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CURL-CVE-2023-27534
No affected components available
curl supports SFTP transfers. curl's SFTP implementation offers a special
feature in the path component of URLs: a tilde (~) character as the first
path element in the path to denotes a path relative to the user's home
directory. This is supported because of wording in the once proposed
to-become RFC
draft
that was to dictate how SFTP URLs work.
Due to a bug, the handling of the tilde in SFTP path did however not only replace it when it is used stand-alone as the first path element but also wrongly when used as a mere prefix in the first element.
Using a path like /~2/foo when accessing a server using the user dan (with
home directory /home/dan) would then quite surprisingly access the file
/home/dan2/foo.
This can be taken advantage of to circumvent filtering or worse.
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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