Arbitrary file reading vulnerability exploitation Guide

original text https://woj.app/6663.html

The basic idea is to try to read sensitive files to get as much information as possible .
such as , /etc/issue Can confirm Linux The distribution of the host ,
among .bash_history, ssh Related path It may contain a lot of sensitive information ,
Get /etc/shadow Can be used directly John The Ripper Try enumerating root password .
Tomcat The console can read the user password /usr/local/tomcat/conf/tomcat-users.xml.

Incidentally, it provides some ideas for mining such vulnerabilities in the state of black box and white box , Mainly with PHP For example .

Make efficient use of dictionaries ： https://github.com/ev0A/ArbitraryFileReadList

Determine the system type (Linux Specific release of )

uname -a
lsb_release -d
cat /etc/issue
cat /etc/os-release
cat /etc/redhat-release
cat /etc/debian_version
cat /etc/slackware_version
ls /etc/*version
cat /proc/version
cat /proc/cpuinfo

Other instructions ( Server process permission judgment )

Virtual machines can be constructed locally , Build a similar environment , Check the default path .

Server process permission judgment ： adopt /etc/shadow, /proc/self/cwd Can you read it , You can judge the permissions of the process , Can be read (root), Do not read ( Not root)

Some files require high permissions to read

`.bash_history` #  The history may carry the user's password  ( Encountered real cases , It is the parameter in case of wrong input , For example, no input  su  But I thought I lost  su)

/etc/passwd #  User information 
/etc/shadow #  Read user password 
/usr/local/tomcat/conf/tomcat-users.xml # tomcat  User profile 
/etc/hosts #  Host information , Some Intranet domain names are usually configured 
/root/.bashrc #  environment variable 
/root/.bash_history #  Historical operation record 
/home/username/.bash_history  #  Read the operation history of a specific user 
/var/lib/mlocate/mlocate.db #  The configuration information based on the information of all local files is known . High authority users are required to 
/root/.viminfo # vim  Information 
/root/.ssh/id_rsa  #  Take the private key directly ssh
/proc/xxxx/cmdline #  Process status enumeration  xxxx  It can be for 0000-9999  Use burpsuite
 database  config  file 
/etc/redis.conf   # redis The configuration file 
web  journal  access.log, error.log
ssh  journal 
/var/lib/php/sess_PHPSESSID #  Unconventional questions  session  file (  Reference resources   Together with Ping An Technology session contain  http://www.jianshu.com/p/2c24ea34566b)

/proc/sched_debug #  The configuration file can see the current running process and get the corresponding process information pid
/proc/pid/cmdline   #  You can see the corresponding pid The complete command line for the process .
/proc/net/fib_trie   #  Intranet IP
/proc/self/environ   #  environment variable 
/proc/self/loginuid   #  The current user 

#  Internet Information 
/proc/net/arp
/proc/net/tcp
/proc/net/udp
/proc/net/dev

A brief description of the fields in the dictionary

/proc/sched_debug #  Provide cpu On the running process information , You can get the process pid Number , It can meet the needs of the later pid The use of 
/proc/mounts #  List of mounted file systems 
/proc/net/arp # arp surface , You can get the addresses of other machines in the Intranet 
/proc/net/route #  Routing table information 
/proc/net/tcp and /proc/net/udp #  Active connection information 
/proc/net/fib_trie #  The routing cache 
/proc/version  #  Kernel version 

/proc/[PID]/cmdline #  May contain useful path information 
/proc/[PID]/environ #  Information about the environment variables in which the program is running , Can be used to include getshell
/proc/[PID]/cwd     #  The working directory of the current process 
/proc/[PID]/fd/[#] #  visit file descriptors, A write condition can read to the file that the process is using , such as access.log

Apache

/home/httpd/
/home/httpd/www/

tomcat

/usr/local/services/apache-tomcat-8.0.23/logs
/usr/local/services/apache-tomcat-8.0.23/logs/catalina.out

Nginx

/etc/nginx/nginx.conf
/var/www/html
/usr/local/services/nginx-1.6.2/logs/access.log
/usr/local/services/nginx-1.6.2/logs/error.log 
/usr/local/services/nginx-1.6.2/nginx.conf
/usr/local/services/nginx-1.6.2/conf/nginx.conf
/usr/local/services/nginx-1.6.2/conf/proxy.conf 
/usr/local/services/nginx-1.6.2/conf/extra/haolaiyao.conf

jetty

/usr/local/services/jetty-8.1.16/
/usr/local/services/jetty-8.1.16/logs/stderrout.log
/usr/local/services/jetty-8.1.16/etc/jetty.xml

system proc

/proc/self/cmdline
/proc/self/stat
/proc/self/status
/proc/self/environ
/proc/verison
/proc/cmdline
/proc/self/cwd
/proc/self/fd/0
/proc/self/fd/1
/proc/self/fd/2
/proc/self/fd/3
/proc/self/fd/4
/proc/self/fd/5
/proc/self/fd/6
/proc/self/fd/7
/proc/self/fd/8
/proc/self/fd/9
/proc/self/fd/10
/proc/self/fd/11
/proc/self/fd/12
/proc/self/fd/13
/proc/self/fd/14
/proc/self/fd/15
/proc/self/fd/16
/proc/self/fd/17
/proc/self/fd/18
/proc/self/fd/19
/proc/self/fd/20
/proc/self/fd/21
/proc/self/fd/22
/proc/self/fd/23
/proc/self/fd/24
/proc/self/fd/25
/proc/self/fd/26
/proc/self/fd/27
/proc/self/fd/28
/proc/self/fd/29
/proc/self/fd/30
/proc/self/fd/31
/proc/self/fd/32
/proc/self/fd/33
/proc/self/fd/34
/proc/self/fd/35
/proc/sched_debug
/proc/mounts
/proc/net/arp
/proc/net/route
/proc/net/tcp
/proc/net/udp
/proc/net/fib_trie
/proc/version

ssh

/root/.ssh/id_rsa
/root/.ssh/id_rsa.pub
/root/.ssh/authorized_keys
/etc/ssh/sshd_config
/var/log/secure

network

/etc/sysconfig/network-scripts/ifcfg-eth0
/etc/syscomfig/network-scripts/ifcfg-eth1

application

/opt/nginx/conf/nginx.conf
/var/www/html/index.html
/root/.mysql_history
/root/.wget-hsts
/etc/my.cnf

common

/etc/passwd
/etc/shadow
/etc/hosts
/root/.bash_history
/root/.ssh/authorized_keys
/root/.mysql_history
/root/.wget-hsts
/var/www/html/index.html

protocol

file:///etc/passwd
gopher:///etc/passwd
ftp://

SSRF Intranet detection

url=http://10.29.5.24

Windows

C:\boot.ini  // Check the system version 
C:\Windows\System32\inetsrv\MetaBase.xml  //IIS The configuration file 
C:\Windows\repair\sam  // Password for the initial installation of the storage system 
C:\Program Files\mysql\my.ini  //Mysql To configure 
C:\Program Files\mysql\data\mysql\user.MYD  //Mysql root
C:\Windows\php.ini  //php Configuration information 
C:\Windows\my.ini  //Mysql Configuration information