Update Browser Browser Security Updates 3

Question 1

What is a 'heap buffer overflow' vulnerability in browsers?

Accepted Answer

Writing more data than a heap-allocated buffer can hold, potentially allowing attackers to overwrite memory

Answer

Heap buffer overflow is a memory corruption vulnerability where writing beyond a buffer's bounds can allow attackers to overwrite adjacent memory and execute code.

Question 2

What does browser 'HTTPS-Only Mode' protect against and when was it introduced?

Accepted Answer

Protects against man-in-the-middle attacks by refusing unencrypted HTTP connections; introduced in Firefox 83 and Edge 92

Answer

HTTPS-Only Mode forces all connections to use HTTPS, preventing exposure to unencrypted traffic and man-in-the-middle attacks.

Question 3

What is 'speculative execution' and why did it affect browser security updates?

Accepted Answer

A CPU optimization technique exploited by Spectre/Meltdown attacks, leading browsers to add mitigations in updates

Answer

Spectre and Meltdown exploited CPU speculative execution to read protected memory; browsers responded with patches reducing timer precision and adding site isolation.

Question 4

Why is it dangerous to continue using a browser version after it reaches 'end of life'?

Accepted Answer

No more security patches will be issued, leaving known vulnerabilities permanently unpatched

Answer

End-of-life browsers no longer receive security patches, meaning any subsequently discovered vulnerabilities will never be fixed.

Question 5

What is the 'Site Isolation' feature in browsers and how does it improve security?

Accepted Answer

Renders each website in a separate process to prevent cross-site data leakage

Answer

Site Isolation places each website's content in a separate process, preventing malicious sites from accessing data from other sites in memory.

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Update Browser Browser Security Updates 3