Kees Cook has reported a vulnerability in GD Graphics Library, which can be exploited by malicious people to cause a DoS (Denial of Service).
The vulnerability is caused due to an error within the "gdImageStringFTEx()" function in gdft.c, which can be exploited to increment the terminating NULL of a string, potentially resulting in a buffer overflow.
Successful exploitation requires that a JIS-encoded font is used.
Solution: Do not use JIS-encoded fonts with an application using GD Graphics Library.
Provided and/or discovered by: Kees Cook
Original Advisory: http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=224607
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Subject: GD Graphics Library "gdImageStringFTEx()" Denial of Service
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