Tobias Klein has reported a vulnerability in FFmpeg, which potentially can be exploited by malicious people to compromise an application using the library.
The vulnerability is caused due to a signedness error within the "fourxm_read_header()" function in libavformat/4xm.c. This can be exploited to corrupt arbitrary memory via a specially crafted 4xm file.
Successful exploitation may allow execution of arbitrary code.
Solution: Fixed in the SVN repository at revision 16846.
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