Risk
7/8/2013
11:48 AM
Connect Directly
RSS
E-Mail
50%
50%

Encrypted IM Tool Vulnerable To Eavesdropping

Bugs in instant messaging encryption tool Cryptocat left users' group chats vulnerable to eavesdropping for over a year, says security researcher.

The Syrian Electronic Army: 9 Things We Know
(click image for larger view)
The Syrian Electronic Army: 9 Things We Know
Cryptocat, a free tool designed to encrypt online chats, has been updated to fix errors that would have allowed an attacker to eavesdrop on chats. The vulnerability resulted from developers using below-minimum public key sizes or iterations. As a result, anyone who used a vulnerable version of Cryptocat to hold a group conversation, or who communicated with anyone using the software, could have had their communications easily intercepted.

That warning was sounded by security researcher Steve Thomas, who detailed the errors in a blog post. "If you used group chat in Cryptocat from Oct. 17th, 2011 to June 15th, 2013, assume your messages were compromised," he said. "Also if you or the person you are talking to has a version from that time span, then assume your messages are being compromised."

Thomas built a tool he calls DecryptoCat, which "cracks the ECC public keys generated by Cryptocat versions 1.1.147 through 2.0.41" in about a day, he said. Using the information generated by the tool, it would then take just a few minutes to crack any vulnerable Cryptocat key. Based on the coding errors he found, Thomas had harsh words for the chat tool's developers, who he labeled as being "incompetent." "I feel bad about calling them incompetent, but it is true. If you mess up in all the places I cared to check ... that's incompetence," he said.

[ Need an encryption how-to? Read 5 Rules For (Almost) Painless Encryption. ]

In response, Cryptocat issued an apology, and said that the bug detailed by Thomas -- which they claimed left users' communications vulnerable for only seven months -- was rapidly fixed. "The vulnerability was quickly resolved and an update was pushed," said the Cryptocat development blog post. "We sincerely thank Steve for his invaluable effort."

The developers emphasized that it's impossible to keep software entirely free from bugs. "Bad bugs happen all the time in all projects," they said. "Cryptocat is not any different from any of the other notable privacy, encryption and security projects, in which vulnerabilities get pointed out on a regular basis and are fixed. Bugs will continue to happen in Cryptocat, and they will continue to happen in other projects as well. This is how open source security works."

Previous
1 of 2
Next
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-2013-7392
Published: 2014-07-22
Gitlist allows remote attackers to execute arbitrary commands via shell metacharacters in a file name to Source/.

CVE-2014-2385
Published: 2014-07-22
Multiple cross-site scripting (XSS) vulnerabilities in the web UI in Sophos Anti-Virus for Linux before 9.6.1 allow local users to inject arbitrary web script or HTML via the (1) newListList:ExcludeFileOnExpression, (2) newListList:ExcludeFilesystems, or (3) newListList:ExcludeMountPaths parameter t...

CVE-2014-3518
Published: 2014-07-22
jmx-remoting.sar in JBoss Remoting, as used in Red Hat JBoss Enterprise Application Platform (JEAP) 5.2.0, Red Hat JBoss BRMS 5.3.1, Red Hat JBoss Portal Platform 5.2.2, and Red Hat JBoss SOA Platform 5.3.1, does not properly implement the JSR 160 specification, which allows remote attackers to exec...

CVE-2014-3530
Published: 2014-07-22
The org.picketlink.common.util.DocumentUtil.getDocumentBuilderFactory method in PicketLink, as used in Red Hat JBoss Enterprise Application Platform (JBEAP) 5.2.0 and 6.2.4, expands entity references, which allows remote attackers to read arbitrary code and possibly have other unspecified impact via...

CVE-2014-4326
Published: 2014-07-22
Elasticsearch Logstash 1.0.14 through 1.4.x before 1.4.2 allows remote attackers to execute arbitrary commands via a crafted event in (1) zabbix.rb or (2) nagios_nsca.rb in outputs/.

Best of the Web
Dark Reading Radio
Archived Dark Reading Radio
Where do information security startups come from? More important, how can I tell a good one from a flash in the pan? Learn how to separate ITSec wheat from chaff in this episode.