Key Moments
What Every Engineer Needs to Know About Security and Where to Learn It
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Key Moments
Security vulnerabilities are rising, with major breaches costing millions and bankrupting companies, yet most university CS programs don't require security coursework, leaving engineers unprepared.
Key Insights
In 2006 alone, over 300 data theft incidents occurred, compromising more than 153 million customer records.
SQL injection attacks, while showing a slight decrease in reported vulnerabilities in early 2007 compared to 2006, remain a significant threat, with pages of related news appearing from simple searches.
Design errors, buffer overflows, and bad exception handling vulnerabilities are on the rise, indicating a shift from input validation issues.
Top vulnerability categories across various databases consistently include cross-site scripting, injection, memory corruption, and denial-of-service, even when sub-attacks are grouped.
Few top university computer science undergraduate programs, including CMU and MIT, have mandatory security coursework, with security often only appearing as an elective or in a few specialized lectures.
Resources for learning security range from university courses and certifications (Stanford, CISSP, GSSP) to books (e.g., 'Security Engineering' by Ross Anderson) and organizations like OWASP and SecurityFocus.
The escalating threat of data breaches and vulnerabilities
The talk opens by highlighting the alarming rise in security threats, citing major incidents like the TJX hack where cybercriminals exploited weak WEP encryption on store Wi-Fi to capture 47 million credit card numbers. Another significant breach involved CardSystems, a payment processor, which lost 263,000 credit card numbers due to an SQL injection vulnerability in its web forms, ultimately leading to the company's demise. The scale of the problem is underscored by the Privacy Rights Clearinghouse, which documented over 300 data theft incidents in 2006 alone, affecting more than 153 million customer records. This pervasive issue suggests that ignoring security is no longer an option for software engineers.
Demystifying common injection attacks
SQL injection is explained as a class of command injection attacks where attackers manipulate input data to be interpreted as control commands for the database. An example is provided where an attacker can input a specially crafted string into a username field, causing the database to drop the entire 'users' table, leading to a denial-of-service. The speaker notes that while data from SecurityFocus showed a potential slight decrease in SQL injection vulnerabilities in early 2007, the attack vector remains prevalent. Other command injection attacks include cross-site scripting (XSS), where injected HTML or JavaScript can steal user cookies or impersonate users, and buffer overflows, which can allow attackers to execute arbitrary code on a server by overwriting memory buffers.
Trends in vulnerability types and their implications
Analyzing vulnerability data from SecurityFocus reveals shifts in attack vectors. While input validation bugs remained relatively stable, vulnerabilities arising from design errors, boundary conditions (like buffer overflows), and poor exception handling were increasing in the first half of 2007. For instance, a bad exception handling scenario could involve an application that, upon not receiving a session ID, defaults to using the session ID of the last logged-in user, granting unauthorized administrative privileges. This trend suggests that simply validating input is insufficient; robust design and careful error handling are critical.
The broad categories of prevalent software vulnerabilities
Regardless of the specific vulnerability database used, four major categories of threats consistently appear at the top: cross-site scripting (encompassing XSS, cross-site request forgery, etc.), injection flaws (including SQL injection and PHP include attacks), memory corruption (like buffer overflows and integer overflows), and denial-of-service. The speaker notes that while the exact prevalence might shift between databases, these remain the core areas of concern for software engineers. Understanding these broad categories is essential for proactive defense, even as specific attack methods evolve.
The critical need for secure design principles
The talk emphasizes that every software engineer must internalize secure design principles, analogous to how object-oriented principles enable extensibility and reusability. Key principles include the 'principle of least privilege,' ensuring users and processes only have the minimum necessary permissions, and a 'fail-safe stance,' where systems default to a secure state if an error occurs. Securing against the 'weakest link' is also paramount, as a single vulnerability can compromise the entire system. Adopting these fundamental design philosophies helps build resilience against emerging threats, irrespective of current trends.
Deficiencies in university security education
A significant concern raised is the lack of mandatory security education in top computer science programs. An examination of curricula at institutions like Carnegie Mellon University (CMU) and MIT revealed that security is often not a required course, and in some cases, not even listed as an elective. While some introductory security topics may be covered as part of broader systems or architecture courses (e.g., a few papers at MIT), this is deemed insufficient to prepare graduates for the reality of writing production code that is inherently exposed to security risks. This gap leaves many engineers entering the workforce without foundational security knowledge.
Resources for continuous learning and skill development
To bridge the education gap, various resources are recommended. These include university courses focusing on cryptography and system security (e.g., Stanford, UC Berkeley), professional certification programs like CISSP (Certified Information Systems Security Professional) and the new GSSP (GIAC Secure Software Programmer), and a wealth of books. Highly recommended books include Ross Anderson's 'Security Engineering' for a broad engineering perspective, Gary McGraw and John Viega's 'Building Secure Software' for software-specific issues, and 'Foundations of Security: What Every Programmer Needs to Know.' Websites like OWASP (Open Web Application Security Project), SecurityFocus, and code.google.com/edu offer valuable information, vulnerability lists, articles, and educational materials, some of which are available for free.
