8.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.6 High
AI Score
Confidence
High
0.002 Low
EPSS
Percentile
51.8%
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.
8.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.6 High
AI Score
Confidence
High
0.002 Low
EPSS
Percentile
51.8%