7.2 High
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
5.5 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
0.001 Low
EPSS
Percentile
50.2%
When running as a Xen 64-bit PV guest, user mode processes not supposed to be able to access I/O ports may be granted such permission, potentially resulting in one or more of in-guest privilege escalation, guest crashes (Denial of Service), or in-guest information leaks. (CVE-2016-3157)
In some cases, the kernel did not correctly fix backward jumps in a new eBPF program, which could allow arbitrary reads. (CVE-2016-2383)
The kernel incorrectly accounted for the number of in-flight fds over a unix domain socket to the original opener of the file descriptor.
Another process could arbitrarily deplete the original file opener’s maximum open files resource limit. (CVE-2016-2550)
A resource-exhaustion vulnerability was found in the kernel, where an unprivileged process could allocate and accumulate far more file descriptors than the process’ limit. A local, unauthenticated user could exploit this flaw by sending file descriptors over a Unix socket and then closing them to keep the process’ fd count low, thereby creating kernel-memory or file-descriptors exhaustion (denial of service). (CVE-2016-2847)
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux AMI Security Advisory ALAS-2016-669.
#
include("compat.inc");
if (description)
{
script_id(89966);
script_version("2.5");
script_cvs_date("Date: 2018/04/18 15:09:35");
script_cve_id("CVE-2016-2383", "CVE-2016-2550", "CVE-2016-2847", "CVE-2016-3157");
script_xref(name:"ALAS", value:"2016-669");
script_name(english:"Amazon Linux AMI : kernel (ALAS-2016-669)");
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:
"When running as a Xen 64-bit PV guest, user mode processes not
supposed to be able to access I/O ports may be granted such
permission, potentially resulting in one or more of in-guest privilege
escalation, guest crashes (Denial of Service), or in-guest information
leaks. (CVE-2016-3157)
In some cases, the kernel did not correctly fix backward jumps in a
new eBPF program, which could allow arbitrary reads. (CVE-2016-2383)
The kernel incorrectly accounted for the number of in-flight fds over
a unix domain socket to the original opener of the file descriptor.
Another process could arbitrarily deplete the original file opener's
maximum open files resource limit. (CVE-2016-2550)
A resource-exhaustion vulnerability was found in the kernel, where an
unprivileged process could allocate and accumulate far more file
descriptors than the process' limit. A local, unauthenticated user
could exploit this flaw by sending file descriptors over a Unix socket
and then closing them to keep the process' fd count low, thereby
creating kernel-memory or file-descriptors exhaustion (denial of
service). (CVE-2016-2847)"
);
script_set_attribute(
attribute:"see_also",
value:"https://alas.aws.amazon.com/ALAS-2016-669.html"
);
script_set_attribute(
attribute:"solution",
value:"Run 'yum update kernel' to update your system."
);
script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/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:"2016/03/16");
script_set_attribute(attribute:"plugin_publication_date", value:"2016/03/17");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2016-2018 Tenable Network Security, Inc.");
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-4.1.19-24.31.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"kernel-debuginfo-4.1.19-24.31.amzn1")) flag++;
if (rpm_check(release:"ALA", cpu:"i686", reference:"kernel-debuginfo-common-i686-4.1.19-24.31.amzn1")) flag++;
if (rpm_check(release:"ALA", cpu:"x86_64", reference:"kernel-debuginfo-common-x86_64-4.1.19-24.31.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"kernel-devel-4.1.19-24.31.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"kernel-doc-4.1.19-24.31.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"kernel-headers-4.1.19-24.31.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"kernel-tools-4.1.19-24.31.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"kernel-tools-debuginfo-4.1.19-24.31.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"kernel-tools-devel-4.1.19-24.31.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"perf-4.1.19-24.31.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"perf-debuginfo-4.1.19-24.31.amzn1")) flag++;
if (flag)
{
if (report_verbosity > 0) security_hole(port:0, extra:rpm_report_get());
else security_hole(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 |
7.2 High
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
5.5 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
0.001 Low
EPSS
Percentile
50.2%