All Vulnerability Reports

USN-4680-1: Linux kernel vulnerabilities

Severity

Medium

Vendor

VMware Tanzu

Versions Affected

• Canonical Ubuntu 16.04

Description

It was discovered that debugfs in the Linux kernel as used by blktrace contained a use-after-free in some situations. A privileged local attacker could possibly use this to cause a denial of service (system crash). (CVE-2019-19770)

It was discovered that a race condition existed in the binder IPC implementation in the Linux kernel, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2020-0423)

Daniele Antonioli, Nils Ole Tippenhauer, and Kasper Rasmussen discovered that legacy pairing and secure-connections pairing authentication in the Bluetooth protocol could allow an unauthenticated user to complete authentication without pairing credentials via adjacent access. A physically proximate attacker could use this to impersonate a previously paired Bluetooth device. (CVE-2020-10135)

It was discovered that the console keyboard driver in the Linux kernel contained a race condition. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2020-25656)

Minh Yuan discovered that the tty driver in the Linux kernel contained race conditions when handling fonts. A local attacker could possibly use this to expose sensitive information (kernel memory). (CVE-2020-25668)

Keyu Man discovered that the ICMP global rate limiter in the Linux kernel could be used to assist in scanning open UDP ports. A remote attacker could use to facilitate attacks on UDP based services that depend on source port randomization. (CVE-2020-25705)

Jinoh Kang discovered that the Xen event channel infrastructure in the Linux kernel contained a race condition. An attacker in guest could possibly use this to cause a denial of service (dom0 crash). (CVE-2020-27675)

Daniel Axtens discovered that PowerPC RTAS implementation in the Linux kernel did not properly restrict memory accesses in some situations. A privileged local attacker could use this to arbitrarily modify kernel memory, potentially bypassing kernel lockdown restrictions. (CVE-2020-27777)

Minh Yuan discovered that the framebuffer console driver in the Linux kernel did not properly handle fonts in some conditions. A local attacker could use this to cause a denial of service (system crash) or possibly expose sensitive information (kernel memory). (CVE-2020-28974)

CVEs contained in this USN include: CVE-2020-10135, CVE-2020-25705, CVE-2020-0423, CVE-2020-28974, CVE-2020-25656, CVE-2020-27675, CVE-2020-27777, CVE-2019-19770, CVE-2020-25668

Affected VMware Products and Versions

Severity is medium unless otherwise noted.

Vulnerable Cloud Foundry components individually listed here.

Impacted stemcells may be updated independently of upgrading Tanzu Application Service or Isolation Segment.

• Isolation Segment
  • 2.7.x versions with Xenial Stemcells prior to 456.133
  • 2.8.x versions with Xenial Stemcells prior to 621.97
  • 2.9.x versions with Xenial Stemcells prior to 621.97
  • 2.10.x versions with Xenial Stemcells prior to 621.97

• Operations Manager
  • 2.7 versions prior to 2.7.28
  • 2.9 versions prior to 2.9.16
  • 2.10 versions prior to 2.10.5

• VMware Tanzu Application Service for VMs
  • 2.7.x versions with Xenial Stemcells prior to 456.133
  • 2.8.x versions with Xenial Stemcells prior to 621.97
  • 2.9.x versions with Xenial Stemcells prior to 621.97
  • 2.10.x versions with Xenial Stemcells prior to 621.97

Mitigation

Users of affected products are strongly encouraged to follow the mitigation below. The Cloud Foundry security team recommends upgrading the affected OSS components listed here if applicable. Upgrade VMware Tanzu products that use earlier versions of CF components to new Tanzu releases using new versions linked above. On the Tanzu Network product page for each release, check the Depends On section and/or Release Notes for this information. Releases that have fixed this issue include:

• Isolation Segment
  • 2.7.x: Upgrade Xenial Stemcells to 456.133 or greater
  • 2.8.x: Upgrade Xenial Stemcells to 621.97 or greater
  • 2.9.x: Upgrade Xenial Stemcells to 621.97 or greater
  • 2.10.x: Upgrade Xenial Stemcells to 621.97 or greater

• Operations Manager
  • 2.7.28
  • 2.9.16
  • 2.10.5

• VMware Tanzu Application Service for VMs
  • 2.7.x: Upgrade Xenial Stemcells to 456.133 or greater
  • 2.8.x: Upgrade Xenial Stemcells to 621.97 or greater
  • 2.9.x: Upgrade Xenial Stemcells to 621.97 or greater
  • 2.10.x: Upgrade Xenial Stemcells to 621.97 or greater

References

• https://people.canonical.com/~ubuntu-security/cve/CVE-2020-10135
• https://people.canonical.com/~ubuntu-security/cve/CVE-2020-25705
• https://people.canonical.com/~ubuntu-security/cve/CVE-2020-0423
• https://people.canonical.com/~ubuntu-security/cve/CVE-2020-28974
• https://people.canonical.com/~ubuntu-security/cve/CVE-2020-25656
• https://people.canonical.com/~ubuntu-security/cve/CVE-2020-27675
• https://people.canonical.com/~ubuntu-security/cve/CVE-2020-27777
• https://people.canonical.com/~ubuntu-security/cve/CVE-2019-19770
• https://people.canonical.com/~ubuntu-security/cve/CVE-2020-25668
• https://ubuntu.com/security/notices/USN-4680-1
• https://cloudfoundry.org/blog/usn-4680-1

History

2021-03-01: Initial vulnerability report published.