Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or have other impacts.

CVE-2014-9888

Russell King found that on ARM systems, memory allocated for DMA buffers was mapped with executable permission. This made it easier to exploit other vulnerabilities in the kernel.

CVE-2014-9895

Dan Carpenter found that the MEDIA_IOC_ENUM_LINKS ioctl on media devices resulted in an information leak.

CVE-2016-6786 / CVE-2016-6787

It was discovered that the performance events subsystem does not properly manage locks during certain migrations, allowing a local attacker to escalate privileges. This can be mitigated by disabling unprivileged use of performance events: sysctl kernel.perf_event_paranoid=3

CVE-2016-8405

Peter Pi of Trend Micro discovered that the frame buffer video subsystem does not properly check bounds while copying color maps to userspace, causing a heap buffer out-of-bounds read, leading to information disclosure.

CVE-2017-5549

It was discovered that the KLSI KL5KUSB105 serial USB device driver could log the contents of uninitialised kernel memory, resulting in an information leak.

CVE-2017-6001

Di Shen discovered a race condition between concurrent calls to the performance events subsystem, allowing a local attacker to escalate privileges. This flaw exists because of an incomplete fix of CVE-2016-6786. This can be mitigated by disabling unprivileged use of performance events: sysctl kernel.perf_event_paranoid=3

CVE-2017-6074

Andrey Konovalov discovered a use-after-free vulnerability in the DCCP networking code, which could result in denial of service or local privilege escalation. On systems that do not already have the dccp module loaded, this can be mitigated by disabling it: echo >> /etc/modprobe.d/disable-dccp.conf install dccp false

For Debian 7 'Wheezy', these problems have been fixed in version 3.2.84-2.

For Debian 8 'Jessie', these problems have been fixed in version 3.16.39-1+deb8u1 or earlier.

We recommend that you upgrade your linux packages.

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

Linux カーネルに、権限昇格、サービス拒否、またはその他の影響をもたらす可能性がある、いくつかの脆弱性が発見されました。CVE-2014-9888 : Russell King 氏は、ARM システムでは、DMA バッファに割り当てられたメモリが実行権限によってマップされていることを発見しました。これにより、カーネルの他の脆弱性を悪用しやすくなります。CVE-2014-9895 : Dan Carpenter 氏は、メディアデバイスの MEDIA_IOC_ENUM_LINKS ioctl によって情報漏洩が発生したことを発見しました。CVE-2016-6786 / CVE-2016-6787 : 特定の移行中にパフォーマンスイベントサブシステムが適切にロックを管理せず、ローカルの攻撃者が権限を昇格できることが判明されました。これは、パフォーマンスイベントの権限のない使用を無効にすることで軽減できます : sysctl kernel.perf_event_paranoid=3。CVE-2016-8405 : Trend Micro の Peter Pi 氏は、カラーマップをユーザー空間にコピーする際に、フレームバッファービデオサブシステムが適切に境界をチェックせず、ヒープバッファーの領域外読み込みが発生し、情報開示につながることを発見しました。CVE-2017-5549 : KLSI KL5KUSB105 シリアル USB デバイスドライバーが初期化されていないカーネルメモリの内容を記録し、情報漏洩を引き起こす可能性があることが発見されました。CVE-2017-6001 : Di Shen 氏は、パフォーマンスイベントサブシステムへの同時呼び出し間の競合状態により、ローカルの攻撃者が権限を昇格させる可能性があることを発見しました。この問題は、CVE-2016-6786 の修正が不完全なために存在します。これは、パフォーマンスイベントの権限のない使用を無効にすることで軽減できます : sysctl kernel.perf_event_paranoid=3。CVE-2017-6074 : Andrey Konovalov 氏は、DCCP ネットワーキングコードで、サービス拒否またはローカルの権限昇格を引き起こす use-after-free の脆弱性を発見しました。dccp モジュールがまだロードされていないシステムでは、これを無効にすることで緩和できます : echo >> /etc/modprobe.d/disable-dccp.conf インストール dccp false Debian 7 'Wheezy' では、これらの問題はバージョン 3.2.84-2 で修正されています。Debian 8 'Jessie' では、これらの問題はバージョン 3.16.39-1+deb8u1 以前で修正されています。お使いの linux パッケージをアップグレードすることを推奨します。注 : Tenable Network Security は、前述の記述ブロックを DLA セキュリティアドバイザリから直接抽出しています。Tenableでは、新たな問題を持ち込まずに、できる限り自動的に整理して書式設定するようにしています。

