QEMU and KVM Cirrus VGA buffer overflow

qemu-kvm-cirrusvga-bo (47736) The risk level is classified as HighHigh Risk

Description:

QEMU and KVM (Kernel-based Virtual Machine) are vulnerable to a heap-based buffer overflow, caused by improper bounds checking by the cirrus_invalidate_region() function of the Cirrus VGA driver. By connecting using the VNC console, a local attacker could overflow a buffer and execute arbitrary code on the system with elevated privileges or cause the application to crash.

*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 Access

Remedy:

For QEMU:
Apply the patch available from the QEMU SVN Repository. See References.

For other distributions:
Apply the appropriate update for your system. See References.

References:

Platforms Affected:

  • Canonical Ubuntu 8.04 LTS
  • Canonical Ubuntu 8.10
  • Debian Debian Linux 4.0
  • Debian Debian Linux 5.0
  • Fabrice Bellard QEMU
  • FedoraProject Fedora Core 9
  • KVM Qumranet KVM 1
  • KVM Qumranet KVM 10
  • KVM Qumranet KVM 11
  • KVM Qumranet KVM 12
  • KVM Qumranet KVM 13
  • KVM Qumranet KVM 14
  • KVM Qumranet KVM 15
  • KVM Qumranet KVM 16
  • KVM Qumranet KVM 17
  • KVM Qumranet KVM 18
  • KVM Qumranet KVM 19
  • KVM Qumranet KVM 2
  • KVM Qumranet KVM 20
  • KVM Qumranet KVM 21
  • KVM Qumranet KVM 22
  • KVM Qumranet KVM 23
  • KVM Qumranet KVM 24
  • KVM Qumranet KVM 25
  • KVM Qumranet KVM 26
  • KVM Qumranet KVM 27
  • KVM Qumranet KVM 28
  • KVM Qumranet KVM 29
  • KVM Qumranet KVM 3
  • KVM Qumranet KVM 30
  • KVM Qumranet KVM 31
  • KVM Qumranet KVM 32
  • KVM Qumranet KVM 33
  • KVM Qumranet KVM 34
  • KVM Qumranet KVM 35
  • KVM Qumranet KVM 36
  • KVM Qumranet KVM 37
  • KVM Qumranet KVM 38
  • KVM Qumranet KVM 39
  • KVM Qumranet KVM 4
  • KVM Qumranet KVM 40
  • KVM Qumranet KVM 41
  • KVM Qumranet KVM 42
  • KVM Qumranet KVM 43
  • KVM Qumranet KVM 44
  • KVM Qumranet KVM 45
  • KVM Qumranet KVM 46
  • KVM Qumranet KVM 47
  • KVM Qumranet KVM 48
  • KVM Qumranet KVM 49
  • KVM Qumranet KVM 5
  • KVM Qumranet KVM 50
  • KVM Qumranet KVM 51
  • KVM Qumranet KVM 52
  • KVM Qumranet KVM 53
  • KVM Qumranet KVM 54
  • KVM Qumranet KVM 55
  • KVM Qumranet KVM 56
  • KVM Qumranet KVM 57
  • KVM Qumranet KVM 58
  • KVM Qumranet KVM 59
  • KVM Qumranet KVM 6
  • KVM Qumranet KVM 60
  • KVM Qumranet KVM 61
  • KVM Qumranet KVM 62
  • KVM Qumranet KVM 63
  • KVM Qumranet KVM 64
  • KVM Qumranet KVM 65
  • KVM Qumranet KVM 66
  • KVM Qumranet KVM 67
  • KVM Qumranet KVM 68
  • KVM Qumranet KVM 69
  • KVM Qumranet KVM 7
  • KVM Qumranet KVM 70
  • KVM Qumranet KVM 71
  • KVM Qumranet KVM 72
  • KVM Qumranet KVM 73
  • KVM Qumranet KVM 74
  • KVM Qumranet KVM 75
  • KVM Qumranet KVM 76
  • KVM Qumranet KVM 77
  • KVM Qumranet KVM 78
  • KVM Qumranet KVM 79
  • KVM Qumranet KVM 80
  • KVM Qumranet KVM 81

Reported:

Sep 11, 2008

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