iDefense Security Advisory 10.30.07 - Local exploitation of a file access vulnerability in the swcons command included in multiple versions of IBM Corp.'s AIX could allow for the creation or modification of arbitrary files anywhere on the system. The vulnerability specifically exists due to a lack of sanity checking when using the -p option. If a user specifies a file with the -p option, the contents of that file will be overwritten with 65,535 bytes of uncontrolled data. If the file doesn't exist, it will be created. In both cases, the file will also be converted to mode 222, which allows all users on the system to modify it. By specifying a system file, users can cause a denial of service condition or elevate privileges. iDefense has confirmed the existence of this vulnerability on IBM AIX version 5.2. It is suspected that previous versions are also vulnerable.
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