A vulnerability due to the design of most modern CPUs could allow a local attacker to access sensitive information on a targeted system.
The vulnerability is due to improper implementation of the speculative execution of instructions by the affected software. This vulnerability can by triggered by utilizing branch target injection. An attacker could exploit this vulnerability by executing arbitrary code and performing a side-channel attack on a targeted system. A successful exploit could allow the attacker to read sensitive memory information.
Proof-of-concept code that demonstrates an exploit of this vulnerability is publicly available.
Intel has confirmed the vulnerability and updates are available.
This vulnerability is caused by branch target injection, which exploits speculative execution, also known as Spectre attacks.
Cisco is aware of recently published security research related to speculative execution in modern CPU architectures. Our team is following our well-established process to investigate all aspects of the issue and evaluate any potential impact on Cisco products. If something new is found that our customers need to be aware of and respond to, we will share it through our established PSIRT disclosure processes.
Administrators are advised to contact the vendor regarding future updates and releases, or apply the appropriate third-party updates.
Administrators are advised to allow only trusted users to access local systems.
Administrators can apply Snort SIDs 45357-45368 to help prevent attacks that attempt to exploit this vulnerability.
Administrators are advised to monitor affected systems.
Xen has released a security