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GLSA-200710-14 : DenyHosts: Denial of Service

medium Nessus Plugin ID 27049

Synopsis

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

Description

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.

Solution

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

See Also

https://security.gentoo.org/glsa/200710-14

Plugin Details

Severity: Medium

ID: 27049

File Name: gentoo_GLSA-200710-14.nasl

Version: 1.14

Type: local

Published: 10/15/2007

Updated: 1/6/2021

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.8

CVSS v2

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: 10/13/2007

Vulnerability Publication Date: 12/4/2006

Reference Information

CVE: CVE-2007-4323

GLSA: 200710-14