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Questions tagged [flash]

Risks associated with the Adobe Flash animation file format and its use on the web, as well as Flash player applications. For flash drives, use the tag flash-memory.

68
votes
6answers
14k views

Why should we care about Adobe Flash?

I was under the impression that Adobe Flash was dead, and that browsers were no longer natively supporting Flash? Why therefore, is there a large amount of hype online about a new remote code ...
46
votes
3answers
5k views

For an end-user, is HTML5/JavaScript more secure than Flash?

I’m not talking about server-side security or even necessarily XSS vulnerabilities, as these are attacks on vulnerable services and do not use any pre-existing vulnerabilities on the client side to ...
19
votes
4answers
8k views

What tools are there to inspect Flash SWF files?

I am performing a penetration test against a website that uses Flash heavily. What tools can I use to examine the SWF file for vulnerabilities? From the Area51 proposal.
19
votes
2answers
1k views

What was behind the surge of Adobe Flash Player vulnerabilities/patches in 2015?

It's no secret that 2015 was a rough year, security-wise, for Adobe's Flash Player. Aside from Adobe itself beginning to essentially deprecate Flash development largely due to Flash Player's ...
14
votes
2answers
2k views

Why are Adobe Flash exploits found so often? [closed]

Over the last couple of years Adobe Flash published bug fixes for (zero-day) exploits so often, that the installation is already annoying. But why are exploits so often found in this particular ...
14
votes
6answers
4k views

Can Javascript/Flash verify the SSL connection to prevent “SSL Inspection”?

I'd like to determine if an SSL webpage is being debugged through Fiddler, or if it's going through an SSL Proxy. So some people may ask What is the point of re-validating SSL using javascript? ...
12
votes
4answers
4k views

Preventing reverse-engineering of client application

I have a web service which is used by a Flash client. Both the service and the Flash client is produced by me (read: my company). The Flash client communicates with the server over HTTPS. One of the ...
10
votes
3answers
2k views

How to perform penetration testing on a Flex application?

Possible Duplicate: What tools are there to inspect Flash SWF files? I have decompiled it, verified the source. All seems fine. Appscan also is not able to find anything in this case. But I just ...
9
votes
2answers
209 views

Secure Flash with click to play plugins in the enterprise

In the light of recent repeated critical Flash vulnerabilities there are recommendations to use browser plugins like click-to-play to prevent unnecessary Flash content from automatically loading with ...
8
votes
2answers
985 views

What is a Flash drive by download?

I've seen many people saying how some sites can infect your computer without actually clicking anything. They said that it was a "Flash Drive By" and it would use flash to download a file of any kind. ...
8
votes
2answers
13k views

Is the service join.me actually a huge security risk?

In case you don't know, there is a website called join.me which lets you do screen sharing from a browser, using a flash program that is on the web page. Until I encountered this service, I had no ...
7
votes
2answers
3k views

How to pentest Flash file on webapp with alowscriptaccess=samedomain?

In the course of a pentest I found a Flash movie file (swf) that loads another Flash movie through loadMovie. The HTML is this: <embed width="388" height="350" src="http://www.domain.com/...
6
votes
1answer
2k views

Should Flash be disabled, or are sandboxes secure enough?

Flash is a hot bed of vulnerabilities. Chrome contains a built in version of Flash, running in sandboxed mode. Obviously, this method is safer than running Flash as a plugin in either Firefox or IE. ...
6
votes
1answer
1k views

Detecting disabled Chrome plugins using JavaScript

My cable was on the fritz this weekend and I had to visit a friend to watch HBO online. Something weird happened that has been bothering me. I have disabled the Flash plugin on Chrome, since all ...
6
votes
3answers
265 views

find if 0-day flash bug was exploited (on a particular machine)

There have been several critical 0-day exploits in the past days/weeks in Flash alone. Nobody knows how long the 0-days have been exploited, and it is reasonable to expect that there are 0-days being ...
5
votes
4answers
733 views

Is flash or javascript a bigger security concern? [closed]

Many flash website whitelisting extensions for chrome (such as flashblock and flashcontrol) use javascript in order to selectively block Adobe Flash from functioning. Thus, In order to get this ...
5
votes
1answer
6k views

Why is Google Chrome blocking raw SWF playback?

