Vulnerabilities / Threats
7/21/2009
05:11 PM
Connect Directly
LinkedIn
Twitter
Google+
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
Flash Poll
Current Issue
Cartoon
Video
Slideshows
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2014-0103
Published: 2014-07-29
WebAccess in Zarafa before 7.1.10 and WebApp before 1.6 stores credentials in cleartext, which allows local Apache users to obtain sensitive information by reading the PHP session files.

CVE-2014-0475
Published: 2014-07-29
Multiple directory traversal vulnerabilities in GNU C Library (aka glibc or libc6) before 2.20 allow context-dependent attackers to bypass ForceCommand restrictions and possibly have other unspecified impact via a .. (dot dot) in a (1) LC_*, (2) LANG, or other locale environment variable.

CVE-2014-2226
Published: 2014-07-29
Ubiquiti UniFi Controller before 3.2.1 logs the administrative password hash in syslog messages, which allows man-in-the-middle attackers to obtains sensitive information via unspecified vectors.

CVE-2014-3541
Published: 2014-07-29
The Repositories component in Moodle through 2.3.11, 2.4.x before 2.4.11, 2.5.x before 2.5.7, 2.6.x before 2.6.4, and 2.7.x before 2.7.1 allows remote attackers to conduct PHP object injection attacks and execute arbitrary code via serialized data associated with an add-on.

CVE-2014-3542
Published: 2014-07-29
mod/lti/service.php in Moodle through 2.3.11, 2.4.x before 2.4.11, 2.5.x before 2.5.7, 2.6.x before 2.6.4, and 2.7.x before 2.7.1 allows remote attackers to read arbitrary files via an XML external entity declaration in conjunction with an entity reference, related to an XML External Entity (XXE) is...

Best of the Web
Dark Reading Radio