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 Cloud Foundry Products and Versions
Severity is medium unless otherwise noted.
- Cloud Foundry BOSH xenial-stemcells are vulnerable, including:
- 315.x versions prior to 315.64
- 250.x versions prior to 250.79
- 170.x versions prior to 170.107
- 97.x versions prior to 97.132
- 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 xenial-stemcells:
- Upgrade 315.x versions to 315.64
- Upgrade 250.x versions to 250.79
- Upgrade 170.x versions to 170.107
- Upgrade 97.x versions to 97.132
- All other stemcells should be upgraded to the latest version available on bosh.io.
