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Home  Ask the Team  Mailing Lists  Advertising Info  Advisories  About SecuriTeam  Blogs Brought to you by: Suppliers of: Website Testing Tools Network Testing Tools Software Testing Tools SecuriTeam in Your Inbox New vulnerability? New tool? Tell us (Our PGP key). 5% Off any SANS course Use Code: SecuriTeam_5 Hack In Paris La Nuit du Hack Cyber Intelligence Europe 2013 Subjects of Interest: Vulnerability Management SQL Injection Buffer Overflows Active Network Scanning Fuzzing Fuzzer Report Network Security Network Scanner Pen Testing Security Scanner	Vulnerability in Server Service Allows Code Execution (MS08-067, PoC) 24 Oct. 2008    Summary The following exploit code will simulate the MS08-067 vulnerability and cause the Server service to fail on vulnerable Windows systems.   Credit: The information has been provided by Alexander Sotirov. The original article can be found at: http://www.phreedom.org/blog/2008/decompiling-ms08-067/ Free Website Security Scan Free Fuzzer Report Vulnerability Assessment Detect web app vulnerabilities University study comparing the top Accurate and automated scanning Get guidance from professionals. 6 commercially availble fuzzers. for networks of any size.    Details Protect your website! Free Trial, Nothing to install. No interruption of visitors. www.beyondsecurity.com/vulnerability-scanner Exploit: #include <wchar.h> // This is the decompiled function sub_5B86A51B in netapi32.dll on XP SP3 int ms08_067(wchar_t* path) {    wchar_t* p;    wchar_t* q;    wchar_t* previous_slash = NULL;    wchar_t* current_slash = NULL;    wchar_t ch;    // If the path starts with a server name, skip it    if ((path[0] == L'\\' || path[0] == L'/') &&        (path[1] == L'\\' || path[1] == L'/'))    {        p = path+2;        while (*p != L'\\' || *p != L'/') {            if (*p == L'\0')                return 0;            p++;        }        p++;        // make path point after the server name        path = p;        // make sure the server name is followed by a single slash        if (path[0] == L'\\' || path[0] == L'/')            return 0;    }    if (path[0] == L'\0') // return if the path is empty        return 1;    // Iterate through the path and canonicalize ..\ and .\    p = path;    while (1) {        if (*p == L'\\') {            // we have a slash            if (current_slash == p-1) // don't allow consequtive slashes                return 0;            // store the locations of the current and previous slashes            previous_slash = current_slash;            current_slash = p;        }        else if (*p == L'.' && (current_slash == p-1 || p == path)) {            // we have \. or ^.            if (p[1] == L'.' && (p[2] == L'\\' || p[2] == L'\0')) {                // we have a \..\, \..$, ^..\ or ^..$ sequence                if (previous_slash == NULL)                    return 0;                // example: aaa\bbb\..\ccc                // ^ ^ ^                // | | &p[2]                // | |                // | current_slash                // |                // previous_slash                ch = p[2];                wcscpy(previous_slash, &p[2]);                if (ch == L'\0')                    return 1;                current_slash = previous_slash;                p = previous_slash;                // find the slash before p                // BUG: if previous_slash points to the beginning of the                // string, we'll go beyond the start of the buffer                //                // example string: \a\..\                q = p-1;                                while (*q != L'\\' && q != path)                    q--;                if (*p == L'\\')                    previous_slash = q;                else                    previous_slash = NULL;            }            else if (p[1] == L'\\') {                // we have \.\ or ^.\                if (current_slash != NULL) {                    wcscpy(current_slash, &p[1]);                    goto end_of_loop;                }                else { // current_slash == NULL                    wcscpy(p, p+2);                    goto end_of_loop;                }            }            else if (p[1] != L'\0') {                // we have \. or ^. followed by some other char                if (current_slash != NULL) {                    p = current_slash;                }                *p = L'\0';                return 1;            }        }        p++; end_of_loop:        if (*p == L'\0')            return 1;    } } // Run this program to simulate the MS08-067 vulnerability int main() {    return ms08_067(L"\\a\\..\\"); 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