USN-2778-1 Linux kernel vulnerabilities

Medium

Vendor

Vivid

Versions Affected

• Ubuntu 14.04

Description

It was discovered that the Linux kernel did not check if a new IPv6 MTU set by a user space application was valid. A remote attacker could forge a route advertisement with an invalid MTU that a user space daemon like NetworkManager would honor and apply to the kernel, causing a denial of service. (CVE-2015-0272)

It was discovered that virtio networking in the Linux kernel did not handle fragments correctly, leading to kernel memory corruption. A remote attacker could use this to cause a denial of service (system crash) or possibly execute code with administrative privileges. (CVE-2015-5156)

It was discovered that the Reliable Datagram Sockets (RDS) implementation in the Linux kernel did not verify sockets were properly bound before attempting to send a message, which could cause a NULL pointer dereference. An attacker could use this to cause a denial of service (system crash). (CVE-2015-6937)

Ben Hutchings discovered that the Advanced Union Filesystem (aufs) for the Linux kernel did not correctly handle references of memory mapped files from an aufs mount. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code with administrative privileges. (CVE-2015-7312)

The Cloud Foundry project released a BOSH stemcell version 3112 that has the patched version of the Linux kernel.

Affected Products and Versions

_Severity is medium unless otherwise noted.
_

• All versions of Cloud Foundry BOSH stemcells prior to 3112 have versions of the kernel vulnerable to USN-2778-1

Mitigation

Users of affected versions should apply the following mitigation:

• The Cloud Foundry project recommends that Cloud Foundry deployments run with BOSH stemcells 3112 or later versions.

Credit

Ben Hutchings

References

• <http://www.ubuntu.com/usn/usn-2778-1&gt;
• <https://bosh.io/stemcells&gt;
• <https://github.com/cloudfoundry/cf-release&gt;