USN-3932-2: Linux kernel (Xenial HWE) vulnerabilities

Severity

Medium

Vendor

Canonical Ubuntu

Versions Affected

• Canonical Ubuntu 14.04

Description

USN-3932-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement (HWE) kernel from Ubuntu 16.04 LTS for Ubuntu 14.04 LTS.

It was discovered that a race condition existed in the f2fs file system implementation in the Linux kernel. A local attacker could use this to cause a denial of service. (CVE-2017-18249)

Wen Xu discovered that the f2fs file system implementation in the Linux kernel did not properly validate metadata. An attacker could use this to construct a malicious f2fs image that, when mounted, could cause a denial of service (system crash). (CVE-2018-13097, CVE-2018-13099, CVE-2018-13100, CVE-2018-14614, CVE-2018-14616)

Wen Xu and Po-Ning Tseng discovered that btrfs file system implementation in the Linux kernel did not properly validate metadata. An attacker could use this to construct a malicious btrfs image that, when mounted, could cause a denial of service (system crash). (CVE-2018-14610, CVE-2018-14611, CVE-2018-14612, CVE-2018-14613)

Vasily Averin and Evgenii Shatokhin discovered that a use-after-free vulnerability existed in the NFS41+ subsystem when multiple network namespaces are in use. A local attacker in a container could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2018-16884)

It was discovered that a use-after-free vulnerability existed in the PPP over L2TP implementation in the Linux kernel. A privileged local attacker could use this to possibly execute arbitrary code. (CVE-2018-9517)

Shlomi Oberman, Yuli Shapiro, and Ran Menscher discovered an information leak in the Bluetooth implementation of the Linux kernel. An attacker within Bluetooth range could use this to expose sensitive information (kernel memory). (CVE-2019-3459, CVE-2019-3460)

Jann Horn discovered that the KVM implementation in the Linux kernel contained a use-after-free vulnerability. An attacker in a guest VM with access to /dev/kvm could use this to cause a denial of service (guest VM crash). (CVE-2019-6974)

Jim Mattson and Felix Wilhelm discovered a use-after-free vulnerability in the KVM subsystem of the Linux kernel, when using nested virtual machines. A local attacker in a guest VM could use this to cause a denial of service (system crash) or possibly execute arbitrary code in the host system. (CVE-2019-7221)

Felix Wilhelm discovered that an information leak vulnerability existed in the KVM subsystem of the Linux kernel, when nested virtualization is used. A local attacker could use this to expose sensitive information (host system memory to a guest VM). (CVE-2019-7222)

Jann Horn discovered that the mmap implementation in the Linux kernel did not properly check for the mmap minimum address in some situations. A local attacker could use this to assist exploiting a kernel NULL pointer dereference vulnerability. (CVE-2019-9213)

Muyu Yu discovered that the CAN implementation in the Linux kernel in some situations did not properly restrict the field size when processing outgoing frames. A local attacker with CAP_NET_ADMIN privileges could use this to execute arbitrary code. (CVE-2019-3701)

Vladis Dronov discovered that the debug interface for the Linux kernel’s HID subsystem did not properly validate passed parameters in some situations. A local privileged attacker could use this to cause a denial of service (infinite loop). (CVE-2019-3819)

CVEs contained in this USN include: CVE-2019-3459, CVE-2019-3460, CVE-2019-6974, CVE-2019-7222, CVE-2019-9213, CVE-2017-18249, CVE-2018-13097, CVE-2018-13099, CVE-2018-13100, CVE-2018-14610, CVE-2018-14611, CVE-2018-14612, CVE-2018-14613, CVE-2018-14614, CVE-2018-14616, CVE-2018-16884, CVE-2018-9517, CVE-2019-3701, CVE-2019-3819, CVE-2019-7221

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

• Cloud Foundry BOSH trusty-stemcells are vulnerable, including:
  • 3586.x versions prior to 3586.96
  • 3541.x versions prior to 3541.93
  • 3468.x versions prior to 3468.109
  • 3445.x versions prior to 3445.107
  • 3421.x versions prior to 3421.124
  • All other stemcells not listed.

Mitigation

Users of affected products are strongly encouraged to follow one of the mitigations below:

• The Cloud Foundry project recommends upgrading the following BOSH trusty-stemcells:
  • Upgrade 3586.x versions to 3586.96
  • Upgrade 3541.x versions to 3541.93
  • Upgrade 3468.x versions to 3468.109
  • Upgrade 3445.x versions to 3445.107
  • Upgrade 3421.x versions to 3421.124
  • All other stemcells should be upgraded to the latest version available on bosh.io.

References

• USN-3932-2
• CVE-2019-3459
• CVE-2019-3460
• CVE-2019-6974
• CVE-2019-7222
• CVE-2019-9213
• CVE-2017-18249
• CVE-2018-13097
• CVE-2018-13099
• CVE-2018-13100
• CVE-2018-14610
• CVE-2018-14611
• CVE-2018-14612
• CVE-2018-14613
• CVE-2018-14614
• CVE-2018-14616
• CVE-2018-16884
• CVE-2018-9517
• CVE-2019-3701
• CVE-2019-3819
• CVE-2019-7221