The Linux kernel before 4.4.1 allows local users to bypass file-descriptor limits and cause a denial of service (memory consumption) by sending each descriptor over a UNIX socket before closing it, related to net/unix/af_unix.c and net/unix/garbage.c.
(CVE-2013-4312)
A race condition in the tty_ioctl function in drivers/tty/tty_io.c in the Linux kernel through 4.4.1 was found that allows local users to obtain sensitive information from kernel memory or cause a denial of service (use-after-free and system crash) by making a TIOCGETD ioctl call during processing of a TIOCSETD ioctl call. (CVE-2016-0723)
A privilege-escalation vulnerability was discovered in the Linux kernel built with User Namespace (CONFIG_USER_NS) support. The flaw occurred when the ptrace() system call was used on a root-owned process to enter a user namespace. A privileged namespace user could exploit this flaw to potentially escalate their privileges on the system, outside the original namespace. (CVE-2015-8709)
net/sctp/sm_sideeffect.c in the Linux kernel before 4.3 does not properly manage the relationship between a lock and a socket, which allows local users to cause a denial of service (deadlock) via a crafted sctp_accept call. (CVE-2015-8767)
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux AMI Security Advisory ALAS-2016-648.
#
include("compat.inc");
if (description)
{
script_id(88660);
script_version("2.6");
script_cvs_date("Date: 2018/09/04 13:20:07");
script_cve_id("CVE-2013-4312", "CVE-2015-8709", "CVE-2015-8767", "CVE-2016-0723");
script_xref(name:"ALAS", value:"2016-648");
script_name(english:"Amazon Linux AMI : kernel (ALAS-2016-648)");
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:
"The Linux kernel before 4.4.1 allows local users to bypass
file-descriptor limits and cause a denial of service (memory
consumption) by sending each descriptor over a UNIX socket before
closing it, related to net/unix/af_unix.c and net/unix/garbage.c.
(CVE-2013-4312)
A race condition in the tty_ioctl function in drivers/tty/tty_io.c in
the Linux kernel through 4.4.1 was found that allows local users to
obtain sensitive information from kernel memory or cause a denial of
service (use-after-free and system crash) by making a TIOCGETD ioctl
call during processing of a TIOCSETD ioctl call. (CVE-2016-0723)
A privilege-escalation vulnerability was discovered in the Linux
kernel built with User Namespace (CONFIG_USER_NS) support. The flaw
occurred when the ptrace() system call was used on a root-owned
process to enter a user namespace. A privileged namespace user could
exploit this flaw to potentially escalate their privileges on the
system, outside the original namespace. (CVE-2015-8709)
net/sctp/sm_sideeffect.c in the Linux kernel before 4.3 does not
properly manage the relationship between a lock and a socket, which
allows local users to cause a denial of service (deadlock) via a
crafted sctp_accept call. (CVE-2015-8767)"
);
script_set_attribute(
attribute:"see_also",
value:"https://alas.aws.amazon.com/ALAS-2016-648.html"
);
script_set_attribute(
attribute:"solution",
value:
"Run 'yum clean all' followed by 'yum update kernel' to update your
system. You will need to reboot your system in order for the new
kernel to be running."
);
script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:C/I:C/A:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:L/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:amazon:linux:kernel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-debuginfo-common-i686");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-debuginfo-common-x86_64");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-doc");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-headers");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-tools");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-tools-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-tools-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:perf");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:perf-debuginfo");
script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux");
script_set_attribute(attribute:"patch_publication_date", value:"2016/02/09");
script_set_attribute(attribute:"plugin_publication_date", value:"2016/02/10");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2016-2018 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:"kernel-4.1.17-22.30.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"kernel-debuginfo-4.1.17-22.30.amzn1")) flag++;
if (rpm_check(release:"ALA", cpu:"i686", reference:"kernel-debuginfo-common-i686-4.1.17-22.30.amzn1")) flag++;
if (rpm_check(release:"ALA", cpu:"x86_64", reference:"kernel-debuginfo-common-x86_64-4.1.17-22.30.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"kernel-devel-4.1.17-22.30.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"kernel-doc-4.1.17-22.30.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"kernel-headers-4.1.17-22.30.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"kernel-tools-4.1.17-22.30.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"kernel-tools-debuginfo-4.1.17-22.30.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"kernel-tools-devel-4.1.17-22.30.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"perf-4.1.17-22.30.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"perf-debuginfo-4.1.17-22.30.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, "kernel / kernel-debuginfo / kernel-debuginfo-common-i686 / etc");
}
Vendor | Product | Version | CPE |
---|---|---|---|
amazon | linux | kernel | p-cpe:/a:amazon:linux:kernel |
amazon | linux | kernel-debuginfo | p-cpe:/a:amazon:linux:kernel-debuginfo |
amazon | linux | kernel-debuginfo-common-i686 | p-cpe:/a:amazon:linux:kernel-debuginfo-common-i686 |
amazon | linux | kernel-debuginfo-common-x86_64 | p-cpe:/a:amazon:linux:kernel-debuginfo-common-x86_64 |
amazon | linux | kernel-devel | p-cpe:/a:amazon:linux:kernel-devel |
amazon | linux | kernel-doc | p-cpe:/a:amazon:linux:kernel-doc |
amazon | linux | kernel-headers | p-cpe:/a:amazon:linux:kernel-headers |
amazon | linux | kernel-tools | p-cpe:/a:amazon:linux:kernel-tools |
amazon | linux | kernel-tools-debuginfo | p-cpe:/a:amazon:linux:kernel-tools-debuginfo |
amazon | linux | kernel-tools-devel | p-cpe:/a:amazon:linux:kernel-tools-devel |