The ovl_setattr function in fs/overlayfs/inode.c in the Linux kernel through 4.3.3 attempts to merge distinct setattr operations, which allows local users to bypass intended access restrictions and modify the attributes of arbitrary overlay files via a crafted application.

According to the versions of the kernel packages installed, the EulerOS Virtualization for ARM 64 installation on the remote host is affected by the following vulnerabilities :

  - The kernel package contains the Linux kernel (vmlinuz),     the core of any Linux operating system. The kernel     handles the basic functions of the operating system:
    memory allocation, process allocation, device input and     output, etc.Security Fix(es):A flaw named FragmentSmack     was found in the way the Linux kernel handled     reassembly of fragmented IPv4 and IPv6 packets. A     remote attacker could use this flaw to trigger time and     calculation expensive fragment reassembly algorithm by     sending specially crafted packets which could lead to a     CPU saturation and hence a denial of service on the     system.(CVE-2018-5391)Multiple out-of-bounds write     flaws were found in the way the Cherry Cymotion     keyboard driver, KYE/Genius device drivers, Logitech     device drivers, Monterey Genius KB29E keyboard driver,     Petalynx Maxter remote control driver, and Sunplus     wireless desktop driver handled HID reports with an     invalid report descriptor size. An attacker with     physical access to the system could use either of these     flaws to write data past an allocated memory     buffer.(CVE-2014-3184)The __get_data_block function in     fs/f2fs/data.c in the Linux kernel before 4.11 allows     local users to cause a denial of service (integer     overflow and loop) via crafted use of the open and     fallocate system calls with an FS_IOC_FIEMAP     ioctl.(CVE-2017-18257)netetfilter/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.(CVE-2017-17450)A denial of service     flaw was discovered in the Linux kernel, where a race     condition caused a NULL pointer dereference in the RDS     socket-creation code. A local attacker could use this     flaw to create a situation in which a NULL pointer     crashed the kernel.(CVE-2015-7990)An issue was     discovered in the Linux kernel before 4.19.9. The USB     subsystem mishandles size checks during the reading of     an extra descriptor, related to
    __usb_get_extra_descriptor in     drivers/usb/core/usb.c.(CVE-2018-20169)mm/memory.c in     the Linux kernel before 4.1.4 mishandles anonymous     pages, which allows local users to gain privileges or     cause a denial of service (page tainting) via a crafted     application that triggers writing to page     zero.(CVE-2015-3288)The ovl_setattr function in     fs/overlayfs/inode.c in the Linux kernel through 4.3.3     attempts to merge distinct setattr operations, which     allows local users to bypass intended access     restrictions and modify the attributes of arbitrary     overlay files via a crafted     application.(CVE-2015-8660)A flaw was found in the     Linux kernel where a local user with a shell account     can abuse the userfaultfd syscall when using hugetlbfs.
    A missing size check in hugetlb_mcopy_atomic_pte could     create an invalid inode variable, leading to a kernel     panic.(CVE-2017-15128)An integer overflow flaw was     found in the way the lzo1x_decompress_safe() function     of the Linux kernel's LZO implementation processed     Literal Runs. A local attacker could, in extremely rare     cases, use this flaw to crash the system or,     potentially, escalate their privileges on the     system.(CVE-2014-4608)It was found that Linux kernel's     ptrace subsystem did not properly sanitize the     address-space-control bits when the program-status word     (PSW) was being set. On IBM S/390 systems, a local,     unprivileged user could use this flaw to set     address-space-control bits to the kernel space, and     thus gain read and write access to kernel     memory.(CVE-2014-3534)A use-after-free flaw was found     in the Linux kernel's file system encryption     implementation. A local user could revoke keyring keys     being used for ext4, f2fs, or ubifs encryption, causing     a denial of service on the system.(CVE-2017-7374)The     usbip_recv_xbuff function in     drivers/usb/usbip/usbip_common.c in the Linux kernel     before 4.5.3 allows remote attackers to cause a denial     of service (out-of-bounds write) or possibly have     unspecified other impact via a crafted length value in     a USB/IP packet.(CVE-2016-3955)A flaw was found in the     patches used to fix the 'dirtycow' vulnerability     (CVE-2016-5195). An attacker, able to run local code,     can exploit a race condition in transparent huge pages     to modify usually read-only huge     pages.(CVE-2017-1000405)The aio_mount function in     fs/aio.c in the Linux kernel does not properly restrict     execute access, which makes it easier for local users     to bypass intended SELinux W^X policy     restrictions.(CVE-2016-10044)The Serial Attached SCSI     (SAS) implementation in the Linux kernel mishandles a     mutex within libsas. This allows local users to cause a     denial of service (deadlock) by triggering certain     error-handling code.(CVE-2017-18232)A use-after-free     vulnerability was found in tcp_xmit_retransmit_queue     and other tcp_* functions. This condition could allow     an attacker to send an incorrect selective     acknowledgment to existing connections, possibly     resetting a connection.(CVE-2016-6828)The instruction     decoder in arch/x86/kvm/emulate.c in the KVM subsystem     in the Linux kernel before 3.18-rc2 does not properly     handle invalid instructions, which allows guest OS     users to cause a denial of service (NULL pointer     dereference and host OS crash) via a crafted     application that triggers (1) an improperly fetched     instruction or (2) an instruction that occupies too     many bytes. NOTE: this vulnerability exists because of     an incomplete fix for CVE-2014-8480.(CVE-2014-8481)The     snd_compress_check_input function in     sound/core/compress_offload.c in the ALSA subsystem in     the Linux kernel before 3.17 does not properly check     for an integer overflow, which allows local users to     cause a denial of service (insufficient memory     allocation) or possibly have unspecified other impact     via a crafted SNDRV_COMPRESS_SET_PARAMS ioctl     call.(CVE-2014-9904)The resv_map_release function in     mm/hugetlb.c in the Linux kernel, through 4.15.7,     allows local users to cause a denial of service (BUG)     via a crafted application that makes mmap system calls     and has a large pgoff argument to the remap_file_pages     system call.(CVE-2018-7740)