在 Linux 内核中发现多个可能导致权限升级、拒绝服务或造成其他影响的漏洞。CVE-2014-9888 Russell King 发现 ARM 系统上分配给 DMA 缓冲区的内存已映射为具有可执行权限。这使得内核中的其他漏洞更加容易利用。CVE-2014-9895 Dan Carpenter 发现媒体设备上的 MEDIA_IOC_ENUM_LINKS ioctl 导致信息泄露。CVE-2016-6786 / CVE-2016-6787 已发现性能事件子系统在某些迁移期间无法正确管理锁，从而允许本地攻击者升级权限。此问题可以通过禁用性能事件的非特权使用来缓解：sysctl kernel.perf_event_paranoid = 3 CVE-2016-8405 Trend Micro 的 Peter Pi 发现，在将颜色映射复制到用户空间时，帧缓冲区视频子系统未正确检查边界，导致堆缓冲区越界读取，从而造成信息泄露。CVE-2017-5549 已发现 KLSI KL5KUSB105 串行 USB 设备驱动程序可记录未初始化内核内存内容，从而造成信息泄露。CVE-2017-6001 Di Shen 发现并发调用性能事件子系统之间存在争用条件，可允许本地攻击者升级权限。存在此缺陷的原因是 CVE-2016-6786 的修复不完整。此问题可通过禁用性能事件的非特权使用来缓解：sysctl kernel.perf_event_paranoid = 3 CVE-2017-6074 Andrey Konovalov 在 DCCP 网络代码中发现一个释放后使用漏洞，可导致拒绝服务或本地权限升级。在尚未加载 dccp 模块的系统上，此问题可通过禁用此模块来缓解：echo >> /etc/modprobe.d/disable-dccp.conf install dccp false 对于 Debian 7“Wheezy”，这些问题已在版本 3.2.84-2 中修复。对于 Debian 8“Jessie”，这些问题已在 3.16.39-1+deb8u1 或更低版本中修复。建议您升级 linux 程序包。注意：Tenable Network Security 已直接从 DLA 安全公告中提取上述描述块。Tenable 已尝试在不引入其他问题的情况下，尽可能进行自动整理和排版。

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 IPv6 SCTP implementation in net/sctp/ipv6.c in the     Linux kernel through 3.11.1 uses data structures and     function calls that do not trigger an intended     configuration of IPsec encryption, which allows remote     attackers to obtain sensitive information by sniffing     the network.(CVE-2013-4350i1/4%0

  - The sg_ioctl function in drivers/scsi/sg.c in the Linux     kernel allows local users to cause a denial of service     (stack-based buffer overflow) or possibly have     unspecified other impacts via a large command size in     an SG_NEXT_CMD_LEN ioctl call, leading to out-of-bounds     write access in the sg_write function.(CVE-2017-7187i1/4%0

  - An issue was discovered in can_can_gw_rcv in     net/can/gw.c in the Linux kernel through 4.19.13. The     CAN frame modification rules allow bitwise logical     operations that can be also applied to the can_dlc     field. Because of a missing check, the CAN drivers may     write arbitrary content beyond the data registers in     the CAN controller's I/O memory when processing can-gw     manipulated outgoing frames. This is related to     cgw_csum_xor_rel. An unprivileged user can trigger a     system crash (general protection     fault).(CVE-2019-3701i1/4%0

  - net/rds/sysctl.c in the Linux kernel before 3.19 uses     an incorrect data type in a sysctl table, which allows     local users to obtain potentially sensitive information     from kernel memory or possibly have unspecified other     impact by accessing a sysctl entry.(CVE-2015-2042i1/4%0

  - The inet_csk_clone_lock function in     net/ipv4/inet_connection_sock.c in the Linux kernel     allows attackers to cause a denial of service (double     free) or possibly have unspecified other impact by     leveraging use of the accept system call. An     unprivileged local user could use this flaw to induce     kernel memory corruption on the system, leading to a     crash. Due to the nature of the flaw, privilege     escalation cannot be fully ruled out, although we     believe it is unlikely.(CVE-2017-8890i1/4%0

  - The overlayfs implementation in the linux (aka Linux     kernel) package before 3.19.0-21.21 in Ubuntu through     15.04 does not properly check permissions for file     creation in the upper filesystem directory, which     allows local users to obtain root access by leveraging     a configuration in which overlayfs is permitted in an     arbitrary mount namespace.(CVE-2015-1328i1/4%0

  - The xfs_dinode_verify function in     fs/xfs/libxfs/xfs_inode_buf.c in the Linux kernel     through 4.16.3 allows local users to cause a denial of     service (xfs_ilock_attr_map_shared invalid pointer     dereference) via a crafted xfs image.(CVE-2018-10322i1/4%0

