iDefense Security Advisory 05.07.08 - Remote exploitation of an integer signedness vulnerability in rdesktop, as included in various vendors' operating system distributions, allows attackers to execute arbitrary code with the privileges of the logged-in user. The vulnerability exists within the code responsible for reallocating dynamic buffers. The rdesktop xrealloc() function uses a signed comparison to determine if the requested allocation size is less than 1. When this occurs, the function will incorrectly set the allocation size to be 1. This results in an improperly sized heap buffer being allocated, which can later be overflowed. iDefense confirmed the existence of this vulnerability in rdesktop version 1.5.0. Previous versions may also be affected.
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