Critical OpenSSL Patch Available. Patch Now!

Published: 2014-06-05
Last Updated: 2014-06-05 21:08:24 UTC
by Johannes Ullrich (Version: 2)
11 comment(s)

[Webcast Correction] Important correction to the webcast. The MITM attack does not just affect DTLS. It does affect TLS (TCP) as well. 

Quick Q&A Summary from the webcast:

- The MITM vulnerablity only affects servers that run OpenSSL 1.0.1 but all clients. Both have to be vulnerable to exploit this problem.
- The MITM vulnerability is not just DTLS (sorry, had that wrong during the webcast)
- Common DTLS applications: Video/Voice over IP, LDAP, SNMPv3, WebRTC
â??- Web servers (https) can not use DTLS.
- OpenVPN's "auth-tls" feature will likely mitigate all these vulnerabilities
- Even if you use "commercial software", it may still use OpenSSL.


The OpenSSL team released a critical security update today. The update patches 6 flaws. 1 of the flaws (CVE-2014-0195) may lead to arbitrary code execution. [1]

All versions of OpenSSL are vulnerable to CVE-2014-0195, but this vulnerability only affects DTLS clients or servers (look for SSL VPNs... not so much HTTPS).

I also rated CVE-2014-0224 critical, since it does allow for MiTM attacks, one of the reasons you use SSL. But in order to exploit this issue, both client and server have to be vulnerable, and only openssl 1.0.1 is vulnerable on servers (which is why I stuck with "important" for servers). The discoverer of this vulnerability released details here: .

CVE-2010-5298 does allow third parties to inject data into existing SSL connections. This could be a big deal, but according to the OpenSSL advisory, the SSL_MODE_RELEASE_BUFFERS feature is usually not enabled. 

Make sure you update to one of these OpenSSL versions:

OpenSSL 0.9.8za   (openssl ran out of letters, so instead of calling this one 'z' they call it 'za' to allow for future releases. However, this *may* be the last 0.9.8 release).
OpenSSL 1.0.0m
OpenSSL 1.0.1h

CVE Name Impact Vulnerable Versions Client Server
CVE-2014-0224 SSL/TLS MITM Vulnerability MiTM Server: 1.0.1, Client: 0.9.8,1.0.0,1.0.1 (both have to be vulnerable) Critical Important
CVE-2014-0221 DTLS recursion flaw DoS 0.9.8,1.0.0,1.0.1 Important Not Affected
CVE-2014-0195 DTLS invalid fragment vulnerability Code Exec. 0.9.8,1.0.0,1.0.1 Critical Critical
CVE-2014-0198 SSL_MODE_RELEASE_BUFFERS NULL pointer dereference DoS 1.0.0,1.0.1
(neither affected in default config)
Important Important
CVE-2010-5298 SSL_MODE_RELEASE_BUFFERS session injection DoS or Data Injection 1.0.0, 1.0.1
(in multithreaded applications, not in default config)
Important Important
CVE-2014-3470 Anonymous ECDH Denial of Service DoS 0.9.8, 1.0.0, 1.0.1 Important Not Affected

Vendor Information:

Amazon AWS


Johannes B. Ullrich, Ph.D.

Keywords: openssl
11 comment(s)


DTLS is also used in certain voice systems, though I don't know which, if any, use OpenSSL. These devices would tend to remain unpatched in many environments.

WebRTC appears to use it as well.
Based on the Heartbleed notice, most of Cisco's Telepresence equipment uses OpenSSL. Impact will depend on configuration of course.


Cisco Jabber also uses OpenSSL, and may use DTLS for voice and video.
Just a note... As of this moment (1319 EST)...
Doing a search on CVE-2014-0195 on the NIST NVD will result in "Unable to find vuln CVE-2014-0195" or 0 entries found.

The MITRE reference to CVE-2014-0195 states the CVE entry is "Reserved".

Maybe there is ongoing impact assessment??
Will need to check on it later.
Note to ISC Handler: I sent this message regarding the June 5th OpenSSL diary post earlier today, but it didn't show up in the post. Resending just in case.

For CVE-2014-0195 (as of 1500 EST today):
If you go to the MITRE site, the entry is listed as "Reserved" with no useful data about the vulnerability.
If you go to the NIST NVD, a search will result in 0 records. A direct GET statement will result in "Unable to find vuln CVE-2014-0195"

Maybe the CVE impact is still under assessment??
Will need to check on this.
yes, it can take a day or so for the CVE entries to be active.
I missed the webcast. How long does it usually take before the webcast shows up in archive section?
should show up soon (couple hours after it finished) . I will likely record a video later today (evening) with some updated info.
Can you clarify how you came to understand that TCP was also affected and not just UDP? We have been looking for other sources to confirm, but can't find any other write-ups with the specifics. Thanks.
There are two write-ups with details about CVE-2014-0224:

The original by the Japanese discoverer of the vulnerability

A secondary writeup by Adam Langley

Neither is a terrible easy read, and both heavily reference prior DTLS bugs. But neither writeup excludes TLS.
VMware has patch for ESXi 5.5 -

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