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Can I discuss CBBH exam with someone?
by ghghghgh - Saturday October 14, 2023 at 11:06 AM
#1
I want someone experienced to discuss a vulnerability of the exam
#2
Haven't done the exam but I'm down to listen
#3
(Oct 14, 2023, 11:08 AM)GeneralGrievous Wrote: Haven't done the exam but I'm down to listen

There is a part with blind xxe blind vulnerability, I was able to use php filter to read internal file, then i tried to use expect:// wrapper and curl my local webserver and i got the request, so I guess the expect wrapper is enabled and it can lead to rce. But when i tried for example to `cat somefile > /tmp/somefile` with expect and then read /tmp/somefile with php filter, i dont get anything.

Payload for expect that i used is `expect://curl$IFS'ip/hello'`

My question is what payload i can try to use here if it seems that only curl is working?
#4
(Oct 14, 2023, 11:15 AM)ghghghgh Wrote:
(Oct 14, 2023, 11:08 AM)GeneralGrievous Wrote: Haven't done the exam but I'm down to listen

There is a part with blind xxe blind vulnerability, I was able to use php filter to read internal file, then i tried to use expect:// wrapper and curl my local webserver and i got the request, so I guess the expect wrapper is enabled and it can lead to rce. But when i tried for example to `cat somefile > /tmp/somefile` with expect and then read /tmp/somefile with php filter, i dont get anything.

Payload for expect that i used is `expect://curl$IFS'ip/hello'`

My question is what payload i can try to use here if it seems that only curl is working?

If the only thing you could is send HTTP requests, maybe a SSRF
Are you encoding the payload correctly?
#5
The last non-spam response in the topic was more than a month ago. I close the topic as irrelevant to prevent spam. If this is not the case, please send a pm and I will open the topic for discussion again.


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