Sending SIGKILL to other processes with root privileges via su :
A race condition was found in the way su handled the management of child processes. A local authenticated attacker could use this flaw to kill other processes with root privileges under specific conditions.(CVE-2017-2616)
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux AMI Security Advisory ALAS-2017-823.
#
include("compat.inc");
if (description)
{
script_id(99711);
script_version("3.3");
script_cvs_date("Date: 2018/09/24 9:27:18");
script_cve_id("CVE-2017-2616");
script_xref(name:"ALAS", value:"2017-823");
script_name(english:"Amazon Linux AMI : util-linux (ALAS-2017-823)");
script_summary(english:"Checks rpm output for the updated packages");
script_set_attribute(
attribute:"synopsis",
value:"The remote Amazon Linux AMI host is missing a security update."
);
script_set_attribute(
attribute:"description",
value:
"Sending SIGKILL to other processes with root privileges via su :
A race condition was found in the way su handled the management of
child processes. A local authenticated attacker could use this flaw to
kill other processes with root privileges under specific
conditions.(CVE-2017-2616)"
);
script_set_attribute(
attribute:"see_also",
value:"https://alas.aws.amazon.com/ALAS-2017-823.html"
);
script_set_attribute(
attribute:"solution",
value:"Run 'yum update util-linux' to update your system."
);
script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:N/I:N/A:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libblkid");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libblkid-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libmount");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libmount-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libuuid");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libuuid-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:util-linux");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:util-linux-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:uuidd");
script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux");
script_set_attribute(attribute:"patch_publication_date", value:"2017/04/27");
script_set_attribute(attribute:"plugin_publication_date", value:"2017/04/28");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2017-2018 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 != "A")
{
if (os_ver == 'A') os_ver = 'AMI';
audit(AUDIT_OS_NOT, "Amazon Linux AMI", "Amazon Linux " + os_ver);
}
if (!get_kb_item("Host/AmazonLinux/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
flag = 0;
if (rpm_check(release:"ALA", reference:"libblkid-2.23.2-33.28.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"libblkid-devel-2.23.2-33.28.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"libmount-2.23.2-33.28.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"libmount-devel-2.23.2-33.28.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"libuuid-2.23.2-33.28.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"libuuid-devel-2.23.2-33.28.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"util-linux-2.23.2-33.28.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"util-linux-debuginfo-2.23.2-33.28.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"uuidd-2.23.2-33.28.amzn1")) 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, "libblkid / libblkid-devel / libmount / libmount-devel / libuuid / etc");
}
Vendor | Product | Version | CPE |
---|---|---|---|
amazon | linux | libblkid | p-cpe:/a:amazon:linux:libblkid |
amazon | linux | libblkid-devel | p-cpe:/a:amazon:linux:libblkid-devel |
amazon | linux | libmount | p-cpe:/a:amazon:linux:libmount |
amazon | linux | libmount-devel | p-cpe:/a:amazon:linux:libmount-devel |
amazon | linux | libuuid | p-cpe:/a:amazon:linux:libuuid |
amazon | linux | libuuid-devel | p-cpe:/a:amazon:linux:libuuid-devel |
amazon | linux | util-linux | p-cpe:/a:amazon:linux:util-linux |
amazon | linux | util-linux-debuginfo | p-cpe:/a:amazon:linux:util-linux-debuginfo |
amazon | linux | uuidd | p-cpe:/a:amazon:linux:uuidd |
amazon | linux | cpe:/o:amazon:linux |