eksklusiewe NFTs

• Sluit aan by die 💬 Discord-groep of die telegram-groep of volg ons op Twitter 🐦 @carlospolopm.

• Deel jou hacking-truuks deur PR's in te dien by die HackTricks en HackTricks Cloud github-repos.

Manipulering van gRPC-Web-pakette

gRPC-Web gebruik Content-Type: application/grpc-web-text in versoeke wat 'n soort protobuf in base64-geënkripteerde vorm is. Jy kan die gprc-coder hulpmiddel gebruik, en jy kan ook sy Burp Suite-uitbreiding installeer.

Handmatig met gGRPC Coder Tool

1. Dekodeer die pakket eerste:

echo "AAAAABYSC0FtaW4gTmFzaXJpGDY6BVhlbm9u" | python3 grpc-coder.py --decode --type grpc-web-text | protoscope > out.txt

2. Wysig die inhoud van die gedekodeerde payload

nano out.txt
2: {"Amin Nasiri Xenon GRPC"}
3: 54
7: {"<script>alert(origin)</script>"}

3. Enkodeer die nuwe vrag

protoscope -s out.txt | python3 grpc-coder.py --encode --type grpc-web-text

4. Gebruik uitvoer in Burp interceptor:

AAAAADoSFkFtaW4gTmFzaXJpIFhlbm9uIEdSUEMYNjoePHNjcmlwdD5hbGVydChvcmlnaW4pPC9zY3JpcHQ+

Handleiding met gRPC-Web Coder Burp Suite-uitbreiding

Jy kan die gRPC-Web Coder Burp Suite-uitbreiding gebruik in die gRPC-Web Pentest Suite wat makliker is. Jy kan die installasie- en gebruiksinstruksies in sy bewaarplek lees.

Ontleding van gRPC-Web Javascript-lêers

Daar is ten minste een Javascript-lêer in elke gRPC-Web-toepassing. Jy kan die lêer ontleed om nuwe boodskappe, eindpunte en dienste te vind. Probeer die gRPC-Scan instrument gebruik.

1. Laai die Javascript gRPC-Web-lêer af

2. Skandeer dit met grpc-scan.py:

python3 grpc-scan.py --file main.js

3. Analiseer die uitset en toets die nuwe eindpunte en nuwe dienste:

Output:
Found Endpoints:
/grpc.gateway.testing.EchoService/Echo
/grpc.gateway.testing.EchoService/EchoAbort
/grpc.gateway.testing.EchoService/NoOp
/grpc.gateway.testing.EchoService/ServerStreamingEcho
/grpc.gateway.testing.EchoService/ServerStreamingEchoAbort

Found Messages:

grpc.gateway.testing.EchoRequest:
+------------+--------------------+--------------+
| Field Name |     Field Type     | Field Number |
+============+====================+==============+
| Message    | Proto3StringField  | 1            |
+------------+--------------------+--------------+
| Name       | Proto3StringField  | 2            |
+------------+--------------------+--------------+
| Age        | Proto3IntField     | 3            |
+------------+--------------------+--------------+
| IsAdmin    | Proto3BooleanField | 4            |
+------------+--------------------+--------------+
| Weight     | Proto3FloatField   | 5            |
+------------+--------------------+--------------+
| Test       | Proto3StringField  | 6            |
+------------+--------------------+--------------+
| Test2      | Proto3StringField  | 7            |
+------------+--------------------+--------------+
| Test3      | Proto3StringField  | 16           |
+------------+--------------------+--------------+
| Test4      | Proto3StringField  | 20           |
+------------+--------------------+--------------+

grpc.gateway.testing.EchoResponse:
+--------------+--------------------+--------------+
|  Field Name  |     Field Type     | Field Number |
+==============+====================+==============+
| Message      | Proto3StringField  | 1            |
+--------------+--------------------+--------------+
| Name         | Proto3StringField  | 2            |
+--------------+--------------------+--------------+
| Age          | Proto3IntField     | 3            |
+--------------+--------------------+--------------+
| IsAdmin      | Proto3BooleanField | 4            |
+--------------+--------------------+--------------+
| Weight       | Proto3FloatField   | 5            |
+--------------+--------------------+--------------+
| Test         | Proto3StringField  | 6            |
+--------------+--------------------+--------------+
| Test2        | Proto3StringField  | 7            |
+--------------+--------------------+--------------+
| Test3        | Proto3StringField  | 16           |
+--------------+--------------------+--------------+
| Test4        | Proto3StringField  | 20           |
+--------------+--------------------+--------------+
| MessageCount | Proto3IntField     | 8            |
+--------------+--------------------+--------------+

grpc.gateway.testing.ServerStreamingEchoRequest:
+-----------------+-------------------+--------------+
|   Field Name    |    Field Type     | Field Number |
+=================+===================+==============+
| Message         | Proto3StringField | 1            |
+-----------------+-------------------+--------------+
| MessageCount    | Proto3IntField    | 2            |
+-----------------+-------------------+--------------+
| MessageInterval | Proto3IntField    | 3            |
+-----------------+-------------------+--------------+

grpc.gateway.testing.ServerStreamingEchoResponse:
+------------+-------------------+--------------+
| Field Name |    Field Type     | Field Number |
+============+===================+==============+
| Message    | Proto3StringField | 1            |
+------------+-------------------+--------------+

grpc.gateway.testing.ClientStreamingEchoRequest:
+------------+-------------------+--------------+
| Field Name |    Field Type     | Field Number |
+============+===================+==============+
| Message    | Proto3StringField | 1            |
+------------+-------------------+--------------+

grpc.gateway.testing.ClientStreamingEchoResponse:
+--------------+----------------+--------------+
|  Field Name  |   Field Type   | Field Number |
+==============+================+==============+
| MessageCount | Proto3IntField | 1            |
+--------------+----------------+--------------+

Verwysings

• Hacking in gRPC-Web Artikel deur Amin Nasiri

• gRPC-Web Pentest Suite

Leer AWS-hacking van nul tot held met htARTE (HackTricks AWS Red Team Expert)!

Ander maniere om HackTricks te ondersteun:

• As jy jou maatskappy geadverteer wil sien in HackTricks of HackTricks in PDF wil aflaai, kyk na die SUBSCRIPTION PLANS!

• Kry die amptelike PEASS & HackTricks swag

• Ontdek The PEASS Family, ons versameling eksklusiewe NFTs

• Sluit aan by die 💬 Discord-groep of die telegram-groep of volg ons op Twitter 🐦 @carlospolopm.

• Deel jou hacking-truuks deur PR's in te dien by die HackTricks en HackTricks Cloud github-repos.