UNIX symbolic link following in Keepalived - CVE-2018-19044
Published: November 10, 2018
Vulnerability identifier: #VU15789
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2018-19044
CWE-ID: CWE-61
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a symlink following issue when writing data to a temporary file upon a call to PrintData or PrintStats. A local user can create a specially crafted symbolic link to a critical file on the system and overwrite it with privileges of the application, if fs.protected_symlinks is set to 0.
Successful exploitation of this vulnerability may result in privilege escalation.
Affected software
Keepalived
Gentoo Linux
Amazon Linux AMI
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux Workstation
Opensuse
Fedora
keepalived (Alpine package)
keepalived
Gentoo Linux
Amazon Linux AMI
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux Workstation
Opensuse
Fedora
keepalived (Alpine package)
keepalived
How to mitigate CVE-2018-19044
Install updates from vendor's website.
Keepalived - update to 2.0.9
keepalived (Alpine package) - update to 2.0.11-r0
keepalived - update to 2.0.10-1.fc29
keepalived (Alpine package) - update to 2.0.11-r0
keepalived - update to 2.0.10-1.fc29