The remote host has not properly mitigated a series of known speculative execution vulnerabilities. It, therefore, may be affected by :
  - Branch Target Injection (BTI) (CVE-2017-5715)
  - Bounds Check Bypass (BCB) (CVE-2017-5753)
  - Rogue Data Cache Load (RDCL) (CVE-2017-5754)
  - Rogue System Register Read (RSRE) (CVE-2018-3640)
  - Speculative Store Bypass (SSB) (CVE-2018-3639)
  - L1 Terminal Fault (L1TF) (CVE-2018-3615, CVE-2018-3620, CVE-2018-3646)
  - Microarchitectural Data Sampling Uncacheable Memory (MDSUM) (CVE-2019-11091)
  - Microarchitectural Store Buffer Data Sampling (MSBDS) (CVE-2018-12126)
  - Microarchitectural Load Port Data Sampling (MLPDS) (CVE-2018-12127)
  - Microarchitectural Fill Buffer Data Sampling (MFBDS) (CVE-2018-12130)
  - TSX Asynchronous Abort (TAA) (CVE-2019-11135)

An update for kernel 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 packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es) :

* Modern operating systems implement virtualization of physical memory to efficiently use available system resources and provide inter-domain protection through access control and isolation. The L1TF issue was found in the way the x86 microprocessor designs have implemented speculative execution of instructions (a commonly used performance optimisation) in combination with handling of page-faults caused by terminated virtual to physical address resolving process. As a result, an unprivileged attacker could use this flaw to read privileged memory of the kernel or other processes and/or cross guest/host boundaries to read host memory by conducting targeted cache side-channel attacks.
(CVE-2018-3620, CVE-2018-3646)

* An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of instructions past bounds check. The flaw relies on the presence of a precisely-defined instruction sequence in the privileged code and the fact that memory writes occur to an address which depends on the untrusted value. Such writes cause an update into the microprocessor's data cache even for speculatively executed instructions that never actually commit (retire). As a result, an unprivileged attacker could use this flaw to influence speculative execution and/or read privileged memory by conducting targeted cache side-channel attacks.
(CVE-2018-3693)

* A flaw named SegmentSmack was found in the way the Linux kernel handled specially crafted TCP packets. A remote attacker could use this flaw to trigger time and calculation expensive calls to tcp_collapse_ofo_queue() and tcp_prune_ofo_queue() functions by sending specially modified packets within ongoing TCP sessions which could lead to a CPU saturation and hence a denial of service on the system. Maintaining the denial of service condition requires continuous two-way TCP sessions to a reachable open port, thus the attacks cannot be performed using spoofed IP addresses.
(CVE-2018-5390)

* kernel: crypto: privilege escalation in skcipher_recvmsg function (CVE-2017-13215)

* kernel: mm: use-after-free in do_get_mempolicy function allows local DoS or other unspecified impact (CVE-2018-10675)

* kernel: race condition in snd_seq_write() may lead to UAF or OOB access (CVE-2018-7566)

For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.

Red Hat would like to thank Intel OSSIRT (Intel.com) for reporting CVE-2018-3620 and CVE-2018-3646; Vladimir Kiriansky (MIT) and Carl Waldspurger (Carl Waldspurger Consulting) for reporting CVE-2018-3693;
and Juha-Matti Tilli (Aalto University, Department of Communications and Networking and Nokia Bell Labs) for reporting CVE-2018-5390.

Bug Fix(es) :

These updated kernel packages include also numerous bug fixes. Space precludes documenting all of the bug fixes in this advisory. See the descriptions in the related Knowledge Article :

https://access.redhat.com/articles/3527791

The SUSE Linux Enterprise 12 SP3 Azure kernel was updated to 4.4.143 to receive various security and bugfixes. The following security bugs were fixed :

  - CVE-2018-3620: Local attackers on baremetal systems     could use speculative code patterns on hyperthreaded     processors to read data present in the L1 Datacache used     by other hyperthreads on the same CPU core, potentially     leaking sensitive data. (bnc#1087081).

  - CVE-2018-3646: Local attackers in virtualized guest     systems could use speculative code patterns on     hyperthreaded processors to read data present in the L1     Datacache used by other hyperthreads on the same CPU     core, potentially leaking sensitive data, even from     other virtual machines or the host system.
    (bnc#1089343).

