protecting data and privacy from abuse by adversaries who have access to the software system as a whole. Its purpose is to make software resilient to attack, especially when network defenses alone are insufficient.
preventable by two-factor authentication • Automated technical exploits, that are aggressively applied over a large number of sites, succeeded because basics are ignored • Poor security, including unencrypted backups, leading to an unauthorized person having access to both the data and the means to read it
9. “Most outsourced software (software developed off-site by contractors) is full of backdoors…. Companies that commission this kind of software have not traditionally paid any attention to security at all” (2004).
Confidential business information 3. Confidential: Information that customers consider confidential 4. Sensitive: Personal and Private Information (PII), information that THE LAW considers confidential 5. Highly Sensitive: Encryption keys, server secrets, staff/admin passwords
security policy is very beneficial and in some cases required by regulation • It should state how the organization deals with sensitive information, such as formally adopting an information classification system • It should include value statements that empower internal stakeholders to demand security be addressed as part of a custom software process
description of the story used for planning and as a reminder 2. conversations about the story that serve to flesh out the details of the story 3. tests that convey and document details and that can be used to determine when a story is complete
new account by filling in my e-mail address and desired password Security Notes: • Can we verify that the user really has the email address on signup? • The password should be at least 12 characters long and should definitely allow for spaces and punctuation
choose the “Assist Customer” button to login as that customer to provide him or her with excellent service. Security Notes: • We need to have a ton of logging around this feature • Staff members should be required to have authenticated with two- factor so that we do not have an unauthorized person accessing this with just a staff credential • Let’s identify certain private fields that customer service does not need access to while helping the customer. Those should be restricted; can we use the database SQL permissions to raise an exception if any of those fields is accessed while using this feature?
subpoena for all material records for a particular account and have exhausted my options to reject it, I work with a system administrator to produce the data while not pulling unnecessary records. Security Notes: • As a matter of policy, we push back on all Law enforcement requests. • Even when the government compels access, we have to protect privacy.
access to this web application’s Cloud Hosting account so that I can lock out the legitimate owners and delete the servers and their backups, to destroy their entire business
want to obtain employee names, addresses, and social security numbers, so that I can steal their identity and finance a Corvette under their name. Source: Fitzer, James R. Agile Information Security, p 37
Top 10, the STRIDE Threat Model • Use Secure HTTP Headers and enable SSL-only with Strict-Transport Security on all production sites • Run automated audit tools, such as Brakeman, Bundler-audit, Code Climate, and Linters • Use GnuPG (or PGP) as part of your workflow • Practice on the OWASP WebGoat, Railsgoat, or Pygoat!
be mitigated by wishful thinking alone 2. Application Security is about preventing abuse by adversaries who have access to the system, focusing on the app itself rather than just its environment 3. Have an Information Classification system 4. Treat security as a requirement by writing Abuser Stories along with your User Stories. 5. Apply practical technical countermeasures, such as including OWASP Top 10 and your abuse stories in your automated test suite
I write on security and other topics • https://rietta.com/blog • On Twitter • https://twitter.com/frankrietta • Learn more about Rietta’s community sponsorship, including the Atlanta Ruby Users’ Group videos • https://rietta.com/community
web APIs. Unlike other contract development shops, application security is actually our primary concern when we write code and build products. A Security-based Development Firm
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