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Rustpad – Multi-Threaded Padding Oracle Attacks Against Any Service

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A multi-threaded what now?

rustpad is a multi-threaded successor to the classic padbuster, written in Rust. It abuses a Padding Oracle vulnerability to decrypt any cypher text or encrypt arbitrary plain text without knowing the encryption key!

  • Decryption of cypher texts
  • Encryption of arbitrary plain text
  • Multi-threading on both block and byte level
  • Modern, real-time and interactive TUI!
  • No-TTY support, so you can just pipe output to a file
  • Supports Web server oracles…
  • … and Script-based oracles. For when you need just that extra bit of control.
  • Automated calibration of web oracle’s (in)correct padding response
  • Progress bar and automated retries
  • Smart detection of cypher text encoding, supporting: hex, base64, base64url
  • No IV support
  • Written in purely safe Rust, making sure you don’t encounter nasty crashes

Using rustpad to attack a padding oracle is easy. It requires only 4 pieces of information to start:

  • target oracle (--oracle)
  • cypher text to decrypt (--decrypt)
  • block size (--block-size)
  • type of oracle (web/script, see below)

<div class="snippet-clipboard-content position-relative overflow-auto" data-snippet-clipboard-copy-content="; rustpad –help rustpad Multi-threaded Padding Oracle attacks against any service. USAGE: rustpad [OPTIONS] –block-size <block_size> –decrypt <decrypt> –oracle <oracle> <SUBCOMMAND> OPTIONS: -B, –block-size <block_size> Block size used by the cypher [possible values: 8, 16] -D, –decrypt <decrypt> Original cypher text, received from the target service, which is to be decrypted –delay <delay> Delay between requests within a thread, in milliseconds [default: 0] -e, –encoding <encoding> Specify encoding used by the oracle to encode the cypher text [default: auto] [possible values: auto, base64, base64url, hex] -E, –encrypt <encrypt> Plain text to encrypt. Encryption mode requires a cypher text to gather necessary data -h, –help Prints help information –no-cache Disable reading and writing to the cache file -n, –no-iv Cypher text does not include an Initialisation Vector –no-url-encode Disable URL encoding and decoding of cypher text -O, –oracle <oracle> The oracle to question with forged cypher texts. This can be a URL or a shell script. See the subcommands `web –help` and `script –help` respectively for further help. -o, –output <output> File path to which log output will be written -t, –threads <threads> Amount of threads in the thread pool -V, –version Prints version information -v, –verbose Increase verbosity of logging SUBCOMMANDS: web Question a web-based oracle script Question a script-based oracle”>

; rustpad --help rustpad Multi-threaded Padding Oracle attacks against any service. USAGE: rustpad [OPTIONS] --block-size <block_size> --decrypt <decrypt> --oracle <oracle> <SUBCOMMAND> OPTIONS: -B, --block-size <block_size> Block size used by the cypher [possible values: 8, 16] -D, --decrypt <decrypt> Original cypher text, received from the target service, which is to be decrypted --delay <delay> Delay between requests within a thread, in milliseconds [default: 0] -e, --encoding <encoding> Specify encoding used by the oracle to encode the cypher text [default: auto] [possible values: auto, base64, base64url, hex] -E, --encrypt <encrypt> Plain text to encrypt. Encryption mode requires a cypher text to gather necessary data -h, --help Prints help information --no-cache Disable reading and writing to the cache file -n, --no-iv Cypher text does not include an Initialisation Vector --no-url-encode Disable URL encoding and decoding of cypher text -O, --oracle <oracle> The oracle to question with forged cypher texts. This can be a URL or a shell script. See the subcommands `web --help` and `script --help` respectively for further help. -o, --output <output> File path to which log output will be written -t, --threads <threads> Amount of threads in the thread pool -V, --version Prints version information -v, --verbose Increase verbosity of logging SUBCOMMANDS: web Question a web-based oracle script Question a script-based oracle

Web mode

Web mode specifies that the oracle is located on the web. In other words, the oracle is a web server with a URL.

For a padding oracle attack to succeed, an oracle must say so if a cypher text with incorrect padding was provided. rustpad will analyse the oracle’s responses and automatically calibrate itself to the oracle’s behaviour.