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

According to the versions of the kernel packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - An information-leak vulnerability was found in the     kernel when it truncated a file to a smaller size which     consisted of an inline extent that was compressed. The     data between the new file size and the old file size     was not discarded and the number of bytes used by the     inode were not correctly decremented, which gave the     wrong report for callers of the stat(2) syscall. This     wasted metadata space and allowed for the truncated     data to be leaked, and data corruption or loss to     occur. A caller of the clone ioctl could exploit this     flaw by using only standard file-system operations     without root access to read the truncated     data.(CVE-2015-8374)

  - A flaw was found in the Linux kernel's key management     system where it was possible for an attacker to     escalate privileges or crash the machine. If a user key     gets negatively instantiated, an error code is cached     in the payload area. A negatively instantiated key may     be then be positively instantiated by updating it with     valid data. However, the -i1/4zupdate key type method     must be aware that the error code may be     there.(CVE-2015-8539)

  - A NULL pointer dereference flaw was found in the way     the Linux kernel's network subsystem handled socket     creation with an invalid protocol identifier. A local     user could use this flaw to crash the     system.(CVE-2015-8543)

  - An out-of-bounds flaw was found in the kernel, where     the length of the sockaddr parameter was not checked in     the pptp_bind() and pptp_connect() functions. As a     result, more kernel memory was copied out than     required, leaking information from the kernel stack     (including kernel addresses). A local system user could     exploit this flaw to bypass kernel ASLR or leak other     information.(CVE-2015-8569)

  - An out-of-bounds flaw was found in the kernel, where     the sco_sock_bind() function (bluetooth/sco) did not     check the length of its sockaddr parameter. As a     result, more kernel memory was copied out than     required, leaking information from the kernel stack     (including kernel addresses). A local user could     exploit this flaw to bypass kernel ASLR or leak other     information.(CVE-2015-8575)

  - The ovl_setattr function in fs/overlayfs/inode.c in the     Linux kernel through 4.3.3 attempts to merge distinct     setattr operations, which allows local users to bypass     intended access restrictions and modify the attributes     of arbitrary overlay files via a crafted     application.(CVE-2015-8660)

