An update for kernel-rt is now available for Red Hat Enterprise Linux 7.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.
Security Fix(es) :
Linux kernel built with the Kernel-based Virtual Machine (CONFIG_KVM) support is vulnerable to a NULL pointer dereference flaw.
It could occur on x86 platform, when emulating an undefined instruction. An attacker could use this flaw to crash the host kernel resulting in DoS. (CVE-2016-8630, Important)
A race condition issue leading to a use-after-free flaw was found in the way the raw packet sockets implementation in the Linux kernel networking subsystem handled synchronization while creating the TPACKET_V3 ring buffer. A local user able to open a raw packet socket (requires the CAP_NET_RAW capability) could use this flaw to elevate their privileges on the system. (CVE-2016-8655, Important)
A flaw was discovered in the Linux kernel’s implementation of VFIO.
An attacker issuing an ioctl can create a situation where memory is corrupted and modify memory outside of the expected area. This may overwrite kernel memory and subvert kernel execution. (CVE-2016-9083, Important)
The use of a kzalloc with an integer multiplication allowed an integer overflow condition to be reached in vfio_pci_intrs.c. This combined with CVE-2016-9083 may allow an attacker to craft an attack and use unallocated memory, potentially crashing the machine.
(CVE-2016-9084, Moderate)
Red Hat would like to thank Philip Pettersson for reporting CVE-2016-8655.
Bug Fix(es) :
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2017:0387. The text
# itself is copyright (C) Red Hat, Inc.
#
include("compat.inc");
if (description)
{
script_id(97510);
script_version("3.11");
script_cvs_date("Date: 2019/10/24 15:35:42");
script_cve_id("CVE-2016-8630", "CVE-2016-8655", "CVE-2016-9083", "CVE-2016-9084");
script_xref(name:"RHSA", value:"2017:0387");
script_name(english:"RHEL 7 : kernel-rt (RHSA-2017:0387)");
script_summary(english:"Checks the rpm output for the updated packages");
script_set_attribute(
attribute:"synopsis",
value:"The remote Red Hat host is missing one or more security updates."
);
script_set_attribute(
attribute:"description",
value:
"An update for kernel-rt is now available for Red Hat Enterprise Linux
7.
Red Hat Product Security has rated this update as having a security
impact of Important. A Common Vulnerability Scoring System (CVSS) base
score, which gives a detailed severity rating, is available for each
vulnerability from the CVE link(s) in the References section.
The kernel-rt packages provide the Real Time Linux Kernel, which
enables fine-tuning for systems with extremely high determinism
requirements.
Security Fix(es) :
* Linux kernel built with the Kernel-based Virtual Machine
(CONFIG_KVM) support is vulnerable to a NULL pointer dereference flaw.
It could occur on x86 platform, when emulating an undefined
instruction. An attacker could use this flaw to crash the host kernel
resulting in DoS. (CVE-2016-8630, Important)
* A race condition issue leading to a use-after-free flaw was found in
the way the raw packet sockets implementation in the Linux kernel
networking subsystem handled synchronization while creating the
TPACKET_V3 ring buffer. A local user able to open a raw packet socket
(requires the CAP_NET_RAW capability) could use this flaw to elevate
their privileges on the system. (CVE-2016-8655, Important)
* A flaw was discovered in the Linux kernel's implementation of VFIO.
An attacker issuing an ioctl can create a situation where memory is
corrupted and modify memory outside of the expected area. This may
overwrite kernel memory and subvert kernel execution. (CVE-2016-9083,
Important)
* The use of a kzalloc with an integer multiplication allowed an
integer overflow condition to be reached in vfio_pci_intrs.c. This
combined with CVE-2016-9083 may allow an attacker to craft an attack
and use unallocated memory, potentially crashing the machine.
(CVE-2016-9084, Moderate)
Red Hat would like to thank Philip Pettersson for reporting
CVE-2016-8655.
Bug Fix(es) :
* Previously, the asynchronous page fault woke code references
spinlocks, which were actually sleeping locks in the RT kernel.
