It was discovered that systemd-network does not correctly keep track of a buffer size when constructing DHCPv6 packets. This flaw may lead to an integer underflow that can be used to produce an heap-based buffer overflow. A malicious host on the same network segment as the victim’s one may advertise itself as a DHCPv6 server and exploit this flaw to cause a Denial of Service or potentially gain code execution on the victim’s machine.(CVE-2018-15688)
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux 2 Security Advisory ALAS-2019-1144.
#
include("compat.inc");
if (description)
{
script_id(121053);
script_version("1.3");
script_set_attribute(attribute:"plugin_modification_date", value:"2022/02/02");
script_cve_id("CVE-2018-15688");
script_xref(name:"ALAS", value:"2019-1144");
script_name(english:"Amazon Linux 2 : NetworkManager (ALAS-2019-1144)");
script_summary(english:"Checks rpm output for the updated packages");
script_set_attribute(
attribute:"synopsis",
value:"The remote Amazon Linux 2 host is missing a security update."
);
script_set_attribute(
attribute:"description",
value:
"It was discovered that systemd-network does not correctly keep track
of a buffer size when constructing DHCPv6 packets. This flaw may lead
to an integer underflow that can be used to produce an heap-based
buffer overflow. A malicious host on the same network segment as the
victim's one may advertise itself as a DHCPv6 server and exploit this
flaw to cause a Denial of Service or potentially gain code execution
on the victim's machine.(CVE-2018-15688)"
);
script_set_attribute(
attribute:"see_also",
value:"https://alas.aws.amazon.com/AL2/ALAS-2019-1144.html"
);
script_set_attribute(
attribute:"solution",
value:"Run 'yum update NetworkManager' to update your system."
);
script_set_cvss_base_vector("CVSS2#AV:A/AC:L/Au:N/C:P/I:P/A:P");
script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2018-15688");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"exploit_available", value:"false");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:NetworkManager");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:NetworkManager-adsl");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:NetworkManager-bluetooth");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:NetworkManager-config-server");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:NetworkManager-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:NetworkManager-dispatcher-routing-rules");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:NetworkManager-glib");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:NetworkManager-glib-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:NetworkManager-libnm");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:NetworkManager-libnm-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:NetworkManager-ppp");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:NetworkManager-team");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:NetworkManager-tui");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:NetworkManager-wifi");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:NetworkManager-wwan");
script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux:2");
script_set_attribute(attribute:"vuln_publication_date", value:"2018/10/26");
script_set_attribute(attribute:"patch_publication_date", value:"2019/01/07");
script_set_attribute(attribute:"plugin_publication_date", value:"2019/01/10");
script_set_attribute(attribute:"in_the_news", value:"true");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2019-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_family(english:"Amazon Linux Local Security Checks");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/AmazonLinux/release", "Host/AmazonLinux/rpm-list");
exit(0);
}
include("audit.inc");
include("global_settings.inc");
include("rpm.inc");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/AmazonLinux/release");
if (isnull(release) || !strlen(release)) audit(AUDIT_OS_NOT, "Amazon Linux");
os_ver = pregmatch(pattern: "^AL(A|\d)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Amazon Linux");
os_ver = os_ver[1];
if (os_ver != "2")
{
if (os_ver == 'A') os_ver = 'AMI';
audit(AUDIT_OS_NOT, "Amazon Linux 2", "Amazon Linux " + os_ver);
}
if (!get_kb_item("Host/AmazonLinux/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
flag = 0;
if (rpm_check(release:"AL2", reference:"NetworkManager-1.12.0-8.amzn2.0.2")) flag++;
if (rpm_check(release:"AL2", reference:"NetworkManager-adsl-1.12.0-8.amzn2.0.2")) flag++;
if (rpm_check(release:"AL2", reference:"NetworkManager-bluetooth-1.12.0-8.amzn2.0.2")) flag++;
if (rpm_check(release:"AL2", reference:"NetworkManager-config-server-1.12.0-8.amzn2.0.2")) flag++;
if (rpm_check(release:"AL2", reference:"NetworkManager-debuginfo-1.12.0-8.amzn2.0.2")) flag++;
if (rpm_check(release:"AL2", reference:"NetworkManager-dispatcher-routing-rules-1.12.0-8.amzn2.0.2")) flag++;
if (rpm_check(release:"AL2", reference:"NetworkManager-glib-1.12.0-8.amzn2.0.2")) flag++;
if (rpm_check(release:"AL2", reference:"NetworkManager-glib-devel-1.12.0-8.amzn2.0.2")) flag++;
if (rpm_check(release:"AL2", reference:"NetworkManager-libnm-1.12.0-8.amzn2.0.2")) flag++;
if (rpm_check(release:"AL2", reference:"NetworkManager-libnm-devel-1.12.0-8.amzn2.0.2")) flag++;
if (rpm_check(release:"AL2", reference:"NetworkManager-ppp-1.12.0-8.amzn2.0.2")) flag++;
if (rpm_check(release:"AL2", reference:"NetworkManager-team-1.12.0-8.amzn2.0.2")) flag++;
if (rpm_check(release:"AL2", reference:"NetworkManager-tui-1.12.0-8.amzn2.0.2")) flag++;
if (rpm_check(release:"AL2", reference:"NetworkManager-wifi-1.12.0-8.amzn2.0.2")) flag++;
if (rpm_check(release:"AL2", reference:"NetworkManager-wwan-1.12.0-8.amzn2.0.2")) flag++;
if (flag)
{
if (report_verbosity > 0) security_warning(port:0, extra:rpm_report_get());
else security_warning(0);
exit(0);
}
else
{
tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, "NetworkManager / NetworkManager-adsl / NetworkManager-bluetooth / etc");
}