iDefense Security Advisory 07.17.07 - Remote exploitation of a denial of service vulnerability within version 5.1.0.2 of IBM Corp.'s Tivoli Provisioning Manager for OS Deployment allows attackers to deny service to all product functionality. This vulnerability specifically exists in the TFTP protocol implementation. When processing a read request (RRQ), an integer division by zero error can be triggered by supplying an invalid "blksize" argument. This exception is not handled and will result in the rembo.exe service terminating. iDefense has confirmed the existence of this vulnerability in version 5.1.0.2 of IBM Corp.'s Tivoli Provisioning Manager for OS Deployment. Version 5.1.0.116 was tested and found not to be vulnerable.
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