Security Fix(es) :

  - hw: cpu: speculative execution permission faults     handling (CVE-2017-5754)

  - Kernel: error in exception handling leads to DoS     (CVE-2018-8897)

  - kernel: nfsd: Incorrect handling of long RPC replies     (CVE-2017-7645)

  - kernel: Use-after-free vulnerability in DCCP socket     (CVE-2017-8824)

  - kernel: v4l2: disabled memory access protection     mechanism allowing privilege escalation (CVE-2017-13166)

  - kernel: netfilter: use-after-free in     tcpmss_mangle_packet function in     net/netfilter/xt_TCPMSS.c (CVE-2017-18017)

  - kernel: Stack information leak in the EFS element     (CVE-2017-1000410)

An update for kernel is now available for Red Hat Enterprise Linux 6.

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) :

* hw: cpu: speculative execution permission faults handling (CVE-2017-5754, x86 32-bit)

* Kernel: error in exception handling leads to DoS (CVE-2018-8897)

* kernel: nfsd: Incorrect handling of long RPC replies (CVE-2017-7645)

* kernel: Use-after-free vulnerability in DCCP socket (CVE-2017-8824)

* kernel: v4l2: disabled memory access protection mechanism allowing privilege escalation (CVE-2017-13166)

* kernel: netfilter: use-after-free in tcpmss_mangle_packet function in net/ netfilter/xt_TCPMSS.c (CVE-2017-18017)

* kernel: Stack information leak in the EFS element (CVE-2017-1000410)

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 Google Project Zero for reporting CVE-2017-5754; Nick Peterson (Everdox Tech LLC) and Andy Lutomirski for reporting CVE-2018-8897; Mohamed Ghannam for reporting CVE-2017-8824; and Armis Labs for reporting CVE-2017-1000410.

Bug Fix(es) :

These updated kernel packages include also numerous bug fixes. Space precludes documenting all of these bug fixes in this advisory. See the bug fix descriptions in the related Knowledge Article:
https://access.redhat.com/ articles/3431591

This update for xen to version 4.9.2 fixes several issues. This feature was added :

  - Added script, udev rule and systemd service to watch for     vcpu online/offline events in a HVM domU. They are     triggered via 'xl vcpu-set domU N' These security issues     were fixed :

  - CVE-2018-8897: Prevent mishandling of debug exceptions     on x86 (XSA-260, bsc#1090820)

  - Handle HPET timers in IO-APIC mode correctly to prevent     malicious or buggy HVM guests from causing a hypervisor     crash or potentially privilege escalation/information     leaks (XSA-261, bsc#1090822)

  - Prevent unbounded loop, induced by qemu allowing an     attacker to permanently keep a physical CPU core busy     (XSA-262, bsc#1090823)

  - CVE-2018-10472: x86 HVM guest OS users (in certain     configurations) were able to read arbitrary dom0 files     via QMP live insertion of a CDROM, in conjunction with     specifying the target file as the backing file of a     snapshot (bsc#1089152).

  - CVE-2018-10471: x86 PV guest OS users were able to cause     a denial of service (out-of-bounds zero write and     hypervisor crash) via unexpected INT 80 processing,     because of an incorrect fix for CVE-2017-5754     (bsc#1089635).

  - CVE-2018-7540: x86 PV guest OS users were able to cause     a denial of service (host OS CPU hang) via     non-preemptable L3/L4 pagetable freeing (bsc#1080635).

  - CVE-2018-7541: Guest OS users were able to cause a     denial of service (hypervisor crash) or gain privileges     by triggering a grant-table transition from v2 to v1     (bsc#1080662).

  - CVE-2018-7542: x86 PVH guest OS users were able to cause     a denial of service (NULL pointer dereference and     hypervisor crash) by leveraging the mishandling of     configurations that lack a Local APIC (bsc#1080634).

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.

