Validating the destination file paths

Validating the destination file paths

(Do not use the MD5 algorithm if it can be avoided) Authentication failure responses should not indicate which part of the authentication data was incorrect.For example, instead of "Invalid username" or "Invalid password", just use "Invalid username and/or password" for both.Do not allow the application to issue commands directly to the Operating System, especially through the use of application initiated command shells Avoid calculation errors by understanding your programming language's underlying representation and how it interacts with numeric calculation.Pay close attention to byte size discrepancies, precision, signed/unsigned distinctions, truncation, conversion and casting between types, "not-a-number" calculations, and how your language handles numbers that are too large or too small for its underlying representation Implement safe updating.Authentication credentials should be sufficient to withstand attacks that are typical of the threats in the deployed environment.

For example, do not pass session identifiers as GET parameters Generate a new session identifier if the connection security changes from HTTP to HTTPS, as can occur during authentication.The account must be disabled for a period of time sufficient to discourage brute force guessing of credentials, but not so long as to allow for a denial-of-service attack to be performed Implement monitoring to identify attacks against multiple user accounts, utilizing the same password.This attack pattern is used to bypass standard lockouts, when user IDs can be harvested or guessed Disallow persistent logins and enforce periodic session terminations, even when the session is active.Validate all client provided data before processing, including all parameters, URLs and HTTP header content (e.g. Be sure to include automated post backs from Java Script, Flash or other embedded code If any potentially hazardous characters must be allowed as input, be sure that you implement additional controls like output encoding, secure task specific APIs and accounting for the utilization of that data throughout the application.Examples of common hazardous characters include: If your application manages a credential store, it should ensure that only cryptographically strong one-way salted hashes of passwords are stored and that the table/file that stores the passwords and keys is write-able only by the application.

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Development environments are often configured less securely than production environments and attackers may use this difference to discover shared weaknesses or as an avenue for exploitation Turn off all unnecessary database functionality (e.g., unnecessary stored procedures or services, utility packages, install only the minimum set of features and options required (surface area reduction)) When referencing existing files, use a white list of allowed file names and types.

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