Ubuntu.comUB:CVE-2017-18078CVE-2017-18078
4.6 Medium
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:L/AC:L/Au:N/C:P/I:P/A:P
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
0.001 Low
EPSS
Percentile
26.8%
systemd-tmpfiles in systemd before 237 attempts to support
ownership/permission changes on hardlinked files even if the
fs.protected_hardlinks sysctl is turned off, which allows local users to
bypass intended access restrictions via vectors involving a hard link to a
file for which the user lacks write access, as demonstrated by changing the
ownership of the /etc/passwd file.
Bugs
Notes
| Author | Note |
|---|---|
| ratliff | mitigated by fs.protected_hardlinks = 1 |
| mdeslaur | patch simply refuses to set hardlink file permissions if the kernel hardening feature is turned off, which may result in breakage. We will not be releasing an update for this issue as our default configuration is not vulnerable. |
Related
4.6 Medium
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:L/AC:L/Au:N/C:P/I:P/A:P
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
0.001 Low
EPSS
Percentile
26.8%