  - In the flush_tmregs_to_thread function in     arch/powerpc/kernel/ptrace.c in the Linux kernel before     4.13.5, a guest kernel crash can be triggered from     unprivileged userspace during a core dump on a POWER     host due to a missing processor feature check and an     erroneous use of transactional memory (TM) instructions     in the core dump path, leading to a denial of     service.(CVE-2018-1091i1/4%0

  - ** DISPUTED ** drivers/scsi/libsas/sas_scsi_host.c in     the Linux kernel before 4.16 allows local users to     cause a denial of service (ata qc leak) by triggering     certain failure conditions. NOTE: a third party     disputes the relevance of this report because the     failure can only occur for physically proximate     attackers who unplug SAS Host Bus Adapter     cables.(CVE-2018-10021i1/4%0

  - 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-2016-0723i1/4%0

  - An out-of-bounds read flaw was found in the way the     Logitech Unifying receiver driver handled HID reports     with an invalid device_index value. An attacker with     physical access to the system could use this flaw to     crash the system or, potentially, escalate their     privileges on the system.(CVE-2014-3182i1/4%0

  - arch/x86/kvm/emulate.c in the Linux kernel through     4.9.3 allows local users to obtain sensitive     information from kernel memory or cause a denial of     service (use-after-free) via a crafted application that     leverages instruction emulation for fxrstor, fxsave,     sgdt, and sidt.(CVE-2017-2584i1/4%0

  - A flaw was found in the way the Linux kernel handled     IRET faults during the processing of NMIs. An     unprivileged, local user could use this flaw to crash     the system or, potentially (although highly unlikely),     escalate their privileges on the     system.(CVE-2015-5157i1/4%0

  - drivers/media/media-device.c in the Linux kernel before     3.11, as used in Android before 2016-08-05 on Nexus 5     and 7 (2013) devices, does not properly initialize     certain data structures, which allows local users to     obtain sensitive information via a crafted application,     aka Android internal bug 28750150 and Qualcomm internal     bug CR570757, a different vulnerability than     CVE-2014-1739.(CVE-2014-9895i1/4%0

  - A use-after-free vulnerability in sys_ioprio_get() was     found due to get_task_ioprio() accessing the     task-i1/4zio_context without holding the task lock and     could potentially race with exit_io_context(), leading     to a use-after-free.(CVE-2016-7911i1/4%0

  - A flaw was found in the Linux kernel which is related     to the user namespace lazily unmounting file systems.
    The fs_pin struct has two members (m_list and s_list)     which are usually initialized on use in the     pin_insert_group function. However, these members might     go unmodified in this case, the system panics when it     attempts to destroy or free them. This flaw could be     used to launch a denial-of-service     attack.(CVE-2015-4178i1/4%0

  - A flaw was found in the Linux kernel's implementation     of raw_sendmsg allowing a local attacker to panic the     kernel or possibly leak kernel addresses. A local     attacker, with the privilege of creating raw sockets,     can abuse a possible race condition when setting the     socket option to allow the kernel to automatically     create ip header values and thus potentially escalate     their privileges.(CVE-2017-17712i1/4%0

  - A flaw was discovered in the F2FS filesystem code in     fs/f2fs/super.c in the Linux kernel. A denial of     service, due to an out-of-bounds memory access, can     occur upon encountering an abnormal bitmap size when     mounting a crafted f2fs image.(CVE-2018-13096i1/4%0

  - A NULL pointer dereference flaw was found in the way     the Linux kernel's madvise MADV_WILLNEED functionality     handled page table locking. A local, unprivileged user     could use this flaw to crash the     system.(CVE-2014-8173i1/4%0

  - An out-of-bounds heap memory access leading to a Denial     of Service, heap disclosure, or further impact was     found in setsockopt(). The function call is normally     restricted to root, however some processes with     cap_sys_admin may also be able to trigger this flaw in     privileged container environments.(CVE-2016-4998i1/4%0

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 :

  - A flaw was found in the way the Linux kernel's Crypto     subsystem handled automatic loading of kernel modules.
    A local user could use this flaw to load any installed     kernel module, and thus increase the attack surface of     the running kernel.(CVE-2014-9644)

  - The Btrfs implementation in the Linux kernel before     3.19 does not ensure that the visible xattr state is     consistent with a requested replacement, which allows     local users to bypass intended ACL settings and gain     privileges via standard filesystem operations (1)     during an xattr-replacement time window, related to a     race condition, or (2) after an xattr-replacement     attempt that fails because the data does not     fit.(CVE-2014-9710)

