Xen para-virtualized framebuffer (PVFB) message denial of service
| xen-pvfb-message-dos (42388) |  High Risk |
Description:
Xen is vulnerable to a buffer overflow, caused by improper bounds checking by the hypervisor's para-virtualized framebuffer (PVFB). A local attacker could exploit this vulnerability using a malformed frontend framebuffer description to crash the application or execute arbitrary code in the privileged domain (Dom0).
*CVSS:
| Base Score: | 4.6 |
| Access Vector: | Local |
| Access Complexity: | Low |
| Authentication: | None |
| Confidentiality Impact: | Partial |
| Integrity Impact: | Partial |
| Availability Impact: | Partial |
| Temporal Score: | 3.4 |
| Exploitability: | Unproven |
| Remediation Level: | Official-Fix |
| Report Confidence: | Confirmed |
Consequences:
Gain Privileges
Remedy:
Refer to RHSA-2008-0194 for patch, upgrade or suggested workaround information. See References.
References:
- Xen Web site: Xen Community.
- BID-29186: Xen Para-Virtualized Framebuffer Message Format Denial Of Service Vulnerability
- CVE-2008-1944: Buffer overflow in the backend framebuffer of XenSource Xen Para-Virtualized Framebuffer (PVFB) Message 3.0 through 3.0.3 allows local users to cause a denial of service (SDL crash) and possibly execute arbitrary code via bogus screen updates
- RHSA-2008-0194: Important: xen security and bug fix update
- SECTRACK ID: 1020009: Xen PVFB Format Validation Bug Lets Local Users Deny Service or Gain Elevated Privileges
Platforms Affected:
- RedHat Enterprise Linux 5 Server
- RedHat Enterprise Linux 5 Client
- RedHat Enterprise Linux 5
- RedHat RHEL Desktop Multi OS 5 Client
- RedHat RHEL Virtualization 5 Server
- XenSource Xen 3.0
- XenSource Xen 3.0.3
Reported:
May 13, 2008
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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.