CVE-2009-5023

Severity: medium (CVSS 4.7 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2014-06-10 · updated 2026-06-16
Weakness: CWE-59

Description

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 products

fail2ban: through 0.8.4; 0.1.0, 0.1.1, 0.1.2, 0.3.0, 0.3.1, 0.4.0 (+23)

References

http://secunia.com/advisories/58841
http://security.gentoo.org/glsa/glsa-201406-03.xml
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=544232
https://github.com/fail2ban/fail2ban/blob/sdist/0.8.5/ChangeLog
http://secunia.com/advisories/58841
http://security.gentoo.org/glsa/glsa-201406-03.xml
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=544232
https://github.com/fail2ban/fail2ban/blob/sdist/0.8.5/ChangeLog

Get alerted when CVE-2009-5023 or the next vulnerability affects your stack