seeing is believing

WebKit JSC ObjectPatternNode::appendEntry Use-After-Free

WebKit JSC ObjectPatternNode::appendEntry Use-After-Free
Posted Jul 25, 2017
Authored by Google Security Research, lokihardt

WebKit JSC suffers from an ObjectPatternNode::appendEntry stack use-after-free.

tags | advisory
MD5 | 312ee9e952cc9b3ae2170307e103b4cc

WebKit JSC ObjectPatternNode::appendEntry Use-After-Free

Change Mirror Download
 WebKit: JSC: Stack-Use-After-Free in ObjectPatternNode::appendEntry 




Here's a snippet of ObjectPatternNode::appendEntry.

void appendEntry(const JSTokenLocation&, ExpressionNode* propertyExpression, DestructuringPatternNode* pattern, ExpressionNode* defaultValue, BindingType bindingType)
{
m_targetPatterns.append(Entry{ Identifier(), propertyExpression, false, pattern, defaultValue, bindingType });
}

Here's the definition of Entry.

struct Entry {
const Identifier& propertyName;
ExpressionNode* propertyExpression;
bool wasString;
DestructuringPatternNode* pattern;
ExpressionNode* defaultValue;
BindingType bindingType;
};

The Identifier object created by "Identifier()" is in the stack. So it will get freed in the end of the appendEntry method.

PoC:
var {[a]: b, ...[]} = {};



This bug is subject to a 90 day disclosure deadline. After 90 days elapse
or a patch has been made broadly available, the bug report will become
visible to the public.




Found by: lokihardt

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