Moving towards making security everyone's responsibility
The ultimate goal, as articulated by the speaker, is for every engineer to become a software security practitioner. While specialized security engineers will likely always be needed, the aspiration is to reduce the reliance on them by embedding security awareness and skills across the entire engineering workforce. This collective effort aims to make many security functions obsolete by proactively building secure systems from the ground up. Resources like learnsecurity.com aggregate all mentioned URLs, encouraging engagement and further learning in security education.
Mentioned in This Episode
●Software & Apps
●Companies
●Organizations
●People Referenced
Engineer's Security Quick Reference
Practical takeaways from this episode
Do This
Avoid This
Vulnerability Trend Comparison (Security Focus DB)
Data extracted from this episode
| Vulnerability Type | First Half 2006 | First Half 2007 |
|---|---|---|
| Input Validation Bugs | Similar | Similar |
| Design Errors | Increasing | Increasing |
| Boundary Condition Problems (incl. Buffer Overflows) | Increasing | Increasing |
| Bad Exception Handling | Not Specified | Increasing |
Top Specific Vulnerabilities Comparison (Security Focus DB)
Data extracted from this episode
| Vulnerability | First Half 2006 | First Half 2007 |
|---|---|---|
| SQL Injection | High | Slight Decrease (significance unclear) |
| Cross-Site Scripting | High | Down |
| Denial of Service | Up | Up |
| Buffer Overflows | Up | Up |
OWASP Top 10 Vulnerabilities: 2004 vs. 2007
Data extracted from this episode
| 2004 Ranking | 2004 Vulnerability | 2007 Status/New Entry |
|---|---|---|
| 1 | Unvalidated Input | Dropped (too broad); specific types now listed |
| 2 | Broken Access Control | Dropped; potentially replaced by more specific categories like failure to restrict URL access |
| N/A | N/A | Cross-Site Request Forgery (New significant entry) |
| N/A | N/A | Malicious File Execution (New entry) |
| N/A | N/A | Application Denial of Service (Replaced by more specific categories) |
| N/A | N/A | Insecure Configuration Management (Dropped, likely focus shift to code) |
| Buffer Overflow | N/A | Surprisingly gone from list; still rising in Miter data for OS/system software |
| Cross-Site Scripting | High | Still present, but specific categorization evolved |
| Injection Flaws (incl. SQL Injection, PHP include) | High | Increasing (Miter data) |
| Memory Corruption | N/A | Present in 'Big Four' breakdown |
| Denial of Service | N/A | Present in 'Big Four' breakdown; Miter data shows increase |
Common Questions
The most prevalent vulnerabilities often include cross-site scripting, SQL injection, command injection, memory corruption, and denial of service attacks. These 'big four' consistently appear across various vulnerability databases.
Mentioned in this video
A retail department store owned by TJX, which was affected by a significant data breach.
A retail department store owned by TJX, which was affected by a significant data breach.
Retail company that owns TJ Maxx and Marshalls, experienced a major data breach where over 47 million credit card numbers were compromised.
A company that acquired the assets of Card Systems after its data breach and subsequent business failure.
An online retailer where the book 'Hacking Exposed Web 2.0' is available for pre-order.
An organization that offers the CISSP certification, focusing on creating an ecosystem around the certification.
The Federal Trade Commission, which is conducting an investigation into the TJX data breach.
Massachusetts Institute of Technology, a prominent university whose computer science program was reviewed for security education.
A publication that ranks university programs, whose list of top CS programs was consulted to review university curricula.
A well-known security training institute that offers the GSSP certification.
The Open Web Application Security Project, a global organization that publishes top 10 vulnerability lists and has local chapters.
A major tech website that dedicates a section to threats and vulnerabilities.
Carnegie Mellon University, whose computer science curriculum was examined for security course requirements.
A university that makes its CS 161 course available, an example of system security education.
A Google platform that provides educational resources, including materials for educators on web security.
A website that maintains a chronology of data theft incidents, used to illustrate the widespread nature of data breaches.
A website that offers free slides corresponding to book chapters for security course development and provides a list of all mentioned resources.
Refers to malicious code or shell code used in attacks like buffer overflows.
The RSA encryption algorithm, developed by Ron Rivest, Adi Shamir, and Leonard Adleman at MIT.
Contact person at NGU for those interested in Stanford's security certificate programs.
Author of 'Security Engineering', a highly recommended book on security as an engineering discipline.
Co-author of 'Building Secure Software' and other security-related books.
Co-author of 'Foundations of Security'.
Co-author of 'Hacking Exposed Web 2.0' from Google's security team.
Maintains a website with a comprehensive list of security courses.
Co-author of 'Building Secure Software'.
A Googler on the security team and co-author of 'Foundations of Security'.
A security expert often quoted on the idea that security is a process, not a product.
Quoted regarding the lack of security in required computer science coursework and its consequences.
Professor at Stanford teaching CS 155, an example of a system security course.
Contact person at Google for those interested in security courses offered by the company.
Assisted in creating the sample web security course on code.google.com/edu.
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