9.3 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:M/Au:N/C:C/I:C/A:C
8.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.8 High
AI Score
Confidence
High
0.279 Low
EPSS
Percentile
96.9%
# Date: 15-03-2017
# Author: Hossein Lotfi (https://twitter.com/hosselot)
# CVE: CVE-2016-7274
1. Description
An integer overflow error within the "LoadUvsTable()" function of usp10.dll
can be exploited to cause a heap-based buffer overflow. Full analysis is
available at:
http://blogs.flexerasoftware.com/secunia-research/2016/12/microsoft_windows_loaduvstable_heap_based_buffer_overflow_vulnerability.html
2. Proof of Concept
open “C:\Windows\Fonts\phagspa.ttf” in a hex editor and change the value at
offset 0x2051 from 0x00000006 to 0x33333334.
3. Solution:
Microsoft initially tried to fixed the issue in MS16-147, but the fix was
incomplete and the issue remained unpatched til Microsoft March 2017 patch
release:
https://twitter.com/hosselot/status/809059287037251584
It appears MS17-013 finally fixed the vulnerability properly:
https://technet.microsoft.com/en-us/library/security/ms17-013.aspx
@hosselot
9.3 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:M/Au:N/C:C/I:C/A:C
8.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.8 High
AI Score
Confidence
High
0.279 Low
EPSS
Percentile
96.9%