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930 B
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32 lines
No EOL
930 B
Text
# Date: 15-03-2017
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# Author: Hossein Lotfi (https://twitter.com/hosselot)
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# CVE: CVE-2016-7274
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1. Description
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An integer overflow error within the "LoadUvsTable()" function of usp10.dll
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can be exploited to cause a heap-based buffer overflow. Full analysis is
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available at:
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http://blogs.flexerasoftware.com/secunia-research/2016/12/microsoft_windows_loaduvstable_heap_based_buffer_overflow_vulnerability.html
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2. Proof of Concept
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open “C:\Windows\Fonts\phagspa.ttf” in a hex editor and change the value at
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offset 0x2051 from 0x00000006 to 0x33333334.
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3. Solution:
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Microsoft initially tried to fixed the issue in MS16-147, but the fix was
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incomplete and the issue remained unpatched til Microsoft March 2017 patch
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release:
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https://twitter.com/hosselot/status/809059287037251584
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It appears MS17-013 finally fixed the vulnerability properly:
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https://technet.microsoft.com/en-us/library/security/ms17-013.aspx
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@hosselot |