Microsoft Windows 'LoadUvsTable()' Heap-based Buffer Overflow

2017.03.16
Credit: Hossein Lotfi
Risk: High
Local: No
Remote: Yes
CWE: N/A


CVSS Base Score: 9.3/10
Impact Subscore: 10/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

# 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

References:

https://technet.microsoft.com/en-us/library/security/ms17-013.aspx
https://twitter.com/hosselot/status/809059287037251584
http://blogs.flexerasoftware.com/secunia-research/2016/12/microsoft_windows_loaduvstable_heap_based_buffer_overflow_vulnerability.html


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