By Marsel Nizamutdinov

An outline and research of the vulnerabilities brought on by programming error in internet functions, this e-book is written from either from the attacker's and safety specialist's point of view. lined is detecting, investigating, exploiting, and doing away with vulnerabilities in internet purposes in addition to blunders comparable to Hypertext Preprocessor resource code injection, SQL injection, and XSS. the most typical vulnerabilities in personal home page and Perl scripts and strategies of exploiting those weaknesses are defined, info on writing intersite scripts and safe platforms for the hosted websites, growing safe authorization structures, and bypassing authorization. exposed is how attackers can enjoy the hosted aim and why an it appears normal-working software should be susceptible.

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Example text

Because the PHP interpreter doesn't restrict the extension of a file with PHP code, it executes code contained in any file, regardless of the extension. So, the attacker can upload a file with PHP code, for example, PHP shell, if he or she specifies a graphic format extension. For example, the file can have the following code: To exploit this vulnerability successfully, the attacker needs the relative path to the file with the malicious code. He or she doesn't need the full path to the file or to a vulnerable script.

Escape character is '^]'. ru FTP server ready. 34 Chapter 2: Vulnerabilities in Scripts Chapter 2: Vulnerabilities in Scripts 35 USER 331 Password required for . PASS test 530 Login incorrect. QUIT 221 Goodbye. As a result, the following data will be logged in /var/log/messages: Sep 1 00:01:40 server ftpd[12345]: user "

1 Accept: */*. Accept-Language: en-us. Accept-Encoding: deflate. 0

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