  - A NULL pointer dereference flaw was found in the Linux     kernel: the NFSv4.2 migration code improperly     initialized the kernel structure. A local,     authenticated user could use this flaw to cause a panic     of the NFS client (denial of service).(CVE-2015-8746)

  - A race condition flaw was found in the way the Linux     kernel's SCTP implementation handled sctp_accept()     during the processing of heartbeat timeout events. A     remote attacker could use this flaw to prevent further     connections to be accepted by the SCTP server running     on the system, resulting in a denial of     service.(CVE-2015-8767)

  - An infinite-loop flaw was found in the kernel. When a     local user calls the sys_writev syscall with a     specially crafted sequence of iov structs, the     fuse_fill_write_pages kernel function might never     terminate, instead continuing in a tight loop. This     process cannot be terminated and requires a     reboot.(CVE-2015-8785)

  - A NULL-pointer dereference vulnerability was found in     the Linux kernel's TCP stack, in     net/netfilter/nf_nat_redirect.c in the     nf_nat_redirect_ipv4() function. A remote,     unauthenticated user could exploit this flaw to create     a system crash (denial of service).(CVE-2015-8787)

  - A use-after-free flaw was found in the CXGB3 kernel     driver when the network was considered to be congested.
    The kernel incorrectly misinterpreted the congestion as     an error condition and incorrectly freed or cleaned up     the socket buffer (skb). When the device then sent the     skb's queued data, these structures were referenced. A     local attacker could use this flaw to panic the system     (denial of service) or, with a local account, escalate     their privileges.(CVE-2015-8812)

  - The hub_activate function in drivers/usb/core/hub.c in     the Linux kernel before 4.3.5 does not properly     maintain a hub-interface data structure, which allows     physically proximate attackers to cause a denial of     service (invalid memory access and system crash) or     possibly have unspecified other impact by unplugging a     USB hub device.(CVE-2015-8816)

  - The ioresources_init function in kernel/resource.c in     the Linux kernel through 4.7, as used in Android before     2016-08-05 on Nexus 6 and 7 (2013) devices, uses weak     permissions for /proc/iomem, which allows local users     to obtain sensitive information by reading this file,     aka Android internal bug 28814213 and Qualcomm internal     bug CR786116. NOTE: the permissions may be intentional     in most non-Android contexts.(CVE-2015-8944)

  - 'A flaw was found in the Linux kernel's implementation     of overlayfs. An attacker can leak file resources in     the system by opening a large file with write     permissions on a overlay filesystem that is     insufficient to deal with the size of the write.

  - When unmounting the underlying device, the system is     unable to free an inode and this will consume     resources. Repeating this for all available inodes and     memory will create a denial of service     situation.(CVE-2015-8953)'

  - The rfcomm_sock_bind function in     net/bluetooth/rfcomm/sock.c in the Linux kernel before     4.2 allows local users to obtain sensitive information     or cause a denial of service (NULL pointer dereference)     via vectors involving a bind system call on a Bluetooth     RFCOMM socket.(CVE-2015-8956)

  - A flaw was found in the ext4 subsystem. This     vulnerability is a use after free vulnerability was     found in __ext4_journal_stop(). Attackers could abuse     this to allow any code which attempts to deal with the     journal failure to be mishandled or not fail at all.
    This could lead to data corruption or     crashes.(CVE-2015-8961)

  - A flaw was found in the Linux kernel SCSI subsystem,     which allowed a local user to gain privileges or cause     a denial of service (memory corruption and system     crash) by issuing an SG_IO ioctl call while a device     was being detached.(CVE-2015-8962)

  - Race condition in kernel/events/core.c in the Linux     kernel before 4.4 allows local users to gain privileges     or cause a denial of service via use-after-free     vulnerability by leveraging incorrect handling of an     swevent data structure during a CPU unplug     operation.(CVE-2015-8963)

  - The tty_set_termios_ldisc() function in     'drivers/tty/tty_ldisc.c' in the Linux kernel before     4.5 allows local users to obtain sensitive information     from kernel memory by reading a tty data     structure.(CVE-2015-8964)

  - The lrw_crypt() function in 'crypto/lrw.c' in the Linux     kernel before 4.5 allows local users to cause a system     crash and a denial of service by the NULL pointer     dereference via accept(2) system call for AF_ALG socket     without calling setkey() first to set a cipher     key.(CVE-2015-8970)

