CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
EPSS
Percentile
91.6%
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.
#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Gentoo Linux Security Advisory GLSA 200710-14.
#
# The advisory text is Copyright (C) 2001-2015 Gentoo Foundation, Inc.
# and licensed under the Creative Commons - Attribution / Share Alike
# license. See http://creativecommons.org/licenses/by-sa/3.0/
#
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(27049);
script_version("1.14");
script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/06");
script_cve_id("CVE-2007-4323");
script_xref(name:"GLSA", value:"200710-14");
script_name(english:"GLSA-200710-14 : DenyHosts: Denial of Service");
script_summary(english:"Checks for updated package(s) in /var/db/pkg");
script_set_attribute(
attribute:"synopsis",
value:
"The remote Gentoo host is missing one or more security-related
patches."
);
script_set_attribute(
attribute:"description",
value:
"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."
);
script_set_attribute(
attribute:"see_also",
value:"https://security.gentoo.org/glsa/200710-14"
);
script_set_attribute(
attribute:"solution",
value:
"All DenyHosts users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose '>=app-admin/denyhosts-2.6-r1'"
);
script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:gentoo:linux:denyhosts");
script_set_attribute(attribute:"cpe", value:"cpe:/o:gentoo:linux");
script_set_attribute(attribute:"patch_publication_date", value:"2007/10/13");
script_set_attribute(attribute:"plugin_publication_date", value:"2007/10/15");
script_set_attribute(attribute:"vuln_publication_date", value:"2006/12/04");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2007-2021 Tenable Network Security, Inc.");
script_family(english:"Gentoo Local Security Checks");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/Gentoo/release", "Host/Gentoo/qpkg-list");
exit(0);
}
include("audit.inc");
include("global_settings.inc");
include("qpkg.inc");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Gentoo/release")) audit(AUDIT_OS_NOT, "Gentoo");
if (!get_kb_item("Host/Gentoo/qpkg-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
flag = 0;
if (qpkg_check(package:"app-admin/denyhosts", unaffected:make_list("ge 2.6-r1"), vulnerable:make_list("lt 2.6-r1"))) flag++;
if (flag)
{
if (report_verbosity > 0) security_warning(port:0, extra:qpkg_report_get());
else security_warning(0);
exit(0);
}
else
{
tested = qpkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, "DenyHosts");
}