A vulnerability in OpenSSL Transport Layer Security (TLS) clients could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.
The vulnerability is due to way the affected software performs anonymous Elliptic Curve Diffie-Hellman (ECDH) key exchange. An unauthenticated, remote attacker could exploit this vulnerability by sending a crafted handshake packet to a targeted system. A successful exploit could cause the affected application to crash, resulting in a DoS condition.
OpenSSL has confirmed the vulnerability and released software updates.
Indicators of Compromise
The following OpenSSL versions are affected:
OpenSSL versions prior to 0.9.8za
OpenSSL versions prior to 1.0.0m
OpenSSL versions prior to 1.0.1h
The vulnerability is due to way the affected software performs anonymous ECDH key exchange.
An unauthenticated, remote attacker could exploit this vulnerability by sending a crafted handshake packet to a targeted system. A successful exploit could cause the affected application to crash, resulting in a DoS condition.
To exploit this vulnerability, an attacker would need to send a crafted handshake request to the targeted device. Depending on where the system resides in an environment, an attacker may need to bypass firewall restrictions or other protection measures, which may reduce the likelihood of a successful exploit.
OpenSSL TLS clients that have anonymous ECDH ciphersuite enabled are affected by this vulnerability.
Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to have network access.
Administrators can help protect affected systems from external attacks by using a solid firewall strategy.
Administrators are advised to monitor affected systems.
OpenSSL.org has released a security advisory at the following link: CVE-2014-3470
Apple has released security advisory at the following link: HT6443
Blue Coat has released a security advisory at the following link: SA80
Oracle has released updated software for registered customers at the following link: Solaris 18.104.22.168.0
Red Hat has released updated software for registered subscribers at the following link: Red Hat Network. Red Hat packages can be updated on Red Hat Enterprise Linux versions 5 and later using the yum tool.
Research In Motion customers are advised to follow the resolution steps mentioned in the vendor advisory to mitigate this vulnerability.
VMware has released a patch at the following link:
THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM
THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.
A standalone copy or paraphrase of the text of this document that omits the distribution URL is an uncontrolled copy and may lack important information or contain factual errors. The information in this document is intended for end users of Cisco products
Cisco Multivendor Vulnerability Alerts respond to vulnerabilities identified in third-party vendors' products. These alerts contain information compiled from diverse sources and provide comprehensive technical descriptions, objective analytical assessments, workarounds and practical safeguards, and links to vendor advisories and patches.