USN-4001-1: libseccomp vulnerability
Severity
Medium
Vendor
Canonical Ubuntu
Versions Affected
- Canonical Ubuntu 16.04
- Canonical Ubuntu 18.04
Description
Jann Horn discovered that libseccomp did not correctly generate 64-bit syscall argument comparisons with arithmetic operators (LT, GT, LE, GE). An attacker could use this to bypass intended access restrictions for argument-filtered system calls.
CVEs contained in this USN include: CVE-2019-9893
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 315.36
- 250.x versions prior to 250.58
- 170.x versions prior to 170.78
- 97.x versions prior to 97.108
- All other stemcells not listed.
- All versions of Cloud Foundry cflinuxfs3 prior to 0.94.0
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 315.36
- Upgrade 250.x versions to 250.58
- Upgrade 170.x versions to 170.78
- Upgrade 97.x versions to 97.108
- All other stemcells should be upgraded to the latest version available on bosh.io.
- The Cloud Foundry project recommends that Cloud Foundry deployments run with cflinuxfs3 version 0.94.0 or later.
