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CVE-2020-9802 is a logic flaw in WebKit's JavaScriptCore DFG JIT compiler, affecting WebKitGTK and WPE WebKit before 2.28.3 as well as Apple WebKit consumers. Incorrect common-subexpression elimination modeled ArithNegate operations without their arithmetic mode: a checked negation could consequently be substituted with an unchecked negation. By exercising signed 32-bit INT_MIN overflow, an attacker can violate JIT integer-range assumptions and cause improper bounds-check elimination. Crafted JavaScript can thereby obtain out-of-bounds access on the JavaScriptCore heap, including corruption of adjacent JSArray metadata, which can be developed into addrof, fakeobj, and arbitrary memory read/write primitives.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos (1 hidden).
This repository contains a browser-based exploit for CVE-2020-9802, a JIT bug in the WebKit engine affecting iOS devices. The exploit is implemented as a single HTML file ('exploit.html') containing JavaScript that manipulates memory structures to achieve arbitrary code execution. The exploit is specifically tailored for the iPod7,1 running iOS 12.5.7, using hardcoded offsets and targeting the WebKit JIT vulnerability. Upon successful exploitation, a ROP chain is executed to launch the Calculator app, demonstrating code execution outside the browser sandbox. The README provides context, credits, and references to the original research and similar implementations. No network endpoints or external domains are contacted; the exploit operates entirely within the browser context. The code is a proof-of-concept and is not weaponized for broader use.
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9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
WebKitGTK logic flaw that may permit arbitrary code execution.
A CWE-841 logic flaw in WebKitGTK and WPE WebKit prior to version 2.28.3 that can allow arbitrary code execution when a user processes attacker-crafted web content. It is rated CVSS 8.8 (High) with network attack vector, no privileges required, and required user interaction.
A publicly available WebKit/Safari remote code execution vulnerability used by the LightSpy operators for initial access to iOS devices.
A logic flaw in WebKitGTK and WPE WebKit that can allow arbitrary code execution when a user processes maliciously crafted web content.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.