Vulnerability Name:

CCN-116304

Published:2016-08-17
Updated:2016-08-17
Summary:Microsoft Windows is vulnerable to a denial of service, caused by a divide-by-zero exception in win32k!MAPPER::bFoundExactMatch. By persuading a victim to open content containing specially-crafted FON fonts, a attacker could exploit this vulnerability to cause the system to crash.
CVSS v3 Severity:5.5 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H)
5.0 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:P/RL:U/RC:R)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): Required
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
CVSS v2 Severity:4.6 Medium (CCN CVSS v2 Vector: AV:L/AC:L/Au:S/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
Vulnerability Consequences:Denial of Service
References:Source: CCN
Type: Google Security Research Issue 855
Windows Kernel win32k.sys FON font processing: divide-by-zero exception in win32k!MAPPER::bFoundExactMatch

Source: XF
Type: UNKNOWN
ms-win32k-fon-dos(116304)

Source: CCN
Type: Packet Storm Security [08-17-2016]
Microsoft Windows Kernel win32k.sys FON Divide-By-Zero

Vulnerable Configuration:Configuration CCN 1:
  • cpe:/o:microsoft:windows_7:-:sp1:-:*:-:-:x32:*
  • OR cpe:/o:microsoft:windows_7:*:sp1:*:*:*:*:x64:*
  • OR cpe:/o:microsoft:windows_8.1:-:-:-:*:-:-:x32:*
  • OR cpe:/o:microsoft:windows_8.1:*:*:*:*:*:*:x64:*

  • * Denotes that component is vulnerable
    BACK
    microsoft windows 7 - sp1
    microsoft windows 7 * sp1
    microsoft windows 8.1 - -
    microsoft windows 8.1 *