  - It was found that kernel/events/core.c in the Linux     kernel mishandles counter grouping, which allows local     users to gain privileges via a crafted application,     related to the perf_pmu_register and perf_event_open     functions.(CVE-2015-9004)

  - A use-after-free flaw was discovered in the Linux     kernel's tty subsystem, which allows for the disclosure     of uncontrolled memory location and possible kernel     panic. The information leak is caused by a race     condition when attempting to set and read the tty line     discipline. A local attacker could use the TIOCSETD     (via tty_set_ldisc ) to switch to a new line discipline     a concurrent call to a TIOCGETD ioctl performing a read     on a given tty could then access previously allocated     memory. Up to 4 bytes could be leaked when querying the     line discipline or the kernel could panic with a     NULL-pointer dereference.(CVE-2016-0723)

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

According to the versions of the kernel packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - A race condition flaw was found in the way the Linux     kernel's SCTP implementation handled sctp_accept()     during the processing of heartbeat timeout events. A     remote attacker could use this flaw to prevent further     connections to be accepted by the SCTP server running     on the system, resulting in a denial of     service.(CVE-2015-8767)

  - The ovl_setattr function in fs/overlayfs/inode.c in the     Linux kernel through 4.3.3 attempts to merge distinct     setattr operations, which allows local users to bypass     intended access restrictions and modify the attributes     of arbitrary overlay files via a crafted     application.(CVE-2015-8660)

  - Several Moderate and Low impact security issues were     found in the Linux kernel. Space precludes documenting     each of these issues in this advisory. Refer to the CVE     links in the References section for a description of     each of these vulnerabilities. (CVE-2015-8746,     CVE-2015-8812, CVE-2016-2069, CVE-2016-2117,     CVE-2016-2384, CVE-2016-2847)

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

The remote OracleVM system is missing necessary patches to address critical security updates :

  - KEYS: potential uninitialized variable (Dan Carpenter)     [Orabug: 24393865] (CVE-2016-4470)

  - ovl: fix permission checking for setattr (Miklos     Szeredi) [Orabug: 24393742] (CVE-2015-8660)

The remote Oracle Linux 6 / 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2016-3593 advisory.

  - The ovl_setattr function in fs/overlayfs/inode.c in the Linux kernel through 4.3.3 attempts to merge     distinct setattr operations, which allows local users to bypass intended access restrictions and modify     the attributes of arbitrary overlay files via a crafted application. (CVE-2015-8660)

  - The key_reject_and_link function in security/keys/key.c in the Linux kernel through 4.6.3 does not ensure     that a certain data structure is initialized, which allows local users to cause a denial of service     (system crash) via vectors involving a crafted keyctl request2 command. (CVE-2016-4470)

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

To see the complete list of bug fixes, users are directed to the related Knowledge Article :

Security Fix(es) :

  - A flaw was found in the Linux kernel's keyring handling     code, where in key_reject_and_link() an uninitialised     variable would eventually lead to arbitrary free address     which could allow attacker to use a use-after-free style     attack. (CVE-2016-4470, Important)

  - The ovl_setattr function in fs/overlayfs/inode.c in the     Linux kernel through 4.3.3 attempts to merge distinct     setattr operations, which allows local users to bypass     intended access restrictions and modify the attributes     of arbitrary overlay files via a crafted application.
    (CVE-2015-8660, Moderate)

  - It was reported that on s390x, the fork of a process     with four page table levels will cause memory corruption     with a variety of symptoms. All processes are created     with three level page table and a limit of 4TB for the     address space. If the parent process has four page table     levels with a limit of 8PB, the function that duplicates     the address space will try to copy memory areas outside     of the address space limit for the child process.
    (CVE-2016-2143, Moderate)

Bug Fix(es) :

  - The glibc headers and the Linux headers share certain     definitions of key structures that are required to be     defined in kernel and in userspace. In some instances     both userspace and sanitized kernel headers have to be     included in order to get the structure definitions     required by the user program. Unfortunately because the     glibc and Linux headers don't coordinate this can result     in compilation errors. The glibc headers have therefore     been fixed to coordinate with Linux UAPI-based headers.
    With the header coordination compilation errors no     longer occur.

