Felix Wilhelm discovered a race condition in the Xen paravirtualized drivers which can cause double fetch vulnerabilities. An attacker in the paravirtualized guest could exploit this flaw to cause a denial of service (crash the host) or potentially execute arbitrary code on the host. (CVE-2015-8550)

Konrad Rzeszutek Wilk discovered the Xen PCI backend driver does not perform sanity checks on the device's state. An attacker could exploit this flaw to cause a denial of service (NULL dereference) on the host.
(CVE-2015-8551)

Konrad Rzeszutek Wilk discovered the Xen PCI backend driver does not perform sanity checks on the device's state. An attacker could exploit this flaw to cause a denial of service by flooding the logging system with WARN() messages causing the initial domain to exhaust disk space.
(CVE-2015-8552).

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 multiple vulnerabilities as referenced in the USN-2853-1 advisory.

    Felix Wilhelm discovered a race condition in the Xen paravirtualized drivers which can cause double fetch     vulnerabilities. An attacker in the paravirtualized guest could exploit this flaw to cause a denial of     service (crash the host) or potentially execute arbitrary code on the host. (CVE-2015-8550)

    Konrad Rzeszutek Wilk discovered the Xen PCI backend driver does not perform consistency checks on the     device's state. An attacker could exploit this flaw to cause a denial of service (NULL dereference) on the     host. (CVE-2015-8551)

    Konrad Rzeszutek Wilk discovered the Xen PCI backend driver does not perform consistency checks on the     device's state. An attacker could exploit this flaw to cause a denial of service by flooding the logging     system with WARN() messages causing the initial domain to exhaust disk space. (CVE-2015-8552)

    Jann Horn discovered a ptrace issue with user namespaces in the Linux kernel. The namespace owner could     potentially exploit this flaw by ptracing a root owned process entering the user namespace to elevate its     privileges and potentially gain access outside of the namespace. (http://bugs.launchpad.net/bugs/1527374,     CVE-2015-8709)

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

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

Multiple security issues have been found in the Xen virtualisation solution, which may result in denial of service or information disclosure.

The oldstable distribution (wheezy) will be updated in a separate DSA.

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.

The openSUSE 13.2 kernel was updated to receive various security and bugfixes.

Following security bugs were fixed :

  - CVE-2016-0728: A reference leak in keyring handling with     join_session_keyring() could lead to local attackers     gain root privileges. (bsc#962075).

  - CVE-2015-7550: A local user could have triggered a race     between read and revoke in keyctl (bnc#958951).

  - 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-2015-8543: 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-2014-8989: The Linux kernel did not properly     restrict dropping of supplemental group memberships in     certain namespace scenarios, which allowed local users     to bypass intended file permissions by leveraging a     POSIX ACL containing an entry for the group category     that is more restrictive than the entry for the other     category, aka a 'negative groups' issue, related to     kernel/groups.c, kernel/uid16.c, and     kernel/user_namespace.c (bnc#906545).

  - CVE-2015-5157: arch/x86/entry/entry_64.S in the Linux     kernel on the x86_64 platform mishandles IRET faults in     processing NMIs that occurred during userspace     execution, which might allow local users to gain     privileges by triggering an NMI (bnc#937969).

  - CVE-2015-7799: The slhc_init function in     drivers/net/slip/slhc.c in the Linux kernel through     4.2.3 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-2015-8104: The KVM subsystem in the Linux kernel     through 4.2.6, and Xen 4.3.x through 4.6.x, allowed     guest OS users to cause a denial of service (host OS     panic or hang) by triggering many #DB (aka Debug)     exceptions, related to svm.c (bnc#954404).

  - CVE-2015-5307: The KVM subsystem in the Linux kernel     through 4.2.6, and Xen 4.3.x through 4.6.x, allowed     guest OS users to cause a denial of service (host OS     panic or hang) by triggering many #AC (aka Alignment     Check) exceptions, related to svm.c and vmx.c     (bnc#953527).

  - CVE-2014-9529: Race condition in the key_gc_unused_keys     function in security/keys/gc.c in the Linux kernel     allowed local users to cause a denial of service (memory     corruption or panic) or possibly have unspecified other     impact via keyctl commands that trigger access to a key     structure member during garbage collection of a key     (bnc#912202).

