Microsoft Edge Chakra - Incorrectly Parses Object Patterns Exploit

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Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1308
 
When the Chakra's parser meets "{", at first, Chakra treats it as an object literal without distinguishing whether it will be an object literal(i.e., {a: 0x1234}) or an object pattern(i.e., {a} = {a: 1234}). After finishing to parse it using "Parser::ParseTerm", if it's an object pattern, Chakra converts it to an object pattern using the "ConvertObjectToObjectPattern" method.
 
The problem is that "Parser::ParseTerm" also parses ".", etc. using "ParsePostfixOperators" without proper checks. As a result, an invalid syntax(i.e., {b = 0x1111...}.c) can be parsed and "ConvertObjectToObjectPattern" will fail to convert it to an object pattern.
 
In the following PoC, "ConvertObjectToObjectPattern" skips "{b = 0x1111...}.c". So the object literal will have incorrect members(b = 0x1111, c = 0x2222), this leads to type confusion(Chakra will think "c" is a setter and try to call it).
 
PoC:
-->
 
function f() {
    ({
        a: {
            b = 0x1111,
            c = 0x2222,
        }.c = 0x3333
    } = {});
}
 
f();

#  0day.today [2018-02-05]  #