iDefense Security Advisory 10.30.07 - Local exploitation of a buffer overflow vulnerability in the crontab program of IBM Corp.'s AIX 5.2 operating system allows attackers to execute arbitrary code with root privileges. The problem specifically exists within the main function. While processing command line arguments, the crontab program will copy a user-supplied argument to a fixed size BSS (data segment) buffer. Since no bounds checking is performed, it's possible to overwrite a large portion of the data stored in the BSS memory area. iDefense has confirmed the existence of this vulnerability within AIX version 5.2. Previous versions are suspected to be vulnerable. AIX 5.3 does not appear to be vulnerable.
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