USN-5259-2: Cron vulnerabilities | Cloud Foundry

Severity

Low

Vendor

Canonical Ubuntu

Versions Affected

• Canonical Ubuntu 18.04

Description

USN-5259-1 fixed several vulnerabilities in Cron. This update provides the corresponding update for Ubuntu 18.04 LTS. Original advisory details: It was discovered that the postinst maintainer script in Cron unsafely handled file permissions during package install or update operations. An attacker could possibly use this issue to perform a privilege escalation attack. (CVE-2017-9525) Florian Weimer discovered that Cron incorrectly handled certain memory operations during crontab file creation. An attacker could possibly use this issue to cause a denial of service. (CVE-2019-9704) It was discovered that Cron incorrectly handled user input during crontab file creation. An attacker could possibly use this issue to cause a denial of service. (CVE-2019-9705) It was discovered that Cron contained a use-after-free vulnerability in its force_rescan_user function. An attacker could possibly use this issue to cause a denial of service. (CVE-2019-9706) Update Instructions: Run sudo ua fix USN-5259-2 to fix the vulnerability. The problem can be corrected by updating your system to the following package versions: cron – 3.0pl1-128.1ubuntu1.1 No subscription required

CVEs contained in this USN include: CVE-2017-9525, CVE-2019-9704, CVE-2019-9705, CVE-2019-9706.

Affected Cloud Foundry Products and Versions

Severity is low unless otherwise noted.

• Bionic Stemcells
  • 1.x versions prior to 1.84
  • All other stemcells not listed.
• cflinuxfs3
  • All versions prior to 0.293.0
• CF Deployment
  • All versions prior to 21.0.0, or later versions with Bionic Stemcells prior to 1.84

Mitigation

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

• Bionic Stemcells
  • Upgrade 1.x versions to 1.84 or greater
  • All other stemcells should be upgraded to the latest version available on bosh.io.
• cflinuxfs3
  • Upgrade all versions to 0.293.0 or greater
• CF Deployment
  • Upgrade all versions to 21.0.0 or greater and upgrade Bionic Stemcells to 1.84 or greater

References

• USN Notice
• VMware Tanzu Disclosure
• CVE-2017-9525
• CVE-2019-9704
• CVE-2019-9705
• CVE-2019-9706

History

2022-07-29: Initial vulnerability report published.