  - When running the TCP/IPv6 traffic over the mlx4_en     networking interface on the big endian architectures,     call traces reporting about a 'hw csum failure' could     occur. With this update, the mlx4_en driver has been     fixed by correction of the checksum calculation for the     big endian architectures. As a result, the call trace     error no longer appears in the log messages.

  - Under significant load, some applications such as     logshifter could generate bursts of log messages too     large for the system logger to spool. Due to a race     condition, log messages from that application could then     be lost even after the log volume dropped to manageable     levels. This update fixes the kernel mechanism used to     notify the transmitter end of the socket used by the     system logger that more space is available on the     receiver side, removing a race condition which     previously caused the sender to stop transmitting new     messages and allowing all log messages to be processed     correctly.

  - Previously, after heavy open or close of the Accelerator     Function Unit (AFU) contexts, the interrupt packet went     out and the AFU context did not see any interrupts.
    Consequently, a kernel panic could occur. The provided     patch set fixes handling of the interrupt requests, and     kernel panic no longer occurs in the described     situation.

  - net: recvfrom would fail on short buffer.

  - Backport rhashtable changes from upstream.

  - Server Crashing after starting Glusterd &amp; creating     volumes.

  - RAID5 reshape deadlock fix.

  - BDX perf uncore support fix.

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.

These updated kernel packages include several security issues and numerous bug fixes, some of which you can see below. Space precludes documenting all of these bug fixes in this advisory. To see the complete list of bug fixes, users are directed to the related Knowledge Article: https://access.redhat.com/articles/2460971.

Security Fix(es) :

* A flaw was found in the Linux kernel's keyring handling code, where in key_reject_and_link() an uninitialised variable would eventually lead to arbitrary free address which could allow attacker to use a use-after-free style attack. (CVE-2016-4470, Important)

* The ovl_setattr function in fs/overlayfs/inode.c in the Linux kernel through 4.3.3 attempts to merge distinct setattr operations, which allows local users to bypass intended access restrictions and modify the attributes of arbitrary overlay files via a crafted application.
(CVE-2015-8660, Moderate)

* It was reported that on s390x, the fork of a process with four page table levels will cause memory corruption with a variety of symptoms.
All processes are created with three level page table and a limit of 4TB for the address space. If the parent process has four page table levels with a limit of 8PB, the function that duplicates the address space will try to copy memory areas outside of the address space limit for the child process. (CVE-2016-2143, Moderate)

Red Hat would like to thank Nathan Williams for reporting CVE-2015-8660. The CVE-2016-4470 issue was discovered by David Howells (Red Hat Inc.).

Bug Fix(es) :

* The glibc headers and the Linux headers share certain definitions of key structures that are required to be defined in kernel and in userspace. In some instances both userspace and sanitized kernel headers have to be included in order to get the structure definitions required by the user program. Unfortunately because the glibc and Linux headers don't coordinate this can result in compilation errors.
The glibc headers have therefore been fixed to coordinate with Linux UAPI-based headers. With the header coordination compilation errors no longer occur. (BZ#1331285)

* When running the TCP/IPv6 traffic over the mlx4_en networking interface on the big endian architectures, call traces reporting about a 'hw csum failure' could occur. With this update, the mlx4_en driver has been fixed by correction of the checksum calculation for the big endian architectures. As a result, the call trace error no longer appears in the log messages. (BZ#1337431)

* Under significant load, some applications such as logshifter could generate bursts of log messages too large for the system logger to spool. Due to a race condition, log messages from that application could then be lost even after the log volume dropped to manageable levels. This update fixes the kernel mechanism used to notify the transmitter end of the socket used by the system logger that more space is available on the receiver side, removing a race condition which previously caused the sender to stop transmitting new messages and allowing all log messages to be processed correctly. (BZ#1337513)

* Previously, after heavy open or close of the Accelerator Function Unit (AFU) contexts, the interrupt packet went out and the AFU context did not see any interrupts. Consequently, a kernel panic could occur.
The provided patch set fixes handling of the interrupt requests, and kernel panic no longer occurs in the described situation. (BZ#1338886)

* net: recvfrom would fail on short buffer. (BZ#1339115)

* Backport rhashtable changes from upstream. (BZ#1343639)

* Server Crashing after starting Glusterd & creating volumes.
(BZ#1344234)

* RAID5 reshape deadlock fix. (BZ#1344313)

* BDX perf uncore support fix. (BZ#1347374)

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.