<div class="snippet-clipboard-content position-relative overflow-auto" credentials data-snippet-clipboard-copy-content="; rustpad web –help rustpad-web Question a web-based oracle USAGE: rustpad –block-size –decrypt –oracle web [OPTIONS] OPTIONS: -c, –consider-body Consider the response body and content length when determining the web oracle’s response to (in)correct padding -d, –data Data to send in a POST request –delay Delay between requests within a thread, in milliseconds [default: 0] -e, –encoding Specify encoding used by the oracle to encode the cypher text [default: auto] [possible values: auto, base64, base64url, hex] -h, –help Prints help information -H, –header

… HTTP header to send -k, –insecure Disable TLS certificate validation -K, –keyword Keyword indicating the location of the cypher text in the HTTP request. It is replaced by the cypher text’s value at runtime [default: CTEXT] –no-cache Disable reading and writing to the cache file -n, –no-iv Cypher text does not include an Initialisation Vector –no-url-encode Disable URL encoding and decoding of cypher text -o, –output File path to which log output will be written -x, –proxy Proxy server to send web requests over. Supports HTTP(S) and SOCKS5 –proxy-credentials Credentials to authenticate against the proxy server with [format: <user>:<pass>] -r, –redirect Follow 302 Redirects -t, –threads <threads> Amount of threads in the thread pool -T, –timeout <timeout> Web request timeout in seconds [default: 10] -A, –user-agent <user_agent> User-agent to identify with [default: rustpad/<version>] -v, –verbose Increase verbosity of logging Indicate the cypher text’s location! See `–keyword` for clarification.”>

; rustpad web --help rustpad-web Question a web-based oracle USAGE: rustpad --block-size <block_size> --decrypt <decrypt> --oracle <oracle> web [OPTIONS] OPTIONS: -c, --consider-body Consider the response body and content length when determining the web oracle's response to (in)correct padding -d, --data <data> Data to send in a POST request --delay <delay> Delay between requests within a thread, in milliseconds [default: 0] -e, --encoding <encoding> Specify encoding used by the oracle to encode the cypher text [default: auto] [possible values: auto, base64, base64url, hex] -h, --help Prints help information -H, --header <header>... HTTP header to send -k, --insecure Disable TLS certificate validation -K, --keyword <keyword> Keyword indicating the location of the cypher text in the HTTP request. It is replaced by the cypher text's value at runtime [default: CTEXT] --no-cache Disable reading and writing to the cache file -n, --no-iv Cypher text does not include an Initialisation Vector --no-url-encode Disable URL encoding and decoding of cypher text -o, --output <output> File path to which log output will be written -x, --proxy <proxy> Proxy server to send web requests over. Supports HTTP(S) and SOCKS5 --proxy-credentials <proxy_credentials> Credentials to authenticate against the proxy server with [format: <user>:<pass>] -r, --redirect Follow 302 Redirects -t, --threads <threads> Amount of threads in the thread pool -T, --timeout <timeout> Web request timeout in seconds [default: 10] -A, --user-agent <user_agent> User-agent to identify with [default: rustpad/<version>] -v, --verbose Increase verbosity of logging Indicate the cypher text's location! See `--keyword` for clarification.

Script mode

Script mode was made for power users or CTF players

‍who were given a script to run. The target oracle is a local shell script.

Scripts allow you to run attacks against local oracles or more exotic services. Or you can use script mode to customise and extend rustpad‘s features. However, if you’re missing a feature, feel free to open an issue on GitHub!

<div class="snippet-clipboard-content position-relative overflow-auto" data-snippet-clipboard-copy-content="; rustpad script –help rustpad-script Question a script-based oracle USAGE: rustpad –block-size –decrypt –oracle script [OPTIONS] OPTIONS: –delay Delay between requests within a thread, in milliseconds [default: 0] -e, –encoding Specify encoding used by the oracle to encode the cypher text [default: auto] [possible values: auto, base64, base64url, hex] -h, –help Prints help information –no-cache Disable reading and writing to the cache file -n, –no-iv Cypher text does not include an Initialisation Vector –no-url-encode Disable URL encoding and decoding of cypher text -o, –output File path to which log output will be written -t, –threads Amount of threads in the thread pool -v, –verbose Increase verbosity of logging Script must respond with exit code 0 for correct padding, and any other code otherwise. Cypher text is passed as the 1st argument.”>

; rustpad script --help rustpad-script Question a script-based oracle USAGE: rustpad --block-size <block_size> --decrypt <decrypt> --oracle <oracle> script [OPTIONS] OPTIONS: --delay <delay> Delay between requests within a thread, in milliseconds [default: 0] -e, --encoding <encoding> Specify encoding used by the oracle to encode the cypher text [default: auto] [possible values: auto, base64, base64url, hex] -h, --help Prints help information --no-cache Disable reading and writing to the cache file -n, --no-iv Cypher text does not include an Initialisation Vector --no-url-encode Disable URL encoding and decoding of cypher text -o, --output <output> File path to which log output will be written -t, --threads <threads> Amount of threads in the thread pool -v, --verbose Increase verbosity of logging Script must respond with exit code 0 for correct padding, and any other code otherwise. Cypher text is passed as the 1st argument.

Coming soon

Source : KitPloit – PenTest Tools!

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