  - CVE-2018-5391: A flaw in the IP packet reassembly could     be used by remote attackers to consume CPU time     (bnc#1103097).

  - CVE-2018-5390: Linux kernel versions 4.9+ can be forced     to make very expensive calls to tcp_collapse_ofo_queue()     and tcp_prune_ofo_queue() for every incoming packet     which can lead to a denial of service (bnc#1102340).

  - CVE-2018-14734: drivers/infiniband/core/ucma.c allowed     ucma_leave_multicast to access a certain data structure     after a cleanup step in ucma_process_join, which allowed     attackers to cause a denial of service (use-after-free)     (bnc#1103119).

  - CVE-2017-18344: The timer_create syscall implementation     in kernel/time/posix-timers.c didn't properly validate     the sigevent->sigev_notify field, which leads to     out-of-bounds access in the show_timer function (called     when /proc/$PID/timers is read). This allowed userspace     applications to read arbitrary kernel memory (on a     kernel built with CONFIG_POSIX_TIMERS and     CONFIG_CHECKPOINT_RESTORE) (bnc#1102851 1103580).

The update package also includes non-security fixes. See advisory for details.

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Oracle Linux 5 / 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2018-4214 advisory.

    - x86/speculation/l1tf: Fix overflow in l1tf_pfn_limit() on 32bit (Vlastimil Babka)  [Orabug: 28505519]     {CVE-2018-3620}
    - x86/speculation/l1tf: Exempt zeroed PTEs from inversion (Sean Christopherson)  [Orabug: 28505519]     {CVE-2018-3620}
    - x86/speculation/l1tf: Protect PAE swap entries against L1TF (Vlastimil Babka)  [Orabug: 28505519]     {CVE-2018-3620}
    - x86/speculation/l1tf: Extend 64bit swap file size limit (Vlastimil Babka)  [Orabug: 28505519]     {CVE-2018-3620}
    - mm, fremap: mitigate L1TF in remap_file_pages (Daniel Jordan)  [Orabug: 28505519]  {CVE-2018-3620}
    - x86/speculation: Don't mark cpu_no_l1tf __initconst (Boris Ostrovsky)  [Orabug: 28505519]     {CVE-2018-3620}
    - x86/mm/kmmio: Make the tracer robust against L1TF (Andi Kleen)  [Orabug: 28505519]  {CVE-2018-3620}
    - x86/speculation/l1tf: Make pmd/pud_mknotpresent() invert (Andi Kleen)  [Orabug: 28505519]     {CVE-2018-3620}
    - x86/speculation/l1tf: Invert all not present mappings (Andi Kleen)  [Orabug: 28505519]  {CVE-2018-3620}
    - x86/bugs: Move the l1tf function and define pr_fmt properly (Konrad Rzeszutek Wilk)  [Orabug: 28505519]     {CVE-2018-3620}
    - x86/speculation/l1tf: Limit swap file size to MAX_PA/2 (Andi Kleen)  [Orabug: 28505519]  {CVE-2018-3620}
    - x86/speculation/l1tf: Disallow non privileged high MMIO PROT_NONE mappings (Andi Kleen)  [Orabug:
    28505519]  {CVE-2018-3620}
    - mm/pagewalk.c: prevent positive return value of walk_page_test() from being passed to callers (Naoya     Horiguchi)  [Orabug: 28505519]  {CVE-2018-3620}
    - mm: pagewalk: fix misbehavior of walk_page_range for vma(VM_PFNMAP) (Naoya Horiguchi)  [Orabug:
    28505519]  {CVE-2018-3620}
    - pagewalk: improve vma handling (Naoya Horiguchi)  [Orabug: 28505519]  {CVE-2018-3620}
    - mm/pagewalk: remove pgd_entry() and pud_entry() (Naoya Horiguchi)  [Orabug: 28505519]  {CVE-2018-3620}
    - mm/pagewalk.c: fix walk_page_range() access of wrong PTEs (Chen LinX)  [Orabug: 28505519]     {CVE-2018-3620}
    - mm/pagewalk.c: walk_page_range should avoid VM_PFNMAP areas (Cliff Wickman)  [Orabug: 28505519]     {CVE-2018-3620}
