Vulnerabilities / Threats
7/21/2009
05:11 PM
Connect Directly
Google+
LinkedIn
Twitter
RSS
E-Mail
50%
50%

Researchers Bypass Secure Web Connections

EV SSL certificates are supposed to help people feel more secure online. But at Black Hat next week, two researchers plan to disclose a way around SSL protection.

Security researchers have found a way to intercept data during online interactions with SSL-protected Web sites and plan to present their findings at the Black Hat security conference in Las Vegas next week.

Mike Zusman, principal consultant at Intrepidus Group, and Alex Sotirov, an independent security researcher, have identified a Web browser design flaw that allows an attacker to conduct a "Man-in-the-Middle" attack against Web sites with Extended Validation (EV) Secure Sockets Layer (SSL) certificates.

EV SSL certificates convey more information than standard SSL certificates and require a more extensive certification process by the issuing Certificate Authority. Their aim is to help Internet users feel confident that the Web sites they're doing business with are safe, and not phishing sites masquerading as legitimate sites.

The most recent versions of Apple Safari, Google Chrome, Microsoft Internet Explorer, Mozilla Firefox, and Opera all support EV SSL.

Zusman and Sotirov call their attack "SSL Rebinding" and claim that it can be used to sniff sensitive data as it leaves the user's browser or to conduct a browser cache poisoning attack against EV SSL Web sites.

The leading "S" in SSL may stand for "Secure," but security researchers are proving that's something of an overstatement. In February, at the Washington, D.C. Black Hat Conference, security researcher Moxie Marlinspike demonstrated the frailty of SSL by capturing 117 e-mail accounts, 16 credit card numbers, seven PayPal logins, and some 300 other miscellaneous secure login sessions in only 24 hours. He used software of his own design called "sslstrip," which he subsequently released.

The sslstrip software scans plain-text HTTP traffic for HTTPS links and rewrites them in the insecure HTTP protocol. It then adds fake security indicators, like the yellow lock icon, to create the illusion of security.

In an e-mail, Zusman said that the research he conducted with Sotirov differs from the work done by Marlinspike.

"Our attacks allow the browser to display the actual trust indicators that a browser shows during an EV SSL session, specifically the 'green badge' that displays the legal identity of the organization running the Web site," he said. "Like sslstrip, which downgrades the connection from HTTPS to HTTP, our tool downgrades the victim's connection from EV SSL to non-EV SSL. However, the similarities end there, as the methods the two tools use are very different."

Zusman and Sotirov are scheduled to present their findings on Thursday, July 30.

InformationWeek Analytics has published an analysis of the current state of identity management. Download the report here (registration required).

Comment  | 
Print  | 
More Insights
Register for Dark Reading Newsletters
White Papers
Cartoon
Current Issue
Flash Poll
Video
Slideshows
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2012-1556
Published: 2014-09-12
Cross-site scripting (XSS) vulnerability in Synology Photo Station 5 for DiskStation Manager (DSM) 3.2-1955 allows remote attackers to inject arbitrary web script or HTML via the name parameter to photo/photo_one.php.

CVE-2014-2008
Published: 2014-09-12
SQL injection vulnerability in confirm.php in the mPAY24 payment module before 1.6 for PrestaShop allows remote attackers to execute arbitrary SQL commands via the TID parameter.

CVE-2014-2009
Published: 2014-09-12
The mPAY24 payment module before 1.6 for PrestaShop allows remote attackers to obtain credentials, the installation path, and other sensitive information via a direct request to api/curllog.log.

CVE-2014-4735
Published: 2014-09-12
Cross-site scripting (XSS) vulnerability in MyWebSQL 3.4 and earlier allows remote attackers to inject arbitrary web script or HTML via the table parameter to index.php.

CVE-2014-5259
Published: 2014-09-12
Cross-site scripting (XSS) vulnerability in cattranslate.php in the CatTranslate JQuery plugin in BlackCat CMS 1.0.3 and earlier allows remote attackers to inject arbitrary web script or HTML via the msg parameter.

Best of the Web
Dark Reading Radio
Archived Dark Reading Radio
CISO Insider: An Interview with James Christiansen, Vice President, Information Risk Management, Office of the CISO, Accuvant