The NetKVM Windows Virtio driver allows remote attackers to cause a denial of service (guest crash) via a crafted length value in an IP packet, as demonstrated by a value that does not account for the size of the IP options.

The remote Redhat Enterprise Linux 5 host has one or more packages installed that are affected by a vulnerability that has been acknowledged by the vendor but will not be patched.

  - virtio-win: netkvm: malformed packet can cause BSOD (CVE-2015-3215)

Note that Nessus has not tested for this issue but has instead relied on the package manager's report that the package is installed.

An updated virtio-win package that fixes one security issue and two bugs is now available for Red Hat Enterprise Linux 7 Supplementary.

Red Hat Product Security has rated this update as having Important security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.

The virtio-win package provides paravirtualized network drivers for most Microsoft Windows operating systems. Paravirtualized drivers are virtualization-aware drivers used by fully virtualized guests running on Red Hat Enterprise Linux. Fully virtualized guests using the paravirtualized drivers gain significantly better I/O performance than fully virtualized guests running without the drivers.

It was found that the Windows Virtio NIC driver did not sufficiently sanitize the length of the incoming IP packets, as demonstrated by a packet with IP options present but the overall packet length not being adjusted to reflect the length of those options. A remote attacker able to send a specially crafted IP packet to the guest could use this flaw to crash that guest. (CVE-2015-3215)

Red Hat would like to thank Google Project Zero for reporting this issue.

This update also fixes the following bugs :

* When creating a Windows guest using virtio drivers and direct Logical Unit Number (LUN) access with more than 4 SCSI disks under one virtio-scsi-pci controller, the guest terminated unexpectedly with a stop error, also known as the blue screen of death. This update increases the maximum amount of LUNs per a single virtio-scsi-pci controller has been increased to 254, which prevents the described crash from occurring. (BZ#1207546)

* The license.txt file in the virtio-win build has been updated to include the correct year number in the copyright information section.
(BZ#1183427)

All virtio-win users are advised to upgrade to this updated package, which contains backported patches to correct these issues.

An updated virtio-win package that fixes one security issue and two bugs is now available for Red Hat Enterprise Linux 6 Supplementary.

Red Hat Product Security has rated this update as having Important security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.

The virtio-win package provides paravirtualized network drivers for most Microsoft Windows operating systems. Paravirtualized drivers are virtualization-aware drivers used by fully virtualized guests running on Red Hat Enterprise Linux. Fully virtualized guests using the paravirtualized drivers gain significantly better I/O performance than fully virtualized guests running without the drivers.

It was found that the Windows Virtio NIC driver did not sufficiently sanitize the length of the incoming IP packets, as demonstrated by a packet with IP options present but the overall packet length not being adjusted to reflect the length of those options. A remote attacker able to send a specially crafted IP packet to the guest could use this flaw to crash that guest. (CVE-2015-3215)

Red Hat would like to thank Google Project Zero for reporting this issue.

This update also fixes the following bugs :

* When creating a Windows guest using virtio drivers and direct Logical Unit Number (LUN) access with more than 4 SCSI disks under one virtio-scsi-pci controller, the guest terminated unexpectedly with a stop error, also known as the blue screen of death. This update increases the maximum amount of LUNs per a single virtio-scsi-pci controller has been increased to 254, which prevents the described crash from occurring. (BZ#1210196)

* The license.txt file in the virtio-win build has been updated to include the correct year number in the copyright information section.
(BZ#1210195)

All virtio-win users are advised to upgrade to this updated package, which contains backported patches to correct these issues.

ID	Name	Product	Family	Severity
199302	RHEL 5 : virtio-win (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	high
83987	RHEL 7 : virtio-win (RHSA-2015:1044)	Nessus	Red Hat Local Security Checks	high
83986	RHEL 6 : virtio-win (RHSA-2015:1043)	Nessus	Red Hat Local Security Checks	high

Detections

Analytics

CVE-2015-3215

high

Tenable Plugins

high

high

high