Did he also manage to delete the access logs, if not then you can check those out and see if there are any strange queries from around the time you noticed the site got backdoored.
This will determine if the vulnerability was in the MyBB code or in a vulnerable plugin that you had added to the forum.
Very doubtful that he "used a backdoor in mybb". Considering the fact you're asking how to prevent it from happening again instead of requesting the team fix this alleged backdoor, it sounds like you don't know how it happened.
If you're going off his word, perhaps consider that someone malicious enough to destroy your forum might also be a liar.
Sounds like he used the frontdoor instead of a backdoor.
Just a thought while enjoying some cookies, but perhaps look at your server and or any possible human related issues that may have compromised your security details and any potential issues found there first rather than assuming mybb as the potential initial culprit. Best of luck.
Did this dude you know ever have access to your FTP client or web hosting CP? Sounds like he uploaded a web shell, not a flaw in MyBB.
(2019-09-15, 08:08 AM)0xB9 Wrote: [ -> ]Did this dude you know ever have access to your FTP client or web hosting CP? Sounds like he uploaded a web shell, not a flaw in MyBB.
If he has access to the FTP, it's not a web shell. It's as easy as uploading a new index file with header location in it.
(2019-09-08, 06:52 PM)NoRules Wrote: [ -> ] (2019-09-08, 06:30 PM)vintagedaddyo Wrote: [ -> ]Just a thought while enjoying some cookies
Cookies....., yummy!
Indeed...
(2019-09-15, 09:54 AM)Ben Cousins Wrote: [ -> ] (2019-09-15, 08:08 AM)0xB9 Wrote: [ -> ]Did this dude you know ever have access to your FTP client or web hosting CP? Sounds like he uploaded a web shell, not a flaw in MyBB.
If he has access to the FTP, it's not a web shell. It's as easy as uploading a new index file with header location in it.
Correct, but in his original post he said that the guy didn't have any access or passwords at the time the site was hacked. That's why I asked if the guy ever had access in the past.