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
Partner Perspectives
What's This?
In a digital world inundated with advanced security threats, Intel Security seeks to transform how we live and work to keep our information secure. Through hardware and software development, Intel Security delivers robust solutions that integrate security into every layer of every digital device. In combining the security expertise of McAfee with the innovation, performance, and trust of Intel, this vision becomes a reality.

As we rely on technology to enhance our everyday and business life, we must too consider the security of the intellectual property and confidential data that is housed on these devices. As we increase the number of devices we use, we increase the number of gateways and opportunity for security threats. Intel Security takes the “security connected” approach to ensure that every device is secure, and that all security solutions are seamlessly integrated.
Featured Writers
White Papers
Cartoon
Current Issue
Dark Reading's October Tech Digest
Fast data analysis can stymie attacks and strengthen enterprise security. Does your team have the data smarts?
Flash Poll
Video
Slideshows
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2014-7877
Published: 2014-10-30
Unspecified vulnerability in the kernel in HP HP-UX B.11.31 allows local users to cause a denial of service via unknown vectors.

CVE-2014-3051
Published: 2014-10-29
The Internet Service Monitor (ISM) agent in IBM Tivoli Composite Application Manager (ITCAM) for Transactions 7.1 and 7.2 before 7.2.0.3 IF28, 7.3 before 7.3.0.1 IF30, and 7.4 before 7.4.0.0 IF18 does not verify X.509 certificates from SSL servers, which allows man-in-the-middle attackers to spoof s...

CVE-2014-3668
Published: 2014-10-29
Buffer overflow in the date_from_ISO8601 function in the mkgmtime implementation in libxmlrpc/xmlrpc.c in the XMLRPC extension in PHP before 5.4.34, 5.5.x before 5.5.18, and 5.6.x before 5.6.2 allows remote attackers to cause a denial of service (application crash) via (1) a crafted first argument t...

CVE-2014-3669
Published: 2014-10-29
Integer overflow in the object_custom function in ext/standard/var_unserializer.c in PHP before 5.4.34, 5.5.x before 5.5.18, and 5.6.x before 5.6.2 allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via an argument to the unserialize function ...

CVE-2014-3670
Published: 2014-10-29
The exif_ifd_make_value function in exif.c in the EXIF extension in PHP before 5.4.34, 5.5.x before 5.5.18, and 5.6.x before 5.6.2 operates on floating-point arrays incorrectly, which allows remote attackers to cause a denial of service (heap memory corruption and application crash) or possibly exec...

Best of the Web
Dark Reading Radio
Archived Dark Reading Radio
Follow Dark Reading editors into the field as they talk with noted experts from the security world.