Link Following Affecting fail2ban package, versions <0.8.4+svn20110323-1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.34% (26th percentile)

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  • Snyk IDSNYK-ECHOLATEST-FAIL2BAN-20877231
  • published13 Oct 2026
  • disclosed10 Jun 2014

Introduced: 10 Jun 2014

CVE-2009-5023  (opens in a new tab)
CWE-59  (opens in a new tab)

How to fix?

Upgrade Echo:latest fail2ban to version 0.8.4+svn20110323-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream fail2ban package and not the fail2ban package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1