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USN-4660-1: Linux kernel vulnerabilities


Severity

Medium

Vendor

Canonical Ubuntu

Versions Affected
  • Canonical Ubuntu 16.04
Description

It was discovered that a race condition existed in the perf subsystem of the Linux kernel, leading to a use-after-free vulnerability. An attacker with access to the perf subsystem could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2020-14351)

It was discovered that the frame buffer implementation in the Linux kernel did not properly handle some edge cases in software scrollback. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2020-14390)

It was discovered that the netfilter connection tracker for netlink in the Linux kernel did not properly perform bounds checking in some situations. A local attacker could use this to cause a denial of service (system crash). (CVE-2020-25211)

It was discovered that the Rados block device (rbd) driver in the Linux kernel did not properly perform privilege checks for access to rbd devices in some situations. A local attacker could use this to map or unmap rbd block devices. (CVE-2020-25284)

It was discovered that a race condition existed in the hugetlb sysctl implementation in the Linux kernel. A privileged attacker could use this to cause a denial of service (system crash). (CVE-2020-25285)

It was discovered that the block layer subsystem in the Linux kernel did not properly handle zero-length requests. A local attacker could use this to cause a denial of service. (CVE-2020-25641)

It was discovered that the HDLC PPP implementation in the Linux kernel did not properly validate input in some situations. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2020-25643)

It was discovered that the GENEVE tunnel implementation in the Linux kernel when combined with IPSec did not properly select IP routes in some situations. An attacker could use this to expose sensitive information (unencrypted network traffic). (CVE-2020-25645)

It was discovered that the framebuffer implementation in the Linux kernel did not properly perform range checks in certain situations. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2020-28915)

It was discovered that Power 9 processors could be coerced to expose information from the L1 cache in certain situations. A local attacker could use this to expose sensitive information. (CVE-2020-4788)

CVEs contained in this USN include: CVE-2020-25285, CVE-2020-25641, CVE-2020-28915, CVE-2020-4788, CVE-2020-14351, CVE-2020-25284, CVE-2020-25211, CVE-2020-25645, CVE-2020-25643, CVE-2020-14390

Affected VMware Products and Versions

Severity is medium unless otherwise noted.

Vulnerable Cloud Foundry components individually listed here. Impacted stemcells may be updated independently of upgrading Tanzu Application Service or Isolation Segment.

  • Isolation Segment
    • 2.7.x versions prior to 2.7.29
    • 2.8.x versions prior to 2.8.23
    • 2.9.x versions prior to 2.9.17
    • 2.10.x versions prior to 2.10.9
  • Operations Manager
    • 2.7 versions prior to 2.7.26
    • 2.9 versions prior to 2.9.14
    • 2.10 versions prior to 2.10.4
  • VMware Tanzu Application Service for VMs
    • 2.7.x versions prior to 2.7.30
    • 2.8.x versions prior to 2.8.24
    • 2.9.x versions prior to 2.9.18
    • 2.10.x versions prior to 2.10.10
Mitigation

Users of affected products are strongly encouraged to follow the mitigation below. The Cloud Foundry security team recommends upgrading the affected OSS components listed here if applicable. Upgrade VMware Tanzu products that use earlier versions of CF components to new Tanzu releases using new versions linked above. On the Tanzu Network product page for each release, check the Depends On section and/or Release Notes for this information. Releases that have fixed this issue include:

  • Isolation Segment
    • 2.7.29
    • 2.8.23
    • 2.9.17
    • 2.10.9
  • Operations Manager
    • 2.7.26
    • 2.9.14
    • 2.10.4
  • VMware Tanzu Application Service for VMs
    • 2.7.30
    • 2.8.24
    • 2.9.18
    • 2.10.10
References
History

2021-01-13: Initial vulnerability report published.