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match and replace for the websocket

Alan | Last updated: Jul 19, 2017 02:16PM UTC

Possible to add a match and replace for the websockets? Someone made a plugin for it in the past, but isnt working anymore.

PortSwigger Agent | Last updated: Jul 19, 2017 03:02PM UTC

Hi Alan, Thanks for getting in touch. We're aware that web sockets support is somewhat limited and we do have a long-term plan to improve this. No-one here remembers a match and replace web sockets extension. Do you have any more details about it? I've linked your request to the web sockets development story; we'll update you when we've made progress.

Burp User | Last updated: Jan 04, 2019 11:44PM UTC

A bit late, but you may have seen this: http://evilwan.be/ Although it seems to require some further coding; quote from the web-page: "The bottom part of the extra tab handles automatic modification of WebSocket messages. For this to work, a custom Java class has to be written that implements interface "evilwan.WSFilter" and the name of that Java class (including package name) has to be specified in the extension configuration tab. A toggle button can be clicked to activate or deactivate automatic modification of WebSocket messages." Alan

Kirill | Last updated: May 15, 2020 06:05AM UTC

Hi! Are there any updates on this feature? Or maybe exist some fresh extension for this purpose?

Michelle, PortSwigger Agent | Last updated: May 15, 2020 11:48AM UTC

There aren't any new extensions in the BApp store relating to this kind of thing, could you tell us a bit more about how you'd like to see things work so we can make sure we've got your ideas captured properly?

Kirill | Last updated: May 15, 2020 01:41PM UTC

List of settings with params. WS Url: Url of WS connection; Types: Message to server / Message to client; Operations: Block / Match&Replace / Periodically. --- Block: Match by regexp and drop the message. Match&Replace: Match by regexp, change catched message (usage regexp substitutions) or create a new one, and forward the message. Periodically: Send one message at specified intervals (in milliseconds). "Block" doesn't effect on "Match&Replace" and "Periodically" generated messages. "Match&Replace" doesn't effect on "Periodically" generated messages. Maybe Up and Down settings can be used for managing the flow.

Kirill | Last updated: May 15, 2020 01:41PM UTC

List of settings with params. WS Url: Url of WS connection; Types: Message to server / Message to client; Operations: Block / Match&Replace / Periodically. --- Block: Match by regexp and drop the message. Match&Replace: Match by regexp, change catched message (usage regexp substitutions) or create a new one, and forward the message. Periodically: Send one message at specified intervals (in milliseconds). "Block" doesn't effect on "Match&Replace" and "Periodically" generated messages. "Match&Replace" doesn't effect on "Periodically" generated messages. Maybe Up and Down settings can be used for managing the flow.

Michelle, PortSwigger Agent | Last updated: May 19, 2020 12:23PM UTC

Thanks for sending that over. To make sure I'm understanding things correctly, could you also describe a scenario explaining what your workflow might look like if you had those options available in Burp?

Praveen | Last updated: Aug 07, 2020 10:23AM UTC

Hi, I had a requirement for a similar scenario. The app updates certain sensitive parameters from the browser to the server side using websocket calls. However tampering these values is a challenge. Auto match and replace will work well in these scenarios. Thanks.

Michelle, PortSwigger Agent | Last updated: Aug 07, 2020 12:33PM UTC