A vulnerability in OpenSSL could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.
The vulnerability is due to improper handling of certain Datagram Transport Layer Security (DTLS) ServerHello requests by a system running the affected application. An unauthenticated, remote attacker could exploit this vulnerability by sending a crafted DTLS handshake request to a targeted system. A successful exploit could cause the affected application to recurse and 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 improper handling of certain DTLS ServerHello requests by a system running an affected version of OpenSSL.
An unauthenticated, remote attacker could exploit this vulnerability by sending a crafted DTLS handshake request to a targeted system. A successful exploit could cause the affected application to recurse and crash, resulting in a DoS condition.
To exploit this vulnerability, an attacker would need to send a crafted DTLS handshake request to the targeted device. Depending on where the targeted 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.
Systems that have applications using OpenSSL as a DTLS client 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-2014-0221
BlackBerry has released a security advisory at the following link: KB36051
Blue Coat has released a security advisory at the following link: SA80
CentOS packages can be updated using the up2date or yum command.
Oracle has released updated software for registered customers at the following link: Solaris 220.127.116.11.0
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.
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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.