If you attempt to visit the URL of a raw SWF file, Chrome 57 refuses to display and instead asks if you want to download, with the warning "This type of file can harm your computer". However, if you ...
5
votes
1answer
760 views

Is Adobe Flash Player installer redirect due to a malware?

When I go to http://get.adobe.com/flashplayer/ 'Install Now' will redirect me to their homepage without downloading the update or any explanation. What could be going on? Is some malware ...
4
votes
4answers
619 views

Is silverlight and Java running on the web browser capable of saving “state” into the user's local machines?

I am aware that even after we have cleared our cache and cookies, websites can still save files/information into our computer using Flash (Flash ever cookies), I was wondering does other plugins like ...
4
votes
3answers
6k views

How is it possible that a virus can infect the system if the browser is started with non-admin rights

If I open my web browser (for example firefox) in Windows 7 with activated UAC as normal user (non admin) a virus - which uses a security leak in my browser - will only gets privileges of the normal ...
4
votes
5answers
2k views

Is it dangerous to serve user-uploaded Flash (SWF) files?

I'm working on a site that has CMS functionality. I'm considering allowing users to upload Flash (.swf) files and then displaying them on my site. Is this a bad idea? Is there a way to do this ...
4
votes
1answer
855 views

Is it possible to log web sites that require Adobe Flash?

We would like to block the use of Flash on our internal network, but believe that several business-critical sites may still rely on that app. I'd love to be able to "watch" the traffic for several ...
4
votes
3answers
1k views

Flash ignores Content-Type header, allowing XSS?

I recently read that the Flash plugin ignores the Content-Type header in certain circumstances. In particular, you can give Flash a URL, and the Flash plugin will happily fetch the content at that ...
4
votes
1answer
1k views

CSRF and Flash/Flex

Flash and Flex clients can make RPC calls to a server using the NetConnection and AMF protocols. It's not uncommon to have these RPC calls setup to authenticate based on a cookie. I've heard ...
4
votes
1answer
89 views

Is filtering flash based on the mimetype enough to keep it out?

As flash is a real security mess I started blacklisting flash at our proxy by blocking any content with the mime type application/x-shockwave-flash which works pretty well as far as I can tell. The ...
4
votes
1answer
483 views

CSRF Bypass using ActionScript via weak CrossDomain.xml

I have a target which has weak CrossDomain.xml but it prevents CSRF attack looking at one of the custom HTTP headers. I found following actionscript on a couple of websites, which works perfectly ...
3
votes
2answers
2k views

Where do I get started in terms of learning how to exploit Java and Flash vulnerabilities? or browser exploitation in general

Another Java 0day was discovered today which got me thinking how browser exploitation (remote execution on clients browser) works. I am unable to find any books or resources online about browser ...
3
votes
3answers
771 views

Are flash cookies still a threat and that persistent?

One year (or more) ago flash cookies were really a problem, because they could not be deleted from within a browser. They were not managed by the browser but by the flash player. Flash cookies were ...
3
votes
2answers
703 views

Exploiting flash XSS holes

I have a URL to a flash file. Sample :- http://abc.mydomain.com/Findme.swf Now, there is a parameter called xmlpath as :- http://abc.mydomain.com/Findme.swf?xmlPath=something. Is it not that ...
3
votes
1answer
376 views

Adobe Flash and Meltdown / Spectre

Many browsers have received updates to protect against the Meltdown and Spectre attacks. I presume these patches relate (solely) to JavaScript execution within the browser. Java in the browser is as ...
3
votes
2answers
2k views

Can a website know whether I'm streaming or downloading content?

I'm taking a paid online course in which the videos are streamed through Flash. After much trouble such as quality fluctuations, unexpected changes in playback speed and frozen screens (also ...
3
votes
1answer
8k views

How to detect, inspect and delete a super cookie of a specific website? [closed]

Definition of supercookie from the paper I am reading: "Supercookies settle in parts of the system that are harder to erase, and include the usage of Flash Local Shared Objects and IE Local ...
3
votes
2answers
467 views

Is it possible to feed Firefox Flash plugin with controlled data for privacy reasons?

For privacy and security reasons, it would be strongly recommended to deactivate the Flash plugin in the browser. But I don't want to deactivate it, I want to fake privacy relevant information. ...
3
votes
1answer
76 views

How to know 3rd party ads are safe?

