Debian DSA-2826-1: denyhosts - remote denial of ssh service. Prevents SSH brute-force attacks by denying forged login names
Reporter | Title | Published | Views | Family All 22 |
---|---|---|---|---|
![]() | denyhosts DoS | 24 Dec 201300:00 | – | securityvulns |
![]() | [SECURITY] [DSA 2826-1] denyhosts security update | 24 Dec 201300:00 | – | securityvulns |
![]() | CVE-2013-6890 | 23 Dec 201322:00 | – | cvelist |
![]() | Fedora Update for denyhosts FEDORA-2014-17067 | 5 Jan 201500:00 | – | openvas |
![]() | Mageia: Security Advisory (MGASA-2014-0080) | 28 Jan 202200:00 | – | openvas |
![]() | Debian Security Advisory DSA 2826-1 (denyhosts - Remote denial of ssh service) | 22 Dec 201300:00 | – | openvas |
![]() | Gentoo Security Advisory GLSA 201406-23 | 29 Sep 201500:00 | – | openvas |
![]() | Fedora Update for denyhosts FEDORA-2014-17081 | 5 Jan 201500:00 | – | openvas |
![]() | Debian: Security Advisory (DSA-2826-1) | 21 Dec 201300:00 | – | openvas |
![]() | GLSA-201406-23 : DenyHosts: Denial of Service | 26 Jun 201400:00 | – | nessus |
#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DSA-2826. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(71586);
script_version("1.9");
script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/11");
script_cve_id("CVE-2013-6890");
script_bugtraq_id(64478);
script_xref(name:"DSA", value:"2826");
script_name(english:"Debian DSA-2826-1 : denyhosts - remote denial of ssh service");
script_summary(english:"Checks dpkg output for the updated package");
script_set_attribute(
attribute:"synopsis",
value:"The remote Debian host is missing a security-related update."
);
script_set_attribute(
attribute:"description",
value:
"Helmut Grohne discovered that denyhosts, a tool preventing SSH
brute-force attacks, could be used to perform remote denial of service
against the SSH daemon. Incorrectly specified regular expressions used
to detect brute-force attacks in authentication logs could be
exploited by a malicious user to forge crafted login names in order to
make denyhosts ban arbitrary IP addresses."
);
script_set_attribute(
attribute:"see_also",
value:"https://packages.debian.org/source/squeeze/denyhosts"
);
script_set_attribute(
attribute:"see_also",
value:"https://packages.debian.org/source/wheezy/denyhosts"
);
script_set_attribute(
attribute:"see_also",
value:"https://www.debian.org/security/2013/dsa-2826"
);
script_set_attribute(
attribute:"solution",
value:
"Upgrade the denyhosts packages.
For the oldstable distribution (squeeze), this problem has been fixed
in version 2.6-7+deb6u2.
For the stable distribution (wheezy), this problem has been fixed in
version 2.6-10+deb7u2."
);
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:denyhosts");
script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:6.0");
script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:7.0");
script_set_attribute(attribute:"patch_publication_date", value:"2013/12/22");
script_set_attribute(attribute:"plugin_publication_date", value:"2013/12/23");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2013-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_family(english:"Debian Local Security Checks");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l");
exit(0);
}
include("audit.inc");
include("debian_package.inc");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/release")) audit(AUDIT_OS_NOT, "Debian");
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);
flag = 0;
if (deb_check(release:"6.0", prefix:"denyhosts", reference:"2.6-7+deb6u2")) flag++;
if (deb_check(release:"7.0", prefix:"denyhosts", reference:"2.6-10+deb7u2")) flag++;
if (flag)
{
if (report_verbosity > 0) security_warning(port:0, extra:deb_report_get());
else security_warning(0);
exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");
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