CVE-2007-4321

NameCVE-2007-4321
Descriptionfail2ban 0.8 and earlier does not properly parse sshd log files, which allows remote attackers to add arbitrary hosts to the /etc/hosts.deny file and cause a denial of service by adding arbitrary IP addresses to the sshd log file, as demonstrated by logging in via ssh with a client protocol version identification containing an IP address string, a different vector than CVE-2006-6302.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDSA-1456-1
Debian Bugs438187

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
fail2ban (PTS)buster0.10.2-2.1fixed
bullseye0.11.2-2fixed
bookworm1.0.2-2fixed
sid, trixie1.0.2-3fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
fail2bansourceetch0.7.5-2etch1DSA-1456-1
fail2bansource(unstable)0.8.0-4medium438187

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