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Log Forging For the same reason that they are a valuable resource for system administrators and developers, logs are a target for attackers If attackers can control a value that is written to the log, they might be able to fabricate events on the system by including entire falsi ed log entries in the input they provide If an attacker is allowed to inject entries into the logs due to a lack of proper input validation, interpretation of the log les might be hindered or misdirected, diminishing their value

link_to "Auction of #{itemname}", item_path(item)

This principle extends to other segment keys in the pattern string of the named route For example, if you ve got a route like

match "auction/:auction_id/item/:id" => "items#show", :as => "item"

Writing mock objects by hand can be tedious, particularly if only one method is required for a particular test case Several mock object generation frameworks have emerged that automate much of this process We recommend EasyMock (http://wwweasymockorg) for testing SCA components The following example demonstrates testing the LoanComponent using a mock CreditService:

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In the most benign case, an attacker might be able to insert false entries into the log le by providing the application with input that includes special characters If the log le is processed automatically, the attacker can render the le unusable by corrupting its format A more subtle attack might involve skewing the log le statistics Forged or otherwise, corrupted log les can be used to cover an attacker s tracks or even to implicate another party in the commission of a malicious act If your log contains security-relevant information, attackers might turn the log into the boy who cried wolf: If they can ll the log so full of false alarms that no one pays attention anymore, no one will be paying attention when the real attack comes Hoglund and McGraw describe a signi cantly nastier outcome, whereby a maliciously crafted piece of input triggers a vulnerability in the program responsible for processing the log les and leads to a further exploit [Hoglund and McGraw, 2004] The web application code in Example 535 attempts to read an integer value from a request object If the value fails to parse as an integer, the input is logged with an error message indicating what happened

link_to "Auction of #{itemname}", item_path(auction, item)

and you d get something like this as your path (depending on the exact id numbers):

String val = requestgetParameter("val"); try { int value = IntegerparseInt(val); } catch (NumberFormatException) { loginfo("Failed to parse val = " + val); }

/auction/5/item/11

Here, we re letting Rails infer the ids of both an auction object and an item object, which it does by calling to_param on whatever non-hash arguments you pass into named route helpers As long as you provide the arguments in the order in which their ids occur in the route s pattern string, the correct values will be dropped into place in the generated path

1 2 3 4 5 CreditScoreService creditService = EasyMockcreateMock(CreditServiceclass); EasyMockexpect(creditServicescoreApplicant (EasyMockisA(Stringclass)))andReturn(700); EasyMockreplay(creditService); LoanService loanService = new LoanComponent(creditService); // test the loanService

If a user submits the string "twenty-one" for val, the following entry is logged:

Furthermore, it doesn t have to be the id value that the route generator inserts into the URL As alluded to a moment ago, you can override that value by defining a to_param method in your model Let s say you want the description of an item to appear in the URL for the auction on that item In the itemrb model file, you would override to_params; here, we ll override it so that it provides a munged (stripped of punctuation and joined with hyphens) version of the description, courtesy of the parameterize method added to strings in Active Support

Of course, if you re putting things like "cello-bow" in a path field called :id, you will need to make provisions to dig the object out again Blog applications that use this technique to create slugs for use in permanent links often have a separate database column to store the munged version of the title that serves as part of the path That way, it s possible to do something like

Itemfind_by_munged_description(params[:id])

However, if an attacker submits the string "twenty-one%0a%0aINFO:

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