All Vulnerability Reports

USN-4041-1: Linux kernel update


Severity

Medium

Vendor

Canonical Ubuntu

Versions Affected

  • Canonical Ubuntu 16.04

Description

USN-4017-1 fixed vulnerabilities in the Linux kernel for Ubuntu. Unfortunately, the update introduced a regression that interfered with networking applications that setup very low SO_SNDBUF values. This update fixes the problem.

We apologize for the inconvenience.

Jonathan Looney discovered that the Linux kernel could be coerced into segmenting responses into multiple TCP segments. A remote attacker could construct an ongoing sequence of requests to cause a denial of service.

CVEs contained in this USN include: CVE-2019-11479

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 Pivotal Application Service or PCF Isolation Segment.
  • Pivotal Application Service includes vulnerable stemcells in the following releases:
    • 2.6.x versions prior to 2.6.3
    • 2.5.x versions prior to 2.5.8
    • 2.4.x versions prior to 2.4.12
    • 2.3.x versions prior to 2.3.15
  • PCF Isolation Segment includes vulnerable stemcells in the following releases:
    • 2.6.x versions prior to 2.6.2
    • 2.5.x versions prior to 2.5.7
    • 2.4.x versions prior to 2.4.11
    • 2.3.x versions prior to 2.3.15
  • Pivotal Operations Manager is vulnerable in the following releases:
    • 2.6.x versions prior to 2.6.2
    • 2.5.x versions prior to 2.5.9
    • 2.4.x versions prior to 2.4.16
    • 2.3.x versions prior to 2.3.22

Mitigation

Users of affected versions should apply the following mitigation:

  • The Cloud Foundry security team recommends upgrading BOSH to the affected OSS components listed here if applicable.
  • Upgrade Pivotal products that use earlier versions of CF components to new Pivotal releases using new versions linked above. On the Pivotal 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:
    • Pivotal Application Service: 2.6.3, 2.5.8, 2.4.12, 2.3.15
    • PCF Isolation Segment: 2.6.2, 2.5.7, 2.4.11, 2.3.15
    • Pivotal Operations Manager: 2.6.2, 2.5.9, 2.4.16, 2.3.22

References