CVE-2018-19044 - Improper Link Resolution Before File Access ('Link Following')

Severity

32%

Complexity

34%

Confidentiality

81%

keepalived 2.0.8 didn't check for pathnames with symlinks when writing data to a temporary file upon a call to PrintData or PrintStats. This allowed local users to overwrite arbitrary files if fs.protected_symlinks is set to 0, as demonstrated by a symlink from /tmp/keepalived.data or /tmp/keepalived.stats to /etc/passwd.

keepalived 2.0.8 didn't check for pathnames with symlinks when writing data to a temporary file upon a call to PrintData or PrintStats. This allowed local users to overwrite arbitrary files if fs.protected_symlinks is set to 0, as demonstrated by a symlink from /tmp/keepalived.data or /tmp/keepalived.stats to /etc/passwd.

CVSS 3.0 Base Score 4.7. CVSS Attack Vector: local. CVSS Attack Complexity: high. CVSS Vector: (CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N).

CVSS 2.0 Base Score 3.3. CVSS Attack Vector: local. CVSS Attack Complexity: medium. CVSS Vector: (AV:L/AC:M/Au:N/C:N/I:P/A:P).

Overview

First reported 6 years ago

2018-11-08 20:29:00

Last updated 5 years ago

2019-08-06 17:15:00

Affected Software

Keepalived 2.0.8

2.0.8

References

RHSA-2019:2285

https://bugzilla.suse.com/show_bug.cgi?id=1015141

Issue Tracking, Third Party Advisory

https://github.com/acassen/keepalived/commit/04f2d32871bb3b11d7dc024039952f2fe2750306

Patch, Third Party Advisory

https://github.com/acassen/keepalived/issues/1048

Exploit, Patch, Third Party Advisory

GLSA-201903-01

Third Party Advisory

Stay updated

ExploitPedia is constantly evolving. Sign up to receive a notification when we release additional functionality.

Get in touch

If you'd like to report a bug or have any suggestions for improvements then please do get in touch with us using this form. We will get back to you as soon as we can.