Cloud Foundry Logo

USN-4127-1: Python vulnerabilities

By: | September 30, 2019

Share

USN-4127-1: Python vulnerabilities

Severity

Medium

Vendor

Canonical Ubuntu

Versions Affected

  • Canonical Ubuntu 16.04
  • Canonical Ubuntu 18.04

Description

It was discovered that Python incorrectly handled certain pickle files. An attacker could possibly use this issue to consume memory, leading to a denial of service. This issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2018-20406)

It was discovered that Python incorrectly validated the domain when handling cookies. An attacker could possibly trick Python into sending cookies to the wrong domain. (CVE-2018-20852)

Jonathan Birch and Panayiotis Panayiotou discovered that Python incorrectly handled Unicode encoding during NFKC normalization. An attacker could possibly use this issue to obtain sensitive information. (CVE-2019-9636, CVE-2019-10160)

Colin Read and Nicolas Edet discovered that Python incorrectly handled parsing certain X509 certificates. An attacker could possibly use this issue to cause Python to crash, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2019-5010)

It was discovered that Python incorrectly handled certain urls. A remote attacker could possibly use this issue to perform CRLF injection attacks. (CVE-2019-9740, CVE-2019-9947)

Sihoon Lee discovered that Python incorrectly handled the local_file: scheme. A remote attacker could possibly use this issue to bypass blacklist meschanisms. (CVE-2019-9948)

CVEs contained in this USN include: CVE-2018-20406, CVE-2019-9636, CVE-2019-9740, CVE-2019-9947, CVE-2019-9948, CVE-2018-20852, CVE-2019-10160, CVE-2019-5010

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

  • Cloud Foundry BOSH xenial-stemcells are vulnerable, including:
    • 456.x versions prior to 456.25
    • 315.x versions prior to 315.97
    • 250.x versions prior to 250.110
    • 170.x versions prior to 170.133
    • 97.x versions prior to 97.159
    • All other stemcells not listed.
  • All versions of Cloud Foundry cflinuxfs3 prior to 0.124.0

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 456.x versions to 456.25
    • Upgrade 315.x versions to 315.97
    • Upgrade 250.x versions to 250.110
    • Upgrade 170.x versions to 170.133
    • Upgrade 97.x versions to 97.159
    • 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 0.124.0 or later.

References

Cloud Foundry Foundation Security Team Profile Image

Cloud Foundry Foundation Security Team, AUTHOR

SEE ALL ARTICLES