Members
  • Total Members: 12816
  • Latest: t114563
Stats
  • Total Posts: 28524
  • Total Topics: 8240
  • Online Today: 993
  • Online Ever: 51419
  • (01. January 2010., 10:27:49)












Author Topic: HTTPS Connections aren't Secure anymore ?!  (Read 1084 times)

0 Members and 1 Guest are viewing this topic.

Samker

  • SCF Administrator
  • *****
  • Posts: 7206
  • KARMA: 291
  • Gender: Male
  • Whatever doesn't kill us makes us stronger.
    • SCforum.info - Samker's Computer Forum
HTTPS Connections aren't Secure anymore ?!
« on: 15. September 2012., 08:42:25 »


More details have emerged of a new attack that allows hackers to hijack encrypted web traffic - such as online banking and shopping protected by HTTPS connections.

The so-called CRIME technique lures a vulnerable web browser into leaking an authentication cookie created when a user starts a secure session with a website. Once the cookie has been obtained, it can be used by hackers to login to the victim's account on the site.

The cookie is deduced by tricking the browser into sending compressed encrypted requests for files to a HTTPS website and exploiting information inadvertently leaked in the process. During the attack, the encrypted requests - each of which contains the cookie - are continually modified by malicious JavaScript code, and the changing size of the compressed message is used to determine the cookie's contents character by character.

CRIME (Compression Ratio Info-leak Made Easy) was created by security researchers Juliano Rizzo and Thai Duong, who cooked up the BEAST SSL exploit last year. CRIME works on any version of TLS, the underlying technology that protects HTTPS connections. The number of requests an attacker would need to make to pull off the hijack is fairly low - up to six requests per cookie byte. Unlike the BEAST attack, CRIME can't be defeated by configuring the web server to use a different encryption algorithm.

Punters using web browsers that implement either TLS or SPDY compression are potentially at risk - but the vulnerability only comes into play if the victim visits a website that accepts the affected protocols. Support is widespread but far from ubiquitous.

The researchers worked with Mozilla and Google to ensure that both Firefox and Chrome are protected. Microsoft's Internet Explorer is not vulnerable to the attack, and only beta versions of Opera support SPDY. Smartphone browsers and other applications that rely on TLS may be vulnerable, according to Ars Technica.

"Basically, the attacker is running a script on Evil.com," Rizzo explained to Kaspersky Labs' Threatpost. "He forces the browser to open requests to Bank.com by, for example, adding <img alt=""> tags with the src pointing to Bank.com. Each of those requests contains data from mixed sources": http://threatpost.com/en_us/blogs/crime-attack-uses-compression-ratio-tls-requests-side-channel-hijack-secure-sessions-091312

Each encrypted request includes an image file name - a constantly changing detail that is generated by the malicious script; the browser's identification headers, which don't change; and the login cookie, the target of the attack. When the file name matches part of the login cookie, the size of the message drops because the compression algorithm removes this redundancy.

"The problem is that compression combines all those sources together," Rizzo added. "The attacker can sniff the packets and get the size of the requests that are sent. By changing the [file name] path, he could attempt to minimise the request size, ie: when the file name matches the cookie."

This brute-force attack has been demonstrated against several sites including Dropbox, Github and Stripe. Affected organisations were notified by the pair, and the websites have reportedly suspended support for the leaky encryption compression protocols. Ivan Ristic, director of engineering at Qualys, estimates 42 percent of sites support TLS compression.

The researchers will present their work at the Ekoparty security conference in Buenos Aires, Argentina next week. In the meantime, Jeremiah Grossman, founder and chief technology officer of WhiteHat Security, has a detailed take on the attack here: http://blog.whitehatsec.com/crime-mitm-and-xss/

(ElReg)

Samker's Computer Forum - SCforum.info

HTTPS Connections aren't Secure anymore ?!
« on: 15. September 2012., 08:42:25 »




Fintech

  • SCF Advanced Member
  • ***
  • Posts: 329
  • KARMA: 41
  • Gender: Male
Re: HTTPS Connections aren't Secure anymore ?!
« Reply #1 on: 15. September 2012., 19:41:50 »
It has been soon to more and more insecure entire web! Soon there does dare to do any more anything ! >:(
I'm old man but still alive as well :)

Samker

  • SCF Administrator
  • *****
  • Posts: 7206
  • KARMA: 291
  • Gender: Male
  • Whatever doesn't kill us makes us stronger.
    • SCforum.info - Samker's Computer Forum
Re: HTTPS Connections aren't Secure anymore ?!
« Reply #2 on: 16. September 2012., 10:01:41 »
It has been soon to more and more insecure entire web! Soon there does dare to do any more anything ! >:(

I agree with you Fintech, also it's important to PC users have at least some knowledge how to avoid risks and how to protect itself etc.

That is our (SCforum's) mission.  :bih:

 

 

With Quick-Reply you can write a post when viewing a topic without loading a new page. You can still use bulletin board code and smileys as you would in a normal post.

Name: Email:
Verification:
Type the letters shown in the picture
Listen to the letters / Request another image
Type the letters shown in the picture:
Second Anti-Bot trap, type or simply copy-paste below (only the red letters):www.scforum.info:

Enter your email address to receive daily email with 'SCforum.info - Samker's Computer Forum' newest content:

Terms of Use | Privacy Policy | Advertising