Because of this, when the code was executed from the exception
context, a bug warning appeared on the console. With this update, the
regular wait queue and spinlock code in this area has been modified to
use simple-wait-queue and raw-spinlocks. This code change enables the
asynchronous page fault code to run in a non-preemptable state without
bug warnings. (BZ#1418035)"
);
script_set_attribute(
attribute:"see_also",
value:"https://access.redhat.com/errata/RHSA-2017:0387"
);
script_set_attribute(
attribute:"see_also",
value:"https://access.redhat.com/security/cve/cve-2016-8630"
);
script_set_attribute(
attribute:"see_also",
value:"https://access.redhat.com/security/cve/cve-2016-8655"
);
script_set_attribute(
attribute:"see_also",
value:"https://access.redhat.com/security/cve/cve-2016-9083"
);
script_set_attribute(
attribute:"see_also",
value:"https://access.redhat.com/security/cve/cve-2016-9084"
);
script_set_attribute(attribute:"solution", value:"Update the affected packages.");
script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
script_set_cvss_temporal_vector("CVSS2#E:H/RL:OF/RC: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_cvss3_temporal_vector("CVSS:3.0/E:H/RL:O/RC:C");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"exploit_framework_core", value:"true");
script_set_attribute(attribute:"exploited_by_malware", value:"true");
script_set_attribute(attribute:"metasploit_name", value:'AF_PACKET chocobo_root Privilege Escalation');
script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-kvm");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-kvm-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-debuginfo-common-x86_64");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-doc");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-kvm");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-kvm-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-trace");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-trace-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-trace-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-trace-kvm");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-trace-kvm-debuginfo");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7");
script_set_attribute(attribute:"vuln_publication_date", value:"2016/11/28");
script_set_attribute(attribute:"patch_publication_date", value:"2017/03/02");
script_set_attribute(attribute:"plugin_publication_date", value:"2017/03/03");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_family(english:"Red Hat Local Security Checks");
script_dependencies("ssh_get_info.nasl", "linux_alt_patch_detect.nasl");
script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/cpu");
exit(0);
}
include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");
include("rpm.inc");
include("ksplice.inc");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/RedHat/release");
if (isnull(release) || "Red Hat" >!< release) audit(AUDIT_OS_NOT, "Red Hat");
os_ver = pregmatch(pattern: "Red Hat Enterprise Linux.*release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Red Hat");
os_ver = os_ver[1];
if (! preg(pattern:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Red Hat 7.x", "Red Hat " + os_ver);
if (!get_kb_item("Host/RedHat/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$" && "s390" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Red Hat", cpu);
if (get_one_kb_item("Host/ksplice/kernel-cves"))
{
rm_kb_item(name:"Host/uptrack-uname-r");
cve_list = make_list("CVE-2016-8630", "CVE-2016-8655", "CVE-2016-9083", "CVE-2016-9084");
if (ksplice_cves_check(cve_list))
{
audit(AUDIT_PATCH_INSTALLED, "KSplice hotfix for RHSA-2017:0387");
}
else
{
__rpm_report = ksplice_reporting_text();
}
}
yum_updateinfo = get_kb_item("Host/RedHat/yum-updateinfo");
if (!empty_or_null(yum_updateinfo))
{
rhsa = "RHSA-2017:0387";
yum_report = redhat_generate_yum_updateinfo_report(rhsa:rhsa);
if (!empty_or_null(yum_report))
{
security_report_v4(
port : 0,
severity : SECURITY_HOLE,
extra : yum_report
);
exit(0);
}
else
{
audit_message = "affected by Red Hat security advisory " + rhsa;
audit(AUDIT_OS_NOT, audit_message);
}
}
else
{
flag = 0;
if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-3.10.0-514.10.2.rt56.435.el7")) flag++;
if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-debug-3.10.0-514.10.2.rt56.435.el7")) flag++;
if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-debug-debuginfo-3.10.0-514.10.2.rt56.435.el7")) flag++;
if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-debug-devel-3.10.0-514.10.2.rt56.435.el7")) flag++;
if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-debug-kvm-3.10.0-514.10.2.rt56.435.el7")) flag++;
if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-debug-kvm-debuginfo-3.10.0-514.10.2.rt56.435.el7")) flag++;
if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-debuginfo-3.10.0-514.10.2.rt56.435.el7")) flag++;
if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-debuginfo-common-x86_64-3.10.0-514.10.2.rt56.435.el7")) flag++;
if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-devel-3.10.0-514.10.2.rt56.435.el7")) flag++;
if (rpm_check(release:"RHEL7", reference:"kernel-rt-doc-3.10.0-514.10.2.rt56.435.el7")) flag++;
if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-kvm-3.10.0-514.10.2.rt56.435.el7")) flag++;
if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-kvm-debuginfo-3.10.0-514.10.2.rt56.435.el7")) flag++;
if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-trace-3.10.0-514.10.2.rt56.435.el7")) flag++;
if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-trace-debuginfo-3.10.0-514.10.2.rt56.435.el7")) flag++;
if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-trace-devel-3.10.0-514.10.2.rt56.435.el7")) flag++;
if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-trace-kvm-3.10.0-514.10.2.rt56.435.el7")) flag++;
if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-trace-kvm-debuginfo-3.10.0-514.10.2.rt56.435.el7")) flag++;
if (flag)
{
security_report_v4(
port : 0,
severity : SECURITY_HOLE,
extra : rpm_report_get() + redhat_report_package_caveat()
);
exit(0);
}
else
{
tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, "kernel-rt / kernel-rt-debug / kernel-rt-debug-debuginfo / etc");
}
}
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8630
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8655
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-9083
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-9084
access.redhat.com/errata/RHSA-2017:0387
access.redhat.com/security/cve/cve-2016-8630
access.redhat.com/security/cve/cve-2016-8655
access.redhat.com/security/cve/cve-2016-9083
access.redhat.com/security/cve/cve-2016-9084