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Grep Extract Not Working Properly

Tim | Last updated: Mar 24, 2020 03:27PM UTC

Grep extract rules stopped working properly in recent versions. As recently as 2020.1 and still in 2020.2.1, creating a regex rule for a finished attack will not apply to the results, and string parsing rules only apply after enabling and disabling the rule after creation. When creating a regex rule, viewing the results and returning to the options tab shows a broken regex in the list of rules. Recreating the regex does not fix it and results in the same behavior. I have not tested this by creating the rule BEFORE the attack is run, so it may behave differently that way. Thanks!

Ryan | Last updated: Nov 09, 2020 04:45PM UTC

Is this going to be fixed any time soon? This is a really annoying issue. I found a workaround though. You can define a regex extract and then repeat the attack from the menu: Attack -> Repeat

Uthman, PortSwigger Agent | Last updated: Nov 10, 2020 09:13AM UTC

Ryan, this was fixed in 2020.4. I would suggest using the latest version of Burp (2020.11) to avoid any issues.

Ryan | Last updated: Nov 10, 2020 08:21PM UTC

I'm already on 2020.11. This is still an issue for me and at least 3 of my co-workers (who have actually been putting off upgrades for months due to this bug being introduced). I've made a walkthrough of how to reproduce the issue. https://imgur.com/a/53e7u2r

Uthman, PortSwigger Agent | Last updated: Nov 11, 2020 08:57AM UTC

Hi Ryan, Thanks a lot. I have replicated it. We will update this thread when the issue is fixed but cannot provide ETA, unfortunately.

Michelle, PortSwigger Agent | Last updated: Jan 07, 2021 02:59PM UTC