* A flaw was found in the Linux kernel's keyring handling code, where in key_reject_and_link() an uninitialised variable would eventually lead to arbitrary free address which could allow attacker to use a use-after-free style attack. (CVE-2016-4470, Important)

* The ovl_setattr function in fs/overlayfs/inode.c in the Linux kernel through 4.3.3 attempts to merge distinct setattr operations, which allows local users to bypass intended access restrictions and modify the attributes of arbitrary overlay files via a crafted application.
(CVE-2015-8660, Moderate)

Red Hat would like to thank Nathan Williams for reporting CVE-2015-8660. The CVE-2016-4470 issue was discovered by David Howells (Red Hat Inc.).

The kernel-rt packages have been upgraded to the kernel-3.10.0-327.28.2.el7 source tree, which provides a number of bug fixes over the previous version. (BZ#1350307)

This update also fixes the following bugs :

* Previously, use of the get/put_cpu_var() function in function refill_stock () from the memcontrol cgroup code lead to a 'scheduling while atomic' warning. With this update, refill_stock() uses the get/put_cpu_light() function instead, and the warnings no longer appear. (BZ#1347171)

* Prior to this update, if a real time task pinned to a given CPU was taking 100% of the CPU time, then calls to the lru_add_drain_all() function on other CPUs blocked for an undetermined amount of time.
This caused latencies and undesired side effects. With this update, lru_add_drain_all() has been changed to drain the LRU pagevecs of remote CPUs. (BZ#1348523)

An update for kernel-rt is now available for Red Hat Enterprise MRG 2.5.

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.

* A flaw was found in the Linux kernel's keyring handling code, where in key_reject_and_link() an uninitialised variable would eventually lead to arbitrary free address which could allow attacker to use a use-after-free style attack. (CVE-2016-4470, Important)

* The ovl_setattr function in fs/overlayfs/inode.c in the Linux kernel through 4.3.3 attempts to merge distinct setattr operations, which allows local users to bypass intended access restrictions and modify the attributes of arbitrary overlay files via a crafted application.
(CVE-2015-8660, Moderate)

Red Hat would like to thank Nathan Williams for reporting CVE-2015-8660. The CVE-2016-4470 issue was discovered by David Howells (Red Hat Inc.).

The kernel-rt packages have been upgraded to upstream version 3.10.0-327.rt56.194.el6, which provides a number of bug fixes over the previous version. (BZ#1343658)

This update also fixes the following bugs :

* Previously, use of the get/put_cpu_var() function in function refill_stock () from the memcontrol cgroup code lead to a 'scheduling while atomic' warning. With this update, refill_stock() uses the get/put_cpu_light() function instead, and the warnings no longer appear. (BZ#1348710)

* Prior to this update, if a real time task pinned to a given CPU was taking 100% of the CPU time, then calls to the lru_add_drain_all() function on other CPUs blocked for an undetermined amount of time.
This caused latencies and undesired side effects. With this update, lru_add_drain_all() has been changed to drain the LRU pagevecs of remote CPUs. (BZ#1348711)

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2016-1539 advisory.

  - The ovl_setattr function in fs/overlayfs/inode.c in the Linux kernel through 4.3.3 attempts to merge     distinct setattr operations, which allows local users to bypass intended access restrictions and modify     the attributes of arbitrary overlay files via a crafted application. (CVE-2015-8660)

  - The key_reject_and_link function in security/keys/key.c in the Linux kernel through 4.6.3 does not ensure     that a certain data structure is initialized, which allows local users to cause a denial of service     (system crash) via vectors involving a crafted keyctl request2 command. (CVE-2016-4470)

  - The fork implementation in the Linux kernel before 4.5 on s390 platforms mishandles the case of four page-     table levels, which allows local users to cause a denial of service (system crash) or possibly have     unspecified other impact via a crafted application, related to arch/s390/include/asm/mmu_context.h and     arch/s390/include/asm/pgalloc.h. (CVE-2016-2143)

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

The SUSE Linux Enterprise 12 SP1 kernel was updated to 3.12.53 to receive various security and bugfixes.

