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CURL-CVE-2020-8284
No affected components available
When curl performs a passive FTP transfer, it first tries the EPSV command
and if that is not supported, it falls back to using PASV. Passive mode is
what curl uses by default.
A server response to a PASV command includes the (IPv4) address and port
number for the client to connect back to in order to perform the actual data
transfer.
This is how the FTP protocol is designed to work.
A malicious server can use the PASV response to trick curl into connecting
back to a given IP address and port, and this way potentially make curl
extract information about services that are otherwise private and not
disclosed, for example doing port scanning and service banner extractions.
If curl operates on a URL provided by a user (which by all means is an unwise setup), a user can exploit that and pass in a URL to a malicious FTP server instance without needing any server breach to perform the attack.
Measures severity based on intrinsic characteristics of the vulnerability, independent of environment.
No exploitation activity has been observed at this time. Continue routine monitoring.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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