Citrix XenServer Multiple Vulnerabilities (CTX200892)
Medium Nessus Plugin ID 83163
SynopsisThe remote host is missing a vendor-supplied security patch.
DescriptionThe version of Citrix XenServer installed on the remote host is affected by multiple vulnerabilities :
- A flaw exists in the VGA emulator in QEMU that allows a local guest user to read host memory by setting the display to a high resolution. (CVE-2014-3615)
- A flaw exists in the set_pixel_format() function within ui/vnc.c in QEMU that allows a remote attacker, using a small bytes_per_pixel value, to cause a denial of service condition. (CVE-2014-7815)
- A heap-based buffer overflow flaw exists in the Cirrus VGA emulator that allows local guest users to execute arbitrary code via vectors related to blit regions.
Note that environments that contain only PV guests are not vulnerable to these issues.
SolutionApply the relevant hotfix referenced in the vendor advisory.