Vulnerabilities tagged 'interesting exploit'

[GitLab] Stored XSS in Notes (with CSP bypass)

It seems that the syntax highlighting filter will read the data-sourcepos attribute rather permissively including newlines and angle brackets. This value gets reflected back out into the page where the browser will end up interpreting as HTML some of the text the backend throught was in the attribute.

 

FORCEDENTRY: Sandbox Escape

Follow-up to the December post which covered an int overflow in the CoreGraphics PDF parser for the JBIG2 image format, which implemented a weird machine / mini architecture to execute code. This post covers the sandbox escape that was chained with it, which unlike the first bug, is a logic issue rather than a memory corruption.

 

Solving DOM XSS Puzzles

We’ve got two XSS “puzzles” in unnamed bounty programs, each with somewhat interesting exploit strategies. The original post is worth a read for more insight into the thought process leading to the discovery of each step.

 

Spook.js - Speculative Type Confusion

The cool part of this paper is the speculative type confusion attack where the browser’s optimizer is trained to expect a memory access will be a uint8 array, and the CPU branch predictor that it will always go down that path. Then the attack changes both conditions leading to the CPU speculatively executing the uint8 access using data from another object, aligned in memory such that two 32bit value in JavaScript become one 64bit value.

 
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