Link Following

Affecting systemd package, versions *

Report new vulnerabilities
Do your applications use this vulnerable package? Test your applications

Overview

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.

References

CVSS Score

7.8
low severity
  • Attack Vector
    Local
  • Attack Complexity
    Low
  • Privileges Required
    Low
  • User Interaction
    None
  • Scope
    Unchanged
  • Confidentiality
    High
  • Integrity
    High
  • Availability
    High
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVE
CVE-2017-18078
CWE
CWE-59
Snyk ID
SNYK-DEBIAN9-SYSTEMD-305165
Disclosed
29 Jan, 2018
Published
29 Jan, 2018