The following security bugs were fixed :

  - CVE-2013-7446: Use-after-free vulnerability in     net/unix/af_unix.c in the Linux kernel allowed local     users to bypass intended AF_UNIX socket permissions or     cause a denial of service (panic) via crafted epoll_ctl     calls (bnc#955654).

  - CVE-2015-5707: Integer overflow in the sg_start_req     function in drivers/scsi/sg.c in the Linux kernel     allowed local users to cause a denial of service or     possibly have unspecified other impact via a large     iov_count value in a write request (bnc#940338).

  - CVE-2015-7550: The keyctl_read_key function in     security/keys/keyctl.c in the Linux kernel did not     properly use a semaphore, which allowed local users to     cause a denial of service (NULL pointer dereference and     system crash) or possibly have unspecified other impact     via a crafted application that leverages a race     condition between keyctl_revoke and keyctl_read calls     (bnc#958951).

  - CVE-2015-7799: The slhc_init function in     drivers/net/slip/slhc.c in the Linux kernel did not     ensure that certain slot numbers are valid, which     allowed local users to cause a denial of service (NULL     pointer dereference and system crash) via a crafted     PPPIOCSMAXCID ioctl call (bnc#949936).

  - CVE-2015-8215: net/ipv6/addrconf.c in the IPv6 stack in     the Linux kernel did not validate attempted changes to     the MTU value, which allowed context-dependent attackers     to cause a denial of service (packet loss) via a value     that was (1) smaller than the minimum compliant value or     (2) larger than the MTU of an interface, as demonstrated     by a Router Advertisement (RA) message that is not     validated by a daemon, a different vulnerability than     CVE-2015-0272 (bnc#955354).

  - CVE-2015-8539: The KEYS subsystem in the Linux kernel     allowed local users to gain privileges or cause a denial     of service (BUG) via crafted keyctl commands that     negatively instantiate a key, related to     security/keys/encrypted-keys/encrypted.c,     security/keys/trusted.c, and     security/keys/user_defined.c (bnc#958463).

  - CVE-2015-8543: The networking implementation in the     Linux kernel did not validate protocol identifiers for     certain protocol families, which allowed local users to     cause a denial of service (NULL function pointer     dereference and system crash) or possibly gain     privileges by leveraging CLONE_NEWUSER support to     execute a crafted SOCK_RAW application (bnc#958886).

  - CVE-2015-8550: Optimizations introduced by the compiler     could have lead to double fetch vulnerabilities,     potentially possibly leading to arbitrary code execution     in backend (bsc#957988).

  - CVE-2015-8551: Xen PCI backend driver did not perform     proper sanity checks on the device's state, allowing for     DoS (bsc#957990).

  - CVE-2015-8569: The (1) pptp_bind and (2) pptp_connect     functions in drivers/net/ppp/pptp.c in the Linux kernel     did not verify an address length, which allowed local     users to obtain sensitive information from kernel memory     and bypass the KASLR protection mechanism via a crafted     application (bnc#959190).

  - CVE-2015-8575: The sco_sock_bind function in     net/bluetooth/sco.c in the Linux kernel did not verify     an address length, which allowed local users to obtain     sensitive information from kernel memory and bypass the     KASLR protection mechanism via a crafted application     (bnc#959399).

  - CVE-2015-8660: The ovl_setattr function in     fs/overlayfs/inode.c in the Linux kernel attempted to     merge distinct setattr operations, which allowed local     users to bypass intended access restrictions and modify     the attributes of arbitrary overlay files via a crafted     application (bnc#960281).

  - CVE-2015-8767: net/sctp/sm_sideeffect.c in the Linux     kernel did not properly manage the relationship between     a lock and a socket, which allowed local users to cause     a denial of service (deadlock) via a crafted sctp_accept     call (bnc#961509).

  - CVE-2015-8785: The fuse_fill_write_pages function in     fs/fuse/file.c in the Linux kernel allowed local users     to cause a denial of service (infinite loop) via a     writev system call that triggers a zero length for the     first segment of an iov (bnc#963765).

