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NEW QUESTION: 1
The security administrator finds unauthorized tables and records, which were not present before, on a Linux database server. The database server communicates only with one web server, which connects to the database server via an account with SELECT only privileges.
Web server logs show the following:
90.76.165.40 - - [08/Mar/2014:10:54:04] "GET
calendar.php?create%20table%20hiddenHTTP/1.1" 200 5724
90.76.165.40 - - [08/Mar/2014:10:54:05]
"GET ../../../root/.bash_history HTTP/1.1" 2005724
90.76.165.40 - - [08/Mar/2014:10:54:04] "GET
index.php?user=<script>Create</script>HTTP/1.1" 200 5724
The security administrator also inspects the following file system locations on the database server using the command 'ls -al /root' drwxrwxrwx 11 root root 4096 Sep 28 22:45 .
drwxr-xr-x 25 root root 4096 Mar 8 09:30 ..
-rws------ 25 root root 4096 Mar 8 09:30 .bash_history
-rw------- 25 root root 4096 Mar 8 09:30 .bash_history
-rw------- 25 root root 4096 Mar 8 09:30 .profile
-rw------- 25 root root 4096 Mar 8 09:30 .ssh
Which of the following attacks was used to compromise the database server and what can the security administrator implement to detect such attacks in the future? (Select TWO).
A. Cross-site scripting
B. Implement the following PHP directive: $clean_user_input = addslashes($user_input)
C. Set an account lockout policy
D. Brute force attack
E. Using input validation, ensure the following characters are sanitized: <>
F. SQL injection
G. Update crontab with: find / \( -perm -4000 \) -type f -print0 | xargs -0 ls -l | email.sh
H. Privilege escalation
Answer: G,H
Explanation:
This is an example of privilege escalation.
Privilege escalation is the act of exploiting a bug, design flaw or configuration oversight in an operating system or software application to gain elevated access to resources that are normally protected from an application or user.
The question states that the web server communicates with the database server via an account with SELECT only privileges. However, the privileges listed include read, write and execute (rwx).
This suggests the privileges have been `escalated'.
Now that we know the system has been attacked, we should investigate what was done to the system.
The command "Update crontab with: find / \( -perm -4000 \) type f print0 | xargs -0 ls l | email.sh" is used to find all the files that are setuid enabled. Setuid means set user ID upon execution. If the setuid bit is turned on for a file, the user executing that executable file gets the permissions of the individual or group that owns the file.