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USN-4008-2: AppArmor update


Severity

Medium

Vendor

Canonical Ubuntu

Versions Affected
  • Canonical Ubuntu 16.04
Description

USN-4008-1 fixed multiple security issues in the Linux kernel. This update provides the corresponding changes to AppArmor policy for correctly operating under the Linux kernel with fixes for CVE-2019-11190. Without these changes, some profile transitions may be unintentionally denied due to missing mmap (’m’) rules.

Original advisory details:

Robert Święcki discovered that the Linux kernel did not properly apply Address Space Layout Randomization (ASLR) in some situations for setuid elf binaries. A local attacker could use this to improve the chances of exploiting an existing vulnerability in a setuid elf binary. (CVE-2019-11190)

It was discovered that a null pointer dereference vulnerability existed in the LSI Logic MegaRAID driver in the Linux kernel. A local attacker could use this to cause a denial of service (system crash). (CVE-2019-11810)

It was discovered that a race condition leading to a use-after-free existed in the Reliable Datagram Sockets (RDS) protocol implementation in the Linux kernel. The RDS protocol is blacklisted by default in Ubuntu. If enabled, a local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2019-11815)

Federico Manuel Bento discovered that the Linux kernel did not properly apply Address Space Layout Randomization (ASLR) in some situations for setuid a.out binaries. A local attacker could use this to improve the chances of exploiting an existing vulnerability in a setuid a.out binary. (CVE-2019-11191)

As a hardening measure, this update disables a.out support.

CVEs contained in this USN include: CVE-2019-11190, CVE-2019-11191, CVE-2019-11810, CVE-2019-11815

Affected Pivotal Products and Versions

Severity is medium unless otherwise noted.

Vulnerable Cloud Foundry components individually listed here. Impacted stemcells may be updated independently of upgrading Pivotal Application Service, Pivotal Container Service, or PCF Isolation Segment.

  • Pivotal Application Service
    • 2.6.x versions prior to 2.6.1
    • 2.5.x versions prior to 2.5.6
    • 2.4.x versions prior to 2.4.10
    • 2.3.x versions prior to 2.3.14
  • PCF Isolation Segment
    • 2.6.x versions prior to 2.6.1
    • 2.5.x versions prior to 2.5.6
    • 2.4.x versions prior to 2.4.10
    • 2.3.x versions prior to 2.3.14
  • Pivotal Operations Manager
    • 2.6.x versions prior to 2.6.1
    • 2.5.x versions prior to 2.5.7
    • 2.4.x versions prior to 2.4.14
    • 2.3.x versions prior to 2.3.21
  • PCF Container Service
    • 1.3.x versions prior to 1.3.8
    • 1.4.x versions prior to 1.4.2
Mitigation

Users of affected products are strongly encouraged to follow one of the mitigations below. The Cloud Foundry security team recommends upgrading BOSH to the affected OSS components listed here if applicable. Upgrade Pivotal products that use earlier versions of CF components to new Pivotal releases using new versions linked above. On the Pivotal 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.

  • Pivotal Application Service
    • 2.6.1
    • 2.5.6
    • 2.4.10
    • 2.3.14
  • PCF Isolation Segment
    • 2.6.1
    • 2.5.6
    • 2.4.10
    • 2.3.14
  • Pivotal Operations Manager
    • 2.6.1
    • 2.5.7
    • 2.4.14
    • 2.3.21
  • Pivotal Container Service
    • 1.3.8
    • 1.4.2
References
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