It seems many sites use 3rd party flash ads, those ads could be design to attack user. Do those site know which ads are safe or not? Or they just transfer any ads to user browser? In general, how to ...
3
votes
1answer
605 views

How can Flash detect my IP address even when I am behind a proxy?

I'm new to cybersecurity, but I always knew some basic things, or at least I thought so, until I found out that the Flash app may actually get my real IP address even if I'm behind elite proxy. How ...
3
votes
1answer
1k views

How is Cross Site Flashing performed?

I read about cross site flashing in the OWASP testing guide. I know the difference between XSS and XSF. But what I am looking for is how attackers perform a XSF attack. How is it possible since there ...
3
votes
1answer
2k views

XSS in SWF file

I have the following code in an SWF file that a vulnerability scanner marks as XSS: // Action0 { var __callResult_6 = getURL(_root.thankYou, "_self"); var __callResult_7 = stop(); ...
2
votes
4answers
2k views

Is it safer to design websites and servers with HTML5 rather than flash?

I run a small business, designing and building websites. Currently our websites we build use Adobe Flash. We are thinking about migrating to HTML 5, are there any security advantages in doing such a ...
2
votes
2answers
146 views

What could a malicious website do if you don't update Adobe Flash?

If you click on "Activate Adobe Flash" when Firefox warns that "this plugin is vulnerable and should be updated", you can still use Adobe Flash. What could a website do to you if the "plugin is ...
2
votes
1answer
453 views

What to do with an APK file containing Swf.Exploit.CVE_2015_0323-1 and ELF File?

I received an APK file from a source. Prior to installation, I ran a virus scan on it. The result had following main features: The file contained Swf.Exploit.CVE_2015_0323-1 It required android....
2
votes
2answers
704 views

The Spring Security framework recommends against using double-submit cookies to prevent CSRF. Is their concern legitimate?

I was about the Spring Security framework's CSRF protection to see how it works. Spring doesn't use the double-submit pattern, but instead associates the CSRF token with the user's session. The ...
2
votes
2answers
430 views

Is a browser with disabled scripts and disabled java enough against malware

Is a browser like Firefox with disabled scripts (for example via a plugin like no-script) and disabled Java enough to be protected against drive-by-malware from the internet. Of course this does not ...
2
votes
2answers
1k views

Why should crossdomain.xml be present if user-uploaded files exist?

In his book Michal Zalewski says: To protect your users, include a top-level crossdomain.xml file with the permitted-cross-domain-policies parameter set to master-only or by-content-type, even if ...
2
votes
1answer
192 views

Is it possible to encode a Flash exploit with msfencode?

I am using a Flash exploit from metasploit, exploit/multi/browser/adobe_flash_hacking_team_uaf. The Cisco FirePOWER services notice these signatures and drop the packets. I was wondering about the ...
2
votes
2answers
360 views

Is crossdomain policy file required by EVERY web application?

1) If a web application does NOT use any Flash content, does it require crossdomain / clientacess policy file ? 2) If a web application does not host crossdomain / clientaccess policy file, is it ...
2
votes
2answers
217 views

For untrusted user upload sites: what should the contents of crossdomain.xml and clientaccesspolicy.xml be?

Flash has a long history of ignoring MIME types of files and reading the file directly for executable content or for cross domain execution permissions. That means a malicious user can take advantage ...
2
votes
1answer
206 views

How can javascript files represent a flash-based XSS vulnerability?

I am hosting a static website (no PHP etc., just HTML/JavaScript/CSS) with a security-conscious hoster that proactively removes vulnerable files. This is fine with me. However, their last report ...
2
votes
1answer
144 views

Click to play plugins vs. AdBlock?

Reading through articles like Faked Flash-based ads... I'm wondering what is a better way to keep yourself safe from malvertising. Many people suggest setting your browser's plugin settings to "Click ...
2
votes
0answers
215 views

Flash Cross-Domain Proof of Concept

In the past, I have been able to successfully test insecure Flash cross-domain policies by using tools such as the followings: https://thehackerblog.com/crossdomain/ https://github.com/nccgroup/...
2
votes
0answers
1k views

USB Rubber Ducky Firmware Upgrade [closed]

I just erased my firmware, using dfu-programmer-0.7.2: $ dfu-programmer at32uc3b1256 erase Checking memory from 0x2000 to 0x3FFFF... Not blank at 0x2001. Erasing flash... Success Checking memory from ...