  - CVE-2015-7990: Race condition in the rds_sendmsg     function in net/rds/sendmsg.c in the Linux kernel     allowed local users to cause a denial of service (NULL     pointer dereference and system crash) or possibly have     unspecified other impact by using a socket that was not     properly bound. NOTE: this vulnerability exists because     of an incomplete fix for CVE-2015-6937 (bnc#952384     953052).

  - CVE-2015-6937: The __rds_conn_create function in     net/rds/connection.c in the Linux kernel allowed local     users to cause a denial of service (NULL pointer     dereference and system crash) or possibly have     unspecified other impact by using a socket that was not     properly bound (bnc#945825).

  - CVE-2015-7885: The dgnc_mgmt_ioctl function in     drivers/staging/dgnc/dgnc_mgmt.c in the Linux kernel     through 4.3.3 did not initialize a certain structure     member, which allowed local users to obtain sensitive     information from kernel memory via a crafted application     (bnc#951627).

  - 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 is (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. NOTE: the scope of CVE-2015-0272 is     limited to the NetworkManager product (bnc#955354).

  - CVE-2015-8767: A case can occur when sctp_accept() is     called by the user during a heartbeat timeout event     after the 4-way handshake. Since sctp_assoc_migrate()     changes both assoc->base.sk and assoc->ep, the     bh_sock_lock in sctp_generate_heartbeat_event() will be     taken with the listening socket but released with the     new association socket. The result is a deadlock on any     future attempts to take the listening socket lock.
    (bsc#961509)

  - CVE-2015-8575: Validate socket address length in     sco_sock_bind() to prevent information leak     (bsc#959399).

  - CVE-2015-8551, CVE-2015-8552: xen/pciback: For     XEN_PCI_OP_disable_msi[|x] only disable if device has     MSI(X) enabled (bsc#957990).

  - CVE-2015-8550: Compiler optimizations in the XEN PV     backend drivers could have lead to double fetch     vulnerabilities, causing denial of service or arbitrary     code execution (depending on the configuration)     (bsc#957988).

The following non-security bugs were fixed :

  - ALSA: hda - Disable 64bit address for Creative HDA     controllers (bnc#814440).

  - ALSA: hda - Fix noise problems on Thinkpad T440s     (boo#958504).

  - Input: aiptek - fix crash on detecting device without     endpoints (bnc#956708).

  - KEYS: Make /proc/keys unconditional if CONFIG_KEYS=y     (boo#956934).

  - KVM: x86: update masterclock values on TSC writes     (bsc#961739).

  - NFS: Fix a NULL pointer dereference of migration     recovery ops for v4.2 client (bsc#960839).

  - apparmor: allow SYS_CAP_RESOURCE to be sufficient to     prlimit another task (bsc#921949).

  - blktap: also call blkif_disconnect() when frontend     switched to closed (bsc#952976).

  - blktap: refine mm tracking (bsc#952976).

  - cdrom: Random writing support for BD-RE media     (bnc#959568).

  - genksyms: Handle string literals with spaces in     reference files (bsc#958510).

  - ipv4: Do not increase PMTU with Datagram Too Big message     (bsc#955224).

  - ipv6: distinguish frag queues by device for multicast     and link-local packets (bsc#955422).

  - ipv6: fix tunnel error handling (bsc#952579).

  - route: Use ipv4_mtu instead of raw rt_pmtu (bsc#955224).

  - uas: Add response iu handling (bnc#954138).

  - usbvision fix overflow of interfaces array (bnc#950998).

  - x86/evtchn: make use of PHYSDEVOP_map_pirq.

  - xen/pciback: Do not allow MSI-X ops if     PCI_COMMAND_MEMORY is not set (bsc#957990 XSA-157).

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
87529	Ubuntu 12.04 LTS : linux vulnerabilities (USN-2846-1)	Nessus	Ubuntu Local Security Checks	2015/12/21	2021/1/19	high
87536	Ubuntu 14.04 LTS : Linux kernel (Wily HWE) vulnerabilities (USN-2853-1)	Nessus	Ubuntu Local Security Checks	2015/12/21	2024/8/27	high
90030	Debian DSA-3519-1 : xen - security update	Nessus	Debian Local Security Checks	2016/3/21	2021/1/11	high
89022	SUSE SLED12 / SLES12 Security Update : kernel (SUSE-SU-2016:0585-1)	Nessus	SuSE Local Security Checks	2016/2/29	2021/1/6	high
88605	openSUSE Security Update : the Linux Kernel (openSUSE-2016-136)	Nessus	SuSE Local Security Checks	2016/2/8	2021/1/19	high

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