CLI tool and library to execute
padding oracle attacks easily, with support for concurrent network requests and an elegant UI.
InstallMake sure
Node.js is installed, then run
$ npm install --global padding-oracle-attacker
or
$ yarn global add padding-oracle-attacker
Usage
$ padding-oracle-attacker decrypt <url> hex:<ciphertext_hex> <block_size> <error> [options]
$ padding-oracle-attacker decrypt <url> b64:<ciphertext_b64> <block_size> <error> [options]
$ padding-oracle-attacker encrypt <url> <plaintext> <block_size> <error> [options]
$ padding-oracle-attacker encrypt <url> hex:<plaintext_hex> <block_size> <error> [options]
$ padding-oracle-attacker analyze <url> [<block_size>] [options]
Commands
decrypt Finds the plaintext (foobar) for given ciphertext (hex:0123abcd)
encrypt Finds the ciphertext (hex:abcd1234) for given plaintext (foo=bar)
analyze Helps find out if the URL is vulnerable or not, and
how the response differs when a decryption error occurs
(for the <error> argument)
Arguments
<url> URL to attack. Payload will be inserted at the end by default. To specify
a custom injection point, include {POPAYLOAD} in a header (-H),
request body (-d) or the URL
<block_size> Block size used by the encryption algorithm on the server
<error> The string present in response when decryption fails on the server.
Specify a string present in the HTTP response body (like PaddingException)
or status code of the HTTP response (like 400)
Options
-c, --concurrency Requests to be sent concurrently [default: 128]
--disable-cache Disable network cache. Saved to [default: false]
poattack-cache.json.gz.txt by default
-X, --method HTTP method to use while making request [default: GET]
-H, --header Headers to be sent with request.
-H 'Cookie: cookie1' -H 'User-Agent: Googlebot/2.1'
-d, --data Request body
JSON string: {"id": 101, "foo": "bar"}
URL encoded: id=101&foo=bar
Make sure to specify the Content-Type header.
-e, --payload-encoding Ciphertext payload encoding for {POPAYLOAD} [defa ult: hex]
base64 FooBar+/=
base64-urlsafe FooBar-_
hex deadbeef
hex-uppercase DEADBEEF
base64(xyz) Custom base64 ('xyz' represent characters for '+/=')
--dont-urlencode-payload Don't URL encode {POPAYLOAD} [default: false]
--start-from-1st-block Start processing from the first block instead [default: false]
of the last (only works with decrypt mode)
Examples
$ poattack decrypt http://localhost:2020/decrypt?ciphertext=
hex:e3e70d8599206647dbc96952aaa209d75b4e3c494842aa1aa8931f51505df2a8a184e99501914312e2c50320835404e9
16 400
$ poattack encrypt http://localhost:2020/decrypt?ciphertext= "foo bar 🦄" 16 400
$ poattack encrypt http://localhost :2020/decrypt?ciphertext= hex:666f6f2062617220f09fa684 16 400
$ poattack analyze http://localhost:2020/decrypt?ciphertext=
Aliases
poattack
padding-oracle-attack
Library APIconst { decrypt, encrypt } = require('padding-oracle-attacker')
// or
import { decrypt, encrypt } from 'padding-oracle-attacker'
const { blockCount, totalSize, foundBytes, interBytes } = await decrypt(options)
const { blockCount, totalSize, foundBytes, interBytes, finalRequest } = await encrypt(options)
decrypt(options: Object): Promiseencrypt(options: Object): PromiseRequired optionsurl: stringURL to attack. Payload will be appended at the end by default. To specify a custom injection point, include
{POPAYLOAD} in the URL, a header (
requestOptions.headers) or the request body (
requestOptions.data)
blockSize: numberBlock size used by the encryption algorithm on the server.
isDecryptionSuccess: ({ statusCode, headers, body }) => booleanFunction that returns true if the server response indicates decryption was successful.
ciphertext: Buffer (decrypt only)Ciphertext to decrypt.
plaintext: Buffer (encrypt only)Plaintext to encrypt. Padding will be added automatically. Example:
Buffer.from('foo bar', 'utf8')Optional optionsconcurrency: number = 128Network requests to be sent concurrently.
isCacheEnabled: boolean = trueResponses are cached by default and saved to
poattack-cache.json.gz.txt. Set to
false to disable caching.
requestOptions: { method, headers, data }requestOptions.method: stringHTTP method to use while making the request.
GET by default.
POST,
PUT,
DELETE are some valid options.
requestOptions.headers: { string: string }Headers to be sent with request. Example:
{ 'Content-Type': 'application/x-www-form-urlencoded' }requestOptions.body: stringRequest body. Can be a JSON string, URL encoded params etc.
Content-Type header has to be set manually.
logMode: 'full'|'minimal'|'none' = 'full'full: Log everything to console (default)
minimal: Log only after start and completion to console
none: Log nothing to console
transformPayload: (ciphertext: Buffer) => stringFunction to convert the
ciphertext into a string when making a request. By default,
ciphertext is encoded in hex and inserted at the injection point (URL end unless
{POPAYLOAD} is present).
Optional options (decrypt only)alreadyFound: BufferPlaintext bytes already known/found that can be skipped (from the end). If you provide a
Buffer of ten bytes, the last ten bytes will be skipped.
initFirstPayloadBlockWithOrigBytes: boolean = falseInitialize first payload block with original
ciphertext bytes instead of zeroes.
Example:
abcdef12345678ff 1111111111111111 instead of
00000000000000ff 1111111111111111startFromFirstBlock: boolean = falseStart processing from the first block instead of the last.
makeInitialRequest: boolean = trueMake an initial request with the original
ciphertext provided and log server response to console to allow the user to make sure network requests are being sent correctly.
Optional options (encrypt only)makeFinalRequest: boolean = trueAfter finding the
ciphertext bytes for the new
plaintext, make a final request with the found bytes and log the server response to console.
lastCiphertextBlock: BufferCustom ciphertext for the last block. Last block is just zeroes by default (
000000000000000).
Developingpadding-oracle-attacker is written in TypeScript. If you'd like to modify the source files and run them, you can either compile the files into JS first and run them using node, or use
ts-node.
Example:
yarn build then
node dist/cli ... or simply
ts-node src/cli ...yarn build or npm run buildBuilds the TypeScript files inside the
src directory to JS files and outputs them to the
dist directory.
yarn clean or npm run cleanDeletes the
dist directory.
yarn lint or npm run lintLints the files using eslint.
yarn test or npm run testLints and runs the tests using ava.
node test/helpers/vulnerable-server.jsRuns the test server which is vulnerable to padding oracle attacks at
http://localhost:2020Related![]()
