CHM files contain various tables and objects stored in "pages." When parsing a page of objects, CHMlib passes an unsanitized value from the file to the alloca() function. This allows an attacker to shift the stack pointer to point to arbitrary locations in memory. Consequently it is possible to write arbitrary data from the file to arbitrary memory locations. Successful exploitation of this vulnerability allows an attacker to execute arbitrary code with the permissions of the user viewing the file. An attacker would have to first convince the user to view the CHM file through some type of social engineering. iDefense has confirmed the existence of this vulnerability in CHMlib version 0.38.
74680a0ac82f6ab9112f2baf2c1524efe089c3ad40b596afccd34cfe22c19e28
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