High severity · published Feb 13, 2018
CVE-2018-6954
systemd-tmpfiles in systemd through 237 mishandles symlinks present in non-terminal path components, which allows local users to obtain ownership of arbitrary files via vectors…
7.8
CVSS
0.5%
EPSS
No
On KEV
Description
systemd-tmpfiles in systemd through 237 mishandles symlinks present in non-terminal path components, which allows local users to obtain ownership of arbitrary files via vectors involving creation of a directory and a file under that directory, and later replacing that directory with a symlink. This occurs even if the fs.protected_symlinks sysctl is turned on.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 44% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LE
Leap · Opensuse
42.3 · source: NVD
SY
Systemd · Systemd Project
through 237 · source: NVD
UL
Ubuntu Linux · Canonical
16.04; 18.04; 18.10 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-6954
CVE.org
https://www.cve.org/CVERecord?id=CVE-2018-6954
Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00062.html
Exploit
https://github.com/systemd/systemd/issues/7986
lists.apache.org
https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
lists.apache.org
https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
Third Party Advisory
https://usn.ubuntu.com/3816-1/
Third Party Advisory
https://usn.ubuntu.com/3816-2/
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