  - CVE-2016-0723: Race condition in the tty_ioctl function     in drivers/tty/tty_io.c in the Linux kernel allowed     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 (bnc#961500).

  - CVE-2016-2069: A race in invalidating paging structures     that were not in use locally could have lead to     disclosoure of information or arbitrary code exectution     (bnc#963767).

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.

Nathan Williams discovered that overlayfs in the Linux kernel incorrectly handled setattr operations. A local unprivileged attacker could use this to create files with administrative permission attributes and execute arbitrary code with elevated privileges.

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

The remote Ubuntu 14.04 LTS host has a package installed that is affected by a vulnerability as referenced in the USN-2858-2 advisory.

  - The ovl_setattr function in fs/overlayfs/inode.c in the Linux kernel through 4.3.3 attempts to merge     distinct setattr operations, which allows local users to bypass intended access restrictions and modify     the attributes of arbitrary overlay files via a crafted application. (CVE-2015-8660)

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

The remote Ubuntu 14.04 LTS host has a package installed that is affected by a vulnerability as referenced in the USN-2857-2 advisory.

  - The ovl_setattr function in fs/overlayfs/inode.c in the Linux kernel through 4.3.3 attempts to merge     distinct setattr operations, which allows local users to bypass intended access restrictions and modify     the attributes of arbitrary overlay files via a crafted application. (CVE-2015-8660)

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

ID	Name	Product	Family	Severity
124828	EulerOS Virtualization for ARM 64 3.0.1.0 : kernel (EulerOS-SA-2019-1505)	Nessus	Huawei Local Security Checks	critical
124813	EulerOS Virtualization 3.0.1.0 : kernel (EulerOS-SA-2019-1489)	Nessus	Huawei Local Security Checks	critical
99783	EulerOS 2.0 SP1 : kernel (EulerOS-SA-2016-1020)	Nessus	Huawei Local Security Checks	critical
92782	OracleVM 3.4 : Unbreakable / etc (OVMSA-2016-0094)	Nessus	OracleVM Local Security Checks	medium
92781	Oracle Linux 6 / 7 : Unbreakable Enterprise kernel (ELSA-2016-3593)	Nessus	Oracle Linux Local Security Checks	medium
92719	Scientific Linux Security Update : kernel on SL7.x x86_64 (20160802)	Nessus	Scientific Linux Local Security Checks	high
92702	CentOS 7 : kernel (CESA-2016:1539)	Nessus	CentOS Local Security Checks	high
92695	RHEL 7 : kernel-rt (RHSA-2016:1541)	Nessus	Red Hat Local Security Checks	medium
92694	RHEL 7 : kernel (RHSA-2016:1539)	Nessus	Red Hat Local Security Checks	high
92692	RHEL 6 : MRG (RHSA-2016:1532)	Nessus	Red Hat Local Security Checks	medium
92688	Oracle Linux 7 : kernel (ELSA-2016-1539)	Nessus	Oracle Linux Local Security Checks	high
89022	SUSE SLED12 / SLES12 Security Update : kernel (SUSE-SU-2016:0585-1)	Nessus	SuSE Local Security Checks	high
87761	Ubuntu 15.10 : linux-raspi2 vulnerability (USN-2858-3)	Nessus	Ubuntu Local Security Checks	medium
87760	Ubuntu 14.04 LTS : Linux kernel (Wily HWE) vulnerability (USN-2858-2)	Nessus	Ubuntu Local Security Checks	medium
87759	Ubuntu 15.10 : linux vulnerability (USN-2858-1)	Nessus	Ubuntu Local Security Checks	medium
87758	Ubuntu 14.04 LTS : Linux kernel (Vivid HWE) vulnerability (USN-2857-2)	Nessus	Ubuntu Local Security Checks	medium
87757	Ubuntu 15.04 : linux vulnerability (USN-2857-1)	Nessus	Ubuntu Local Security Checks	medium

Detections

Analytics

CVE-2015-8660

medium

Tenable Plugins

critical

critical

critical

medium

medium

high

high

medium

high

medium

high

high

medium

medium

medium

medium

medium