USN-4246-1: zlib vulnerabilities

Severity

Low

Vendor

Canonical Ubuntu

Description

It was discovered that zlib incorrectly handled pointer arithmetic. An attacker could use this issue to cause zlib to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2016-9840, CVE-2016-9841)

It was discovered that zlib incorrectly handled vectors involving left shifts of negative integers. An attacker could use this issue to cause zlib to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2016-9842)

It was discovered that zlib incorrectly handled vectors involving big-endian CRC calculation. An attacker could use this issue to cause zlib to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2016-9843)

CVEs contained in this USN include: CVE-2016-9840, CVE-2016-9841, CVE-2016-9842, CVE-2016-9843.

Affected Cloud Foundry Products and Versions

Severity is low unless otherwise noted.

• Xenial Stemcells
  • 621.x versions prior to 621.55
  • 456.x versions prior to 456.96
  • 315.x versions prior to 315.167
  • 250.x versions prior to 250.181
  • 170.x versions prior to 170.201
  • 97.x versions prior to 97.230
  • All other stemcells not listed.

Mitigation

Users of affected products are strongly encouraged to follow the mitigations below. The Cloud Foundry project recommends upgrading the following releases:

• Xenial Stemcells
  • Upgrade 621.x versions to 621.55 or greater
  • Upgrade 456.x versions to 456.96 or greater
  • Upgrade 315.x versions to 315.167 or greater
  • Upgrade 250.x versions to 250.181 or greater
  • Upgrade 170.x versions to 170.201 or greater
  • Upgrade 97.x versions to 97.230 or greater
  • All other stemcells should be upgraded to the latest version available on bosh.io.

History

2020-01-22: Initial vulnerability report published.