    - pagewalk: don't look up vma if walk->hugetlb_entry is unused (KOSAKI Motohiro)  [Orabug: 28505519]     {CVE-2018-3620}
    - x86/speculation/l1tf: Add sysfs reporting for l1tf (Andi Kleen)  [Orabug: 28505519]  {CVE-2018-3620}
    - x86/bugs: Concentrate bug reporting into a separate function (Konrad Rzeszutek Wilk)  [Orabug: 28505519]     {CVE-2018-3620}
    - x86/bugs: Concentrate bug detection into a separate function (Konrad Rzeszutek Wilk)  [Orabug: 28505519]     {CVE-2018-3620}
    - x86/cpufeature: Add X86_FEATURE_IA32_ARCH_CAPS and X86_FEATURE_IBRS_ATT (Konrad Rzeszutek Wilk)     [Orabug: 28505519]  {CVE-2018-3620}
    - x86/speculation/l1tf: Make sure the first page is always reserved (Andi Kleen)  [Orabug: 28505519]     {CVE-2018-3620}
    - x86/speculation/l1tf: Fix up pte->pfn conversion for PAE (Michal Hocko)  [Orabug: 28505519]     {CVE-2018-3620}
    - x86/speculation/l1tf: Protect PROT_NONE PTEs against speculation (Andi Kleen)  [Orabug: 28505519]     {CVE-2018-3620}
    - x86/speculation/l1tf: Protect swap entries against L1TF (Linus Torvalds)  [Orabug: 28505519]     {CVE-2018-3620}
    - x86/speculation/l1tf: Change order of offset/type in swap entry (Linus Torvalds)  [Orabug: 28505519]     {CVE-2018-3620}
    - x86/mm: Fix swap entry comment and macro (Dave Hansen)  [Orabug: 28505519]  {CVE-2018-3620}
    - x86/mm: Move swap offset/type up in PTE to work around erratum (Dave Hansen)  [Orabug: 28505519]     {CVE-2018-3620}
    - mm: x86 pgtable: drop unneeded preprocessor ifdef (Cyrill Gorcunov)  [Orabug: 28505519]  {CVE-2018-3620}
    - x86/speculation/l1tf: Increase 32bit PAE __PHYSICAL_PAGE_SHIFT (Andi Kleen)  [Orabug: 28505519]     {CVE-2018-3620}
    - x86/mm: Fix regression with huge pages on PAE (Kirill A. Shutemov)  [Orabug: 28505519]  {CVE-2018-3620}
    - x86/asm: Fix pud/pmd interfaces to handle large PAT bit (Toshi Kani)  [Orabug: 28505519]     {CVE-2018-3620}
    - x86/asm: Add pud/pmd mask interfaces to handle large PAT bit (Toshi Kani)  [Orabug: 28505519]     {CVE-2018-3620}
    - x86/asm: Move PUD_PAGE macros to page_types.h (Toshi Kani)  [Orabug: 28505519]  {CVE-2018-3620}
    - x86/cpufeature: uniquely define *IA32_ARCH_CAPS and *IBRS_ATT (Daniel Jordan)  [Orabug: 28505519]     {CVE-2018-3620}
    - mm/mempolicy: fix use after free when calling get_mempolicy (zhong jiang)  [Orabug: 28022110]     {CVE-2018-10675}

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote OracleVM system is missing necessary patches to address critical security updates : please see Oracle VM Security Advisory OVMSA-2018-0272 for details.

ID	Name	Product	Family	Published	Updated	Severity
132101	Windows Speculative Execution Configuration Check	Nessus	Windows	12/18/2019	8/10/2026	medium
111703	CentOS 7 : kernel (CESA-2018:2384) (Foreshadow)	Nessus	CentOS Local Security Checks	8/15/2018	8/21/2024	high
111837	SUSE SLES12 Security Update : kernel (SUSE-SU-2018:2374-1) (Foreshadow)	Nessus	SuSE Local Security Checks	8/17/2018	8/16/2024	high
117513	Oracle Linux 5 / 6 : Unbreakable Enterprise kernel (ELSA-2018-4214)	Nessus	Oracle Linux Local Security Checks	9/17/2018	2/9/2026	high
118963	OracleVM 3.2 : xen (OVMSA-2018-0272) (Foreshadow) (Spectre)	Nessus	OracleVM Local Security Checks	11/15/2018	1/9/2026	high

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