GLSA-200710-14 : DenyHosts: Denial of Service

Medium Nessus Plugin ID 27049


The remote Gentoo host is missing one or more security-related patches.


The remote host is affected by the vulnerability described in GLSA-200710-14 (DenyHosts: Denial of Service)

Daniel B. Cid discovered that DenyHosts used an incomplete regular expression to parse failed login attempts, a different issue than GLSA 200701-01.
Impact :

A remote unauthenticated attacker can add arbitrary hosts into the blacklist, including the 'all' keyword, by submitting specially crafted version identification strings to the SSH server banner. An attacker may use this to prevent legitimate users from accessing a host remotely.
Workaround :

There is no known workaround at this time.


All DenyHosts users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose '>=app-admin/denyhosts-2.6-r1'

See Also

Plugin Details

Severity: Medium

ID: 27049

File Name: gentoo_GLSA-200710-14.nasl

Version: $Revision: 1.11 $

Type: local

Published: 2007/10/15

Modified: 2015/04/13

Dependencies: 12634

Risk Information

Risk Factor: Medium


Base Score: 6.8

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P

Vulnerability Information

CPE: p-cpe:/a:gentoo:linux:denyhosts, cpe:/o:gentoo:linux

Required KB Items: Host/local_checks_enabled, Host/Gentoo/release, Host/Gentoo/qpkg-list

Patch Publication Date: 2007/10/13

Vulnerability Publication Date: 2006/12/04

Reference Information

CVE: CVE-2007-4323

OSVDB: 31067, 42482

GLSA: 200710-14