  - An integer overflow flaw was found in the way the Linux     kernel's netfilter connection tracking implementation     loaded extensions. An attacker on a local network could     potentially send a sequence of specially crafted     packets that would initiate the loading of a large     number of extensions, causing the targeted system in     that network to crash.(CVE-2014-9715)

  - A symlink size validation was missing in Linux kernels     built with UDF file system (CONFIG_UDF_FS) support,     allowing the corruption of kernel memory. An attacker     able to mount a corrupted/malicious UDF file system     image could cause the kernel to crash.(CVE-2014-9728)

  - A symlink size validation was missing in Linux kernels     built with UDF file system (CONFIG_UDF_FS) support,     allowing the corruption of kernel memory. An attacker     able to mount a corrupted/malicious UDF file system     image could cause the kernel to crash.(CVE-2014-9729)

  - A symlink size validation was missing in Linux kernels     built with UDF file system (CONFIG_UDF_FS) support,     allowing the corruption of kernel memory. An attacker     able to mount a corrupted/malicious UDF file system     image could cause the kernel to crash.(CVE-2014-9730)

  - A path length checking flaw was found in Linux kernels     built with UDF file system (CONFIG_UDF_FS) support. An     attacker able to mount a corrupted/malicious UDF file     system image could use this flaw to leak kernel memory     to user-space.(CVE-2014-9731)

  - The snd_compr_tstamp function in     sound/core/compress_offload.c in the Linux kernel     through 4.7, as used in Android before 2016-08-05 on     Nexus 5 and 7 (2013) devices, does not properly     initialize a timestamp data structure, which allows     attackers to obtain sensitive information via a crafted     application, aka Android internal bug 28770164 and     Qualcomm internal bug CR568717.(CVE-2014-9892)

  - drivers/media/media-device.c in the Linux kernel before     3.11, as used in Android before 2016-08-05 on Nexus 5     and 7 (2013) devices, does not properly initialize     certain data structures, which allows local users to     obtain sensitive information via a crafted application,     aka Android internal bug 28750150 and Qualcomm internal     bug CR570757, a different vulnerability than     CVE-2014-1739.(CVE-2014-9895)

  - The ethtool_get_wol function in net/core/ethtool.c in     the Linux kernel through 4.7, as used in Android before     2016-08-05 on Nexus 5 and 7 (2013) devices, does not     initialize a certain data structure, which allows local     users to obtain sensitive information via a crafted     application, aka Android internal bug 28803952 and     Qualcomm internal bug CR570754.(CVE-2014-9900)

  - 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)

  - A race condition in the ip4_datagram_release_cb     function in net/ipv4/datagram.c in the Linux kernel     allows local users to gain privileges or cause a denial     of service (use-after-free) by leveraging incorrect     expectations about locking during multithreaded access     to internal data structures for IPv4 UDP     sockets.(CVE-2014-9914)

  - A flaw was discovered in the way the kernel allows     stackable filesystems to overlay. A local attacker who     is able to mount filesystems can abuse this flaw to     escalate privileges.(CVE-2014-9922)

  - The regulator_ena_gpio_free function in     drivers/regulator/core.c in the Linux kernel allows     local users to gain privileges or cause a denial of     service (use-after-free) via a crafted     application.(CVE-2014-9940)

  - It was found that the Linux kernel KVM subsystem's     sysenter instruction emulation was not sufficient. An     unprivileged guest user could use this flaw to escalate     their privileges by tricking the hypervisor to emulate     a SYSENTER instruction in 16-bit mode, if the guest OS     did not initialize the SYSENTER model-specific     registers (MSRs). Note: Certified guest operating     systems for Red Hat Enterprise Linux with KVM do     initialize the SYSENTER MSRs and are thus not     vulnerable to this issue when running on a KVM     hypervisor.(CVE-2015-0239)

  - A flaw was found in the way the Linux kernel's XFS file     system handled replacing of remote attributes under     certain conditions. A local user with access to XFS     file system mount could potentially use this flaw to     escalate their privileges on the system.(CVE-2015-0274)

  - A flaw was found in the way the Linux kernel's ext4     file system handled the 'page size i1/4z block size'     condition when the fallocate zero range functionality     was used. A local attacker could use this flaw to crash     the system.(CVE-2015-0275)

  - It was found that the Linux kernel's keyring     implementation would leak memory when adding a key to a     keyring via the add_key() function. A local attacker     could use this flaw to exhaust all available memory on     the system.(CVE-2015-1333)

