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Question 520 - 312-50v12 discussion

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In an intricate web application architecture using an Oracle database, you, as a security analyst, have identified a potential SQL Injection attack surface. The database consists of 'x' tables, each with y columns. Each table contains z1 records. An attacker, well-versed in SQLi techniques, crafts 'u' SQL payloads, each attempting to extract maximum data from the database. The payloads include UNION SELECT' statements and 'DBMS_XSLPPOCESSOR.READ2CLOB' to read sensitive files. The attacker aims to maximize the total data extracted E=xyz'u'. Assuming 'x=4\ y=2\ and varying z' and 'u\ which situation is likely to result in the highest extracted data volume?

A.
z=400. u=4: The attacker constructs A SQLpayloads, each focusing on tables with 400 records, influencing all columns of all tables
Answers
A.
z=400. u=4: The attacker constructs A SQLpayloads, each focusing on tables with 400 records, influencing all columns of all tables
B.
z=550, u=Z Here, the attacker formulates 2 SQL payloads and directs them towards tables containing 550 records, impacting all columns and tables
Answers
B.
z=550, u=Z Here, the attacker formulates 2 SQL payloads and directs them towards tables containing 550 records, impacting all columns and tables
C.
z=600. u=2: The attacker devises 2 SQL payloads. each aimed at tables holding 600 records, affecting all columns across all tables
Answers
C.
z=600. u=2: The attacker devises 2 SQL payloads. each aimed at tables holding 600 records, affecting all columns across all tables
D.
Az=500. u=3: The attacker creates 3 SQL payloads and targets tables with 500 records each, exploiting all columns and tables
Answers
D.
Az=500. u=3: The attacker creates 3 SQL payloads and targets tables with 500 records each, exploiting all columns and tables
Suggested answer: C

Explanation:

The total data extracted by the attacker is E=xyz'u', where x is the number of tables, y is the number of columns, z is the number of records, and u is the number of SQL payloads. To maximize E, the attacker would want to choose the highest values of z and u, while keeping x and y constant. Therefore, the situation where z=600 and u=2 would result in the highest extracted data volume, as E=42600*2=9600. The other situations would result in lower values of E, as shown below:

A: E=42400*4=12800

B: E=42550*2=8800

D: E=42500*3=12000

The attacker uses UNION SELECT statements to combine the results from different tables and columns, and DBMS_XSLPPOCESSOR.READ2CLOB to read sensitive files from the database server12.These techniques can bypass input validation and pattern matching measures that are based on the application's responses3.

1: DBMS_XSLPROCESSOR - Oracle Help Center

2: DBMS_XSLPROCESSOR.READ2CLOB Example Script to Read a file data into ...

3: Attack Surface Analysis - OWASP Cheat Sheet Series

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asked 18/09/2024
Tshimangadzo Mbulawa
35 questions
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