Attackers are incentivized to cloak their attacks to avoid detection, keep attack chains alive longer, and make investigations more complicated. One type of cloaking involves steganography, whereby an attacker embeds hidden data inside an otherwise innocuous file. For instance, an attacker might embed their malicious code inside an image file, not in an attempt toContinue reading “Attack Techniques: Steganography”
Category Archives: security
ServiceWorkers vs. Network Filtering
In a recent post, I explored how the design of network security features impact the tradeoffs of the system. In that post, I noted that integrating a URL check directly into the browser provides the security check with the best context, because it allows the client to see the full URL being checked and ifContinue reading “ServiceWorkers vs. Network Filtering”
Security: The Impact of Time
Two years ago, I wrote a long post about the importance of time, and how practical time machines can help reduce emergencies into more mundane workitems. Today, we revisit the same topic, with a focus on the security impact of time. Races In many ways, the story of modern security is a story about races,Continue reading “Security: The Impact of Time”
Beware: URLs are Pointers to Mutable Entities
Folks often like to think of URLs as an entity that can be evaluated: “Is it harmless, or is it malicious?” In particular, vendors of security products tend to lump URLs in with other IoCs (indicators of compromise) like the hash of a known-malicious file, a malicious/compromised digital certificate, or a known-malicious IP address. Unfortunately,Continue reading “Beware: URLs are Pointers to Mutable Entities”
Security Tradeoffs: Privacy
In a recent post, I explored some of the tradeoffs engineers must make when evaluating the security properties of a given design. In this post, we explore an interesting tradeoff between Security and Privacy in the analysis of web traffic. Many different security features and products attempt to protect web browsers from malicious sites byContinue reading “Security Tradeoffs: Privacy”