MsFontsFuzz: OpenType font format fuzzer for Windows
… where and – Text name of the font and path to the .TTF/.OTF font file.
The [options] can be:
–test – Just draw font characters and print file information without fuzzing.
–text – String that will be drawn during fuzzing using the specified font. By default – ASCII ñcharacters string in range 20h – 7Fh.
–noisy – Print detailed information about each fuzzing iteration.
–fix-crcs – Fix invalid checksums in specified font file without fuzzing.
EXAMPLE:
See ReleaseBrushScriptStd_Fuzzing.bat – you can run this scenario to start fuzzing with the Brush Script Std Regular font.
This fuzzer helps to find remote (client-side) DoS 0day vulnerability in Windows kernel, with invalid decoding of 0x0d byte in the Type 2 Charstring Format Glyph, that drops ATMFD.DLL code into the infinite loop.
PoC code: http://dl.dropbox.com/u/22903093/blog/CFF_Type-1_0x0d_expl/CFF_Type-1_0x0d_expl.rar
Detailed analysis (russian): http://blog.cr4.sh/2012/06/0day-windows.html
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About the Project : By Oleksiuk Dmytro (aka Cr4sh)
http://twitter.com/d_olex | http://blog.cr4.sh | mailto:cr4sh0@gmail.com
