CVE-2019-11043

1.漏洞描述 Nginx上fastcgi split path info 在处理带有%0a的请求时,会因为遇到换行符\n导致PATH INFO为空。而php-fpm在处理PATH INFO为空的情况下，存在逻辑缺陷。攻击者通过精心的构造和利用，可以导致远程代码执行。

影响范围 Nginx + php-fpm 的服务器,在使用如下配置的情况下，都可能存在远程代码执行漏洞。 location ~ [^ /小.php(/|$) { fastcgi split path info ^(.+ ?.php)(.*)$; fastcgi param PATH INFO $fastcgi path info;fastcgi pass php:9000; }

2.漏洞检测方案一：利用 phuip-fpizdam脚本检测

0x01 安装 phuip-fpizdam-Mac go get github.com/neex/phuip-fpizdam go install github.com/neex/phuip-fpizdam ➜ ~ cd ./go ➜ go go get github.com/neex/phuip-fpizdam ➜ go go install github.com/neex/phuip-fpizdam ➜ go ls bin src ➜ go cd bin ➜ bin ls phuip-fpizdam ➜ bin file phuip-fpizdam phuip-fpizdam: Mach-O 64-bit executable x86_64

➜ bin ls -lah phuip-fpizdam -rwxr-xr-x 1 alewong staff 9.3M 10 24 10:54 phuip-fpizdam

step 2 bin ./phuip-fpizdam

Error: accepts 1 arg(s), received 0 Usage: phuip-fpizdam [url] [flags]

Flags:

  --cookie string       send this cookie

-h, --help help for phuip-fpizdam --kill-count int how many times to send the worker killing payload (default 50) --kill-workers just kill php-fpm workers (requires only QSL) --method string detect method (see detect_methods.go) (default "session.auto_start") --only-qsl stop after QSL detection, use this if you just want to check if the server is vulnerable --pisos int pisos hint --qsl int qsl hint --reset-retries int how many retries to do for --reset-setting, -1 means a lot (default 50) --reset-setting try to reset setting (requires attack params) --setting string specify custom php.ini setting for --reset-setting --skip-attack skip attack phase --skip-detect skip detection phase 2019/10/24 10:56:18 accepts 1 arg(s), received 0

0x03 检验目标网址

step 3 可以看见返回结果为202，成功