Link following in Fail2ban - CVE-2009-5023

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Main Vulnerability Database Vulnerabilities #VU41566

Link following in Fail2ban - CVE-2009-5023

Published: June 10, 2014 / Updated: August 10, 2020


Vulnerability identifier: #VU41566
CSH Severity: Medium
CVSS v4: 6.9 [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]
CVE-ID: CVE-2009-5023
CWE-ID: CWE-59
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

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.


Affected software

Fail2ban
Gentoo Linux
Fedora
fail2ban

How to mitigate CVE-2009-5023

Install update from vendor's website.

fail2ban - addressed in versions 0.8.4-28.el6, 0.8.4-29.el5

External References

Related Security Bulletins