Dereferencing NULL pointers can create denial of service attacks. In this video, Mike Chapple explains the nature of this attack and ways to defend against it.
- [Instructor] Let's talk about another vulnerability … that might exist in software applications, … dereferencing NULL pointers. … First, we need to talk a little bit … about how operating systems manage memory. … Computer systems have large amounts of memory … available to them, and that memory is used … for many different purposes. … Some is used by the operating system. … Other parts are used by different applications … that run on the computer, and some is empty, awaiting use. … The amount of memory used by any one of these components … varies as activity on the system changes. … To be efficient, the operating system allocates memory … for different purposes when it receives a request … from an application or another operating system component. … It then assigns a portion of memory to that use, … providing a specific address and memory … as the location that may be used for that purpose. … For example, if an application requests … a chunk of memory to store a photograph, … the memory manager finds an available space in memory …
Author
Mike Chapple
Updated
11/13/2020Released
1/31/2020We are a CompTIA Partner. As such, we are able to offer CompTIA exam vouchers at a 10% discount. For more information on how to obtain this discount, please download these PDF instructions.
- Configuring vulnerability scans
- Reporting scan results
- Barriers to vulnerability remediation
- Analyzing scan reports
- Common server, endpoint, and network vulnerabilities
- Software security issues, such as SQL injection
- Access control vulnerabilities
Skill Level Advanced
Duration
Views
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Introduction
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Vulnerability management1m 24s
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Study resources1m 41s
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1. Creating a Vulnerability Management Program
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Identify scan targets5m 50s
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Scan frequency5m 7s
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2. Configuring and Executing Vulnerability Scans
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Scan configuration6m 16s
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Scan perspective5m 30s
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Scanner maintenance3m 19s
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Vulnerability scanning tools1m 51s
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3. Remediating Vulnerabilities
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Report scan results4m 43s
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Prioritize remediation3m 46s
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4. Analyzing Scan Results
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Interpreting CVSS scores3m 18s
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Analyzing scan reports4m 48s
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Correlating scan results2m 33s
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5. Common Vulnerabilities
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Server vulnerabilities5m 28s
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Endpoint vulnerabilities1m 44s
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Network vulnerabilities4m 29s
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6. Software Security Issues
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Preventing SQL injection5m 29s
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Privilege escalation2m 14s
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Directory traversal3m 16s
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Race conditions2m 39s
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Dereferencing NULL pointers2m 33s
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Third-party code5m 40s
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Interception proxies5m 22s
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7. Specialized Technology Vulnerabilities
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Industrial control systems5m 17s
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Internet of Things3m 26s
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Embedded systems3m 39s
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8. Access Control Vulnerabilities
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Password attacks8m 22s
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Impersonation attacks4m 45s
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Session hijacking3m 46s
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Eavesdropping attacks3m 51s
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Conclusion
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Next steps43s
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Video: Dereferencing NULL pointers