  - Race condition in the handle_to_path function in     fs/fhandle.c in the Linux kernel through 3.19.1 allows     local users to bypass intended size restrictions and     trigger read operations on additional memory locations     by changing the handle_bytes value of a file handle     during the execution of this function.(CVE-2015-1420)

  - A use-after-free flaw was found in the way the Linux     kernel's SCTP implementation handled authentication key     reference counting during INIT collisions. A remote     attacker could use this flaw to crash the system or,     potentially, escalate their privileges on the     system.(CVE-2015-1421)

  - The IPv4 implementation in the Linux kernel before     3.18.8 does not properly consider the length of the     Read-Copy Update (RCU) grace period for redirecting     lookups in the absence of caching, which allows remote     attackers to cause a denial of service (memory     consumption or system crash) via a flood of     packets.(CVE-2015-1465)

  - A flaw was found in the way the nft_flush_table()     function of the Linux kernel's netfilter tables     implementation flushed rules that were referencing     deleted chains. A local user who has the CAP_NET_ADMIN     capability could use this flaw to crash the     system.(CVE-2015-1573)

  - An integer overflow flaw was found in the way the Linux     kernel randomized the stack for processes on certain     64-bit architecture systems, such as x86-64, causing     the stack entropy to be reduced by four.(CVE-2015-1593)

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.

在 Linux 核心中發現數個弱點，這些弱點可能會導致權限提升、拒絕服務或造成其他影響。CVE-2014-9888 Russell King 發現 ARM 系統上配置給 DMA 緩衝區的記憶體，是以可執行檔權限進行對應。這會造成核心中其他弱點更容易遭到惡意利用。CVE-2014-9895 Dan Carpenter 發現媒體裝置上的 MEDIA_IOC_ENUM_LINKS ioctl 會造成資訊洩漏。CVE-2016-6786 / CVE-2016-6787 發現效能事件子系統在特定移轉期間並未正確管理鎖定項，造成本機攻擊者可藉此提升權限。此問題可藉由停用無權限使用效能事件來降低其安全性風險：sysctl kernel.perf_event_paranoid=3 CVE-2016-8405 Trend Micro 的 Peter Pi 發現框架緩衝區視訊子系統在將顏色對應表複製到使用者空間時，並未正確檢查邊界，造成發生堆積緩衝區超出邊界讀取，進而導致資訊洩漏。CVE-2017-5549 發現 KLSI KL5KUSB105 序列 USB 裝置驅動程式會記錄未初始化的核心記憶體內容，造成資訊洩漏。CVE-2017-6001 Di Shen 發現對效能事件子系統的並行呼叫間存在爭用情形，本機攻擊者可藉此提升權限。此缺陷是因為 CVE-2016-6786 的修正不完整所造成的。此問題可藉由停用無權限使用效能事件來降低其安全性風險：sysctl kernel.perf_event_paranoid=3 CVE-2017-6074 Andrey Konovalov 發現 DCCP 網路程式碼存在一個釋放後使用弱點，會造成拒絕服務或本機權限提升。在尚未載入 dccp 模組的系統上，可採用下列方式停用該模組以降低安全風險：echo >> /etc/modprobe.d/disable-dccp.conf install dccp false 針對 Debian 7「Wheezy」，這些問題已在 3.2.84-2 版本中修正。針對 Debian 8「Jessie」，這些問題已在 3.16.39-1+deb8u1 或更舊版本中修正。建議您升級 linux 套件。注意：Tenable Network Security 已直接從 DLA 安全性公告擷取前置描述區塊。Tenable 已盡量在不造成其他問題的前提下，嘗試自動清理並將其格式化。

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
97332	Debian DLA-833-1 : linux security update	Nessus	Debian Local Security Checks	2017/2/23	2021/1/11	high
97332	Debian DLA-833-1 : linux セキュリティ更新	Nessus	Debian Local Security Checks	2017/2/23	2021/1/11	high
97332	Debian DLA-833-1：linux 安全更新	Nessus	Debian Local Security Checks	2017/2/23	2021/1/11	high
124972	EulerOS Virtualization for ARM 64 3.0.1.0 : kernel (EulerOS-SA-2019-1519)	Nessus	Huawei Local Security Checks	2019/5/14	2022/5/20	high
124809	EulerOS Virtualization 3.0.1.0 : kernel (EulerOS-SA-2019-1485)	Nessus	Huawei Local Security Checks	2019/5/13	2024/5/23	high
97332	Debian DLA-833-1：linux 安全性更新	Nessus	Debian Local Security Checks	2017/2/23	2021/1/11	high

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