The remote host is affected by the vulnerability described in GLSA-201612-39 (Bash: Arbitrary code execution)
A vulnerability was found in the way Bash expands $HOSTNAME. Injecting malicious code into $HOSTNAME could cause it to run each time Bash expands \\h in the prompt string.
Impact :
A remote attacker controlling the system’s hostname (i.e. via DHCP) could possibly execute arbitrary code with the privileges of the process, or cause a Denial of Service condition.
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 201612-39.
#
# The advisory text is Copyright (C) 2001-2018 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(95742);
script_version("3.4");
script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/11");
script_cve_id("CVE-2016-0634");
script_xref(name:"GLSA", value:"201612-39");
script_name(english:"GLSA-201612-39 : Bash: Arbitrary code execution");
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-201612-39
(Bash: Arbitrary code execution)
A vulnerability was found in the way Bash expands $HOSTNAME. Injecting
malicious code into $HOSTNAME could cause it to run each time Bash
expands \\h in the prompt string.
Impact :
A remote attacker controlling the system’s hostname (i.e. via DHCP)
could possibly execute arbitrary code with the privileges of the process,
or cause a Denial of
Service condition.
Workaround :
There is no known workaround at this time."
);
script_set_attribute(
attribute:"see_also",
value:"https://security.gentoo.org/glsa/201612-39"
);
script_set_attribute(
attribute:"solution",
value:
"All Bash users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose '>=app-shells/bash-4.3_p46-r1'"
);
script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:S/C:P/I:P/A:P");
script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:gentoo:linux:bash");
script_set_attribute(attribute:"cpe", value:"cpe:/o:gentoo:linux");
script_set_attribute(attribute:"patch_publication_date", value:"2016/12/13");
script_set_attribute(attribute:"plugin_publication_date", value:"2016/12/13");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2016-2021 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-shells/bash", unaffected:make_list("ge 4.3_p46-r1"), vulnerable:make_list("lt 4.3_p46-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, "Bash");
}