USN-3741-2: Linux kernel (Xenial HWE) vulnerabilities


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USN-3741-2: Linux kernel (Xenial HWE) vulnerabilities

Severity

High

Vendor

Canonical Ubuntu

Versions Affected

  • Canonical Ubuntu 14.04

Description

USN-3741-1 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 memory present in the L1 data cache of an Intel CPU core may be exposed to a malicious process that is executing on the CPU core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local attacker in a guest virtual machine could use this to expose sensitive information (memory from other guests or the host OS). (CVE-2018-3646)

It was discovered that memory present in the L1 data cache of an Intel CPU core may be exposed to a malicious process that is executing on the CPU core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local attacker could use this to expose sensitive information (memory from the kernel or other processes). (CVE-2018-3620)

Juha-Matti Tilli discovered that the TCP implementation in the Linux kernel performed algorithmically expensive operations in some situations when handling incoming packets. A remote attacker could use this to cause a denial of service. (CVE-2018-5390)

Juha-Matti Tilli discovered that the IP implementation in the Linux kernel performed algorithmically expensive operations in some situations when handling incoming packet fragments. A remote attacker could use this to cause a denial of service. (CVE-2018-5391)

Affected Cloud Foundry Products and Versions

Severity is high unless otherwise noted.

  • Cloud Foundry BOSH stemcells are vulnerable, including:
    • 3363.x versions prior to 3363.72
    • 3421.x versions prior to 3421.79
    • 3445.x versions prior to 3445.64
    • 3468.x versions prior to 3468.64
    • 3541.x versions prior to 3541.44
    • 3586.x versions prior to 3586.36
    • All other stemcells not listed.

Mitigation

OSS users are strongly encouraged to follow one of the mitigations below:

  • The Cloud Foundry project recommends upgrading the following BOSH stemcells:
    • Upgrade 3363.x versions to 3363.72
    • Upgrade 3421.x versions to 3421.79
    • Upgrade 3445.x versions to 3445.64
    • Upgrade 3468.x versions to 3468.64
    • Upgrade 3541.x versions to 3541.44
    • Upgrade 3586.x versions to 3586.36
    • All other stemcells should be upgraded to the latest version available on bosh.io.

References

Cloud Foundry Foundation Security Team Profile Image

Cloud Foundry Foundation Security Team, AUTHOR

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