This update for xen fixes several issues. These security issues were fixed :

  - CVE-2018-8897: Prevent mishandling of debug exceptions     on x86 (XSA-260, bsc#1090820)

  - Handle HPET timers in IO-APIC mode correctly to prevent     malicious or buggy HVM guests from causing a hypervisor     crash or potentially privilege escalation/information     leaks (XSA-261, bsc#1090822)

  - Prevent unbounded loop, induced by qemu allowing an     attacker to permanently keep a physical CPU core busy     (XSA-262, bsc#1090823)

  - CVE-2018-10472: x86 HVM guest OS users (in certain     configurations) were able to read arbitrary dom0 files     via QMP live insertion of a CDROM, in conjunction with     specifying the target file as the backing file of a     snapshot (bsc#1089152).

  - CVE-2018-10471: x86 PV guest OS users were able to cause     a denial of service (out-of-bounds zero write and     hypervisor crash) via unexpected INT 80 processing,     because of an incorrect fix for CVE-2017-5754     (bsc#1089635).

  - CVE-2018-7550: The load_multiboot function allowed local     guest OS users to execute arbitrary code on the host via     a mh_load_end_addr value greater than mh_bss_end_addr,     which triggers an out-of-bounds read or write memory     access (bsc#1083292).

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 version of Citrix XenServer running on the remote host is missing a security hotfix. It is, therefore, affected by multiple vulnerabilities.

According to the versions of the parallels-server-bm-release / vzkernel / etc packages installed, the Virtuozzo installation on the remote host is affected by the following vulnerabilities :

  - An industry-wide issue was found in the way many modern     microprocessor designs have implemented speculative     execution of instructions (a commonly used performance     optimization). There are three primary variants of the     issue which differ in the way the speculative execution     can be exploited. Variant CVE-2017-5754 relies on the     fact that, on impacted microprocessors, during     speculative execution of instruction permission faults,     exception generation triggered by a faulting access is     suppressed until the retirement of the whole     instruction block. In a combination with the fact that     memory accesses may populate the cache even when the     block is being dropped and never committed (executed),     an unprivileged local attacker could use this flaw to     read privileged (kernel space) memory by conducting     targeted cache side-channel attacks. NOTE: This update     fixes the 32-bit compatibility layer on x86-64     processors, i.e. when 32-bit containers are executed on     64-bit processors.

  - A bug in the 32-bit compatibility layer of the ioctl     handling code of the v4l2 video driver in the Linux     kernel has been found. A memory protection mechanism     ensuring that user-provided buffers always point to a     userspace memory were disabled, allowing destination     address to be in a kernel space. This flaw could be     exploited by an attacker to overwrite a kernel memory     from an unprivileged userspace process, leading to     privilege escalation.

  - The KEYS subsystem in the Linux kernel omitted an     access-control check when writing a key to the current     task's default keyring, allowing a local user to bypass     security checks to the keyring. This compromises the     validity of the keyring for those who rely on it.

  - A flaw was found in the processing of incoming L2CAP     bluetooth commands. Uninitialized stack variables can     be sent to an attacker leaking data in kernel address     space.

  - Linux kernel before version 4.16-rc7 is vulnerable to a     null pointer dereference in dccp_write_xmit() function     in net/dccp/output.c in that allows a local user to     cause a denial of service by a number of certain     crafted system calls.

  - A flaw was found in the way the Linux kernel handled     exceptions delivered after a stack switch operation via     Mov SS or Pop SS instructions. During the stack switch     operation, the processor did not deliver interrupts and     exceptions, rather they are delivered once the first     instruction after the stack switch is executed. An     unprivileged system user could use this flaw to crash     the system kernel resulting in the denial of service.

  - net/netfilter/xt_osf.c in the Linux kernel through     4.14.4 does not require the CAP_NET_ADMIN capability     for add_callback and remove_callback operations. This     allows local users to bypass intended access     restrictions because the xt_osf_fingers data structure     is shared across all network namespaces.

  - The futex_requeue function in kernel/futex.c in the     Linux kernel, before 4.14.15, might allow attackers to     cause a denial of service (integer overflow) or     possibly have unspecified other impacts by triggering a     negative wake or requeue value.

