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TortoiseSVN 1.12.1 Remote Code Execution

  1. last year


    TortoiseSVN version 1.12.1 suffers from a remote code execution vulnerability.
    MD5 | c2b2ef9f102ec3dce79dfa3d1c853566

    Document Title:
    TortoiseSVN v1.12.1 - Remote Code Execution Vulnerability
    References (Source):
    Release Date:
    Vulnerability Laboratory ID (VL-ID):
    Common Vulnerability Scoring System:
    Vulnerability Class:
    Code Execution
    Current Estimated Price:
    4.000€ - 5.000€
    Product & Service Introduction:
    TortoiseSVN is a really easy to use Revision control / version control /
    source control software for Windows.
    It is based on Apache Subversion (SVN); TortoiseSVN provides a nice and
    easy user interface for Subversion.
    It is developed under the GPL. Which means it is completely free for
    anyone to use, including in a commercial
    environment, without any restriction. The source code is also freely
    available, so you can even develop your
    own version if you wish to. Since it's not an integration for a specific
    IDE like Visual Studio, Eclipse or
    others, you can use it with whatever development tools you like, and
    with any type of file.
    (Copy of the about page: )
    Abstract Advisory Information:
    A vulnerability laboratory researcher (vxrl team) discovered a remote
    code execution vulnerability in the TortoiseSVN v1.12.1 software.
    Vulnerability Disclosure Timeline:
    2019-08-13: Public Disclosure (Vulnerability Laboratory)
    Affected Product(s):
    Product: TortoiseSVN - Software 1.12.1
    Discovery Status:
    Exploitation Technique:
    Severity Level:
    Authentication Type:
    Pre auth - no privileges
    User Interaction:
    Low User Interaction
    Disclosure Type:
    Independent Security Research
    Technical Details & Description:
    A remote code execution vulnerability has been uncovered in the official
    TortoiseSVN v1.12.1 software.
    The vulnerability typ allows remote attackers to execute arbitrary codes
    to compromise a target computer system.
    The URI handler of TortoiseSVN (Tsvncmd:) allows a customised diff
    operation on Excel workbooks, which could be used to open remote
    workbooks without protection from macro security settings to execute
    arbitrary code.
    The `tsvncmd:command:diff?path:[file1]?path2:[file2]` will execute a
    customised diff on [file1] and [file2] based on the file extension.
    For xls files, it will execute the script `diff-xls.js` using wscript,
    which will open the two files for analysis without any macro
    security warning. An attacker can exploit this by putting a macro virus
    in a network drive, and force the victim to open the workbooks
    and execute the macro inside. Since the macro is triggered through
    wscript, to make the attack less visible, one could kill the wscript
    process and quit the excel program after the code was executed.
    Proof of Concept (PoC):
    The vulnerability could be triggered by visiting a specially crafted URL
    via web browser.
    To reproduce the vulnerability, one could simply create a .url file or
    open the URL with a browsers,
    but a notification prompt may be shown for the latter case.
    the Repo with TortoiseSVN</a>
    where VBoxSvrv is the remote network drive controlled by the attacker,
    v.xlsm is the macro virus and w.xlsx is just an empty excel workbook.
    Password: 23vxrl23
    PoC: Video
    Security Risk:
    The security risk of the remote code execution vulnerability in the
    software component is estimated as high.
    Credits & Authors:
    PingFanZettaKe [VXRL Team] -
    Disclaimer & Information:
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