The xenlight library (libxl) in Xen 4.0.x through 4.2.x, when IOMMU is disabled, provides access to a busmastering-capable PCI passthrough device before the IOMMU setup is complete, which allows local HVM guest domains to gain privileges or cause a denial of service via a DMA instruction.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2013-4329 from the MITRE CVE dictionary dictionary and NIST NVD.
Not vulnerable.
This issue does not affect the versions of the xen package as shipped with Red Hat Enterprise Linux 5 as it does not provide support for the libxl toolstack.
This issue does not affect Red Hat Enterprise Linux 6 and Red Hat Enterprise MRG 2.
NOTE: The following CVSS v2 metrics and score provided are preliminary and subject to review.
| Base Score | 6.5 |
|---|---|
| Base Metrics | AV:A/AC:H/Au:S/C:C/I:C/A:C |
| Access Vector | Adjacent Network |
| Access Complexity | High |
| Authentication | Single |
| Confidentiality Impact | Complete |
| Integrity Impact | Complete |
| Availability Impact | Complete |
Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).
| Platform | Package | State |
|---|---|---|
| Red Hat Enterprise Linux 5 | xen | Not affected |
Vulmon