[REVS] Smack the Stack - Advanced Buffer Overflow Methods (Virtual Address)

From: SecuriTeam (support_at_securiteam.com)
Date: 10/11/05

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Date: 11 Oct 2005 14:06:14 +0200

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      Smack the Stack - Advanced Buffer Overflow Methods (Virtual Address)
    ------------------------------------------------------------------------

    SUMMARY

    From time to time, a new patch or security feature is integrated to raise
    the bar on buffer overflow exploiting. The paper linked here includes five
    creative methods to overcome various stack protection patches, but in
    practice focus on the VA (Virtual Address) space randomization patch that
    have been integrated to Linux 2.6 kernel. These methods are not limited to
    this patch or another, but rather provide a different approach to the
    buffer overflow exploiting scheme.

    DETAILS

    VA Patch:
    Causes certain parts of a process virtual address space to be different
    for each invocation of the process. The purpose of this is to raise the
    bar on buffer overflow exploits. As full randomization makes it not
    possible to use absolute addresses in the exploit. Randomizing the stack
    pointer and mmap() addresses. Which also effects where shared libraries
    goes, among other things. The stack is randomized within an 8Mb range and
    applies to ELF binaries. The patch intedned to be an addition to the NX
    support that was added to the 2.6 kernel earlier as well. This paper
    however addressed it as solo.

    The full paper can be downloaded from:
    <http://www.tty64.org/doc/smackthestack.txt>
    http://www.tty64.org/doc/smackthestack.txt

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:izik@tty64.org> Izik.
    The original article can be found at:
    <http://www.tty64.org/doc/smackthestack.txt>
    http://www.tty64.org/doc/smackthestack.txt

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