Link following in Fail2ban - CVE-2009-5023
Published: June 10, 2014 / Updated: August 10, 2020
Vulnerability identifier: #VU41566
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2009-5023
CWE-ID: CWE-59
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Fail2ban
Affected software:
Fail2ban
Fail2ban
Detailed vulnerability description
The vulnerability allows a remote non-authenticated attacker to manipulate data.
The (1) dshield.conf, (2) mail-buffered.conf, (3) mynetwatchman.conf, and (4) mynetwatchman.conf actions in action.d/ in Fail2ban before 0.8.5 allows local users to write to arbitrary files via a symlink attack on temporary files with predictable names, as demonstrated by /tmp/fail2ban-mail.txt.
How to mitigate CVE-2009-5023
Install update from vendor's website.