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

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - A statement in the System Programming Guide of the Intel 64 and IA-32 Architectures Software Developer's     Manual (SDM) was mishandled in the development of some or all operating-system kernels, resulting in     unexpected behavior for #DB exceptions that are deferred by MOV SS or POP SS, as demonstrated by (for     example) privilege escalation in Windows, macOS, some Xen configurations, or FreeBSD, or a Linux kernel     crash. The MOV to SS and POP SS instructions inhibit interrupts (including NMIs), data breakpoints, and     single step trap exceptions until the instruction boundary following the next instruction (SDM Vol. 3A;
    section 6.8.3). (The inhibited data breakpoints are those on memory accessed by the MOV to SS or POP to SS     instruction itself.) Note that debug exceptions are not inhibited by the interrupt enable (EFLAGS.IF)     system flag (SDM Vol. 3A; section 2.3). If the instruction following the MOV to SS or POP to SS     instruction is an instruction like SYSCALL, SYSENTER, INT 3, etc. that transfers control to the operating     system at CPL < 3, the debug exception is delivered after the transfer to CPL < 3 is complete. OS kernels     may not expect this order of events and may therefore experience unexpected behavior when it occurs.
    (CVE-2018-8897)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote host is running a version of macOS / Mac OS X that is 10.13.x prior to 10.13.5. It is, therefore, affected by multiple vulnerabilities.

Note that successful exploitation of the most serious issues can result in arbitrary code execution.

A statement in the System Programming Guide of the Intel 64 and IA-32 Architectures Software Developer's Manual (SDM) was mishandled in the development of some or all operating-system kernels, resulting in unexpected behavior for #DB exceptions that are deferred by MOV SS or POP SS, as demonstrated by (for example) privilege escalation in Windows, macOS, some Xen configurations, or FreeBSD, or a Linux kernel crash. The MOV to SS and POP SS instructions inhibit interrupts (including NMIs), data breakpoints, and single step trap exceptions until the instruction boundary following the next instruction (SDM Vol. 3A; section 6.8.3). (The inhibited data breakpoints are those on memory accessed by the MOV to SS or POP to SS instruction itself.) Note that debug exceptions are not inhibited by the interrupt enable (EFLAGS.IF) system flag (SDM Vol. 3A; section 2.3). If the instruction following the MOV to SS or POP to SS instruction is an instruction like SYSCALL, SYSENTER, INT 3, etc. that transfers control to the operating system at CPL < 3, the debug exception is delivered after the transfer to CPL < 3 is complete. OS kernels may not expect this order of events and may therefore experience unexpected behavior when it occurs.

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.

ID	Name	Product	Family	Published	Updated	Severity
109643	Scientific Linux Security Update : kernel on SL6.x i386/x86_64 (20180508) (Meltdown)	Nessus	Scientific Linux Local Security Checks	5/9/2018	10/11/2024	critical
109655	CentOS 6 : kernel (CESA-2018:1319) (Meltdown)	Nessus	CentOS Local Security Checks	5/10/2018	12/31/2019	critical
109677	SUSE SLED12 / SLES12 Security Update : xen (SUSE-SU-2018:1184-1) (Meltdown)	Nessus	SuSE Local Security Checks	5/10/2018	10/10/2024	high
109721	SUSE SLES12 Security Update : xen (SUSE-SU-2018:1202-1) (Meltdown)	Nessus	SuSE Local Security Checks	5/11/2018	10/9/2024	high
109725	Citrix XenServer Multiple Vulnerabilities (CTX234679)	Nessus	Misc.	5/11/2018	10/9/2024	high
109801	Virtuozzo 6 : parallels-server-bm-release / vzkernel / etc (VZA-2018-029)	Nessus	Virtuozzo Local Security Checks	5/15/2018	10/8/2024	high
221854	Linux Distros Unpatched Vulnerability : CVE-2018-8897	Nessus	Misc.	3/4/2025	8/22/2025	high
700516	macOS 10.13.x < 10.13.5 Multiple Vulnerabilities	Nessus Network Monitor	Operating System Detection	4/10/2019	4/10/2019	critical
502397	Synology DiskStation Manager Debian Linux Race Condition (CVE-2018-8897)	Tenable OT Security	Tenable.ot	10/1/2024	10/2/2024	high

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