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47 lines
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1.5 KiB
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OpenType font file format remote (client-side) DoS exploit for Windows
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By Oleksiuk Dmytro (aka Cr4sh)
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http://twitter.com/d_olex
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http://blog.cr4.sh
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mailto:cr4sh0@gmail.com
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************************************************************************
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INFO:
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Zero day vulnerability exists in kernel-mode library ATMFD.DLL, that using by OS for working with PostScript-based OpenType font files (.OTF)
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Vulnerable versions of Windows/ATMFD.DLL: all, x32 and x64.
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Opening malicious .OTF font file, that can be embedded in Microsoft Office document or web-page, causes a BSoD on NT 5.x (Windows XP, Server 2003) and 100% CPU overage on NT 6.x (Vista, 7, Server 2008).
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To trigger vulnerability -- double click on CFF_Type-1_0x0d_expl.otf
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The point of vulnerability -- invalid decoding of 0x0d byte in the Type 2 Charstring Format Glyph, that drops ATMFD.DLL code into the infinite loop.
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"good" glyph representation:
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[68]={
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95 112 99 65 61 vhcurveto
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endchar
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}
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Malicious glyph representation:
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[68]={
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95 112 99 65 reserved13
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vhcurveto
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endchar
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}
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This vulnerability was found with MsFontsFuzz fuzzer, that can be downloaded on https://github.com/Cr4sh/MsFontsFuzz
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More detailed vulnerability analysis can be found at http://blog.cr4.sh/2012/06/0day-windows.html (russian, use Google Translate).
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====
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POC
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====
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https://github.com/offensive-security/exploitdb-bin-sploits/raw/master/bin-sploits/19089.rar |