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| For 2023 (and 2024 ...) - we are now fully retired from IT training. We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk. Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active! I am also active in many other area and still look after a lot of web sites - you can find an index ((here)) |
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Are nasty programs looking for security holes on your server?
Looking through my log file reports for the last week, I have found the following in my "failed requests" log. 546: /errors.phpSo what are these requests? Should I be worried? They're attempts to break into my system. But I'm not being particularly targeted - this is an automated attack, attempting to call on a script which I don't have to run code that's held on those remote sites which have previously been compromised. And if they succeed, they they'll set the same hole up on my system and carry on to the next. The particular accesses above actually don't worry me - they were all "404"d - but rather they form a warning of the dangers of allowing external code to be included in PHP. Visiting the URLs given as the "error=" parameter, I find a variety of "not found" pages which means that the hole has not been closed on the remote system, and nasty pieces of PHP which mean that the remote machine is still compromised. (If you, reading this article, visit any of them you should get a 404 as I have distorted the URLs that were live - I don't want to make this into a "how to break in" manual page!). But I do have copies of the scripts that I can show bona fide delegates on our PHP courses, and of the futher log details of the programs (often in Perl) that are injected. If you are worried about being infected, the particular attack file contains the string "Mic22" - so if you search for that ... (written 2008-02-17, updated 2008-02-18) Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles H117 - Security in PHP[345] Spotting a denial of service attack - (2005-06-12) [426] Robust checking of data entered by users - (2005-08-27) [920] A lion in a cage - PHP - (2006-11-10) [947] What is an SQL injection attack? - (2006-11-27) [1052] Learning to write secure, maintainable PHP - (2007-01-25) [1086] Injection attacks - safeguard your PHP scripts - (2007-02-20) [1323] Easy handling of errors in PHP - (2007-08-27) [1387] Error logging to file not browser in PHP - (2007-10-11) [1396] Using PHP to upload images / Store on MySQL database - security questions - (2007-10-19) [1482] A story about benchmarking PHP - (2007-12-23) [1679] PHP - Sanitised application principles for security and useability - (2008-06-16) [1694] Defensive coding techniques in PHP? - (2008-07-02) [1747] Who is watching you? - (2008-08-10) [1779] Injection Attacks - avoiding them in your PHP - (2008-08-31) [2025] Injection Attack if register_globals in on - PHP - (2009-02-04) [2628] An example of an injection attack using Javascript - (2010-02-08) [2688] Security considerations in programming - what do we teach? - (2010-03-22) [2939] Protecting your images from use out of context - (2010-08-29) [3210] Catchable fatal error in PHP ... How to catch, and alternative solutions such as JSON - (2011-03-22) [3698] How to stop forms on other sites submitting to your scripts - (2012-04-15) [3747] An easy way to comply with the new cookie law if your site is well designed - (2012-06-02) [3813] Injection Attacks - PHP, SQL, HTML, Javascript - and how to neutralise them - (2012-07-22) [4642] A small teaching program - demonstration of principles only - (2016-02-08)
Some other Articles
The geometry of East LondonLetting new visitors know we provide training courses FSB, EGM, AGM. Learning Object Oriented Principles (and perhaps Java) Are nasty programs looking for security holes on your server? Colour, Composition or Content Chinese New Year A forum is not always the best vehicle Teaching Object Oriented Java with Students and Ice Cream To Wales - where theres still a toll on the bridge |
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Link to page ... 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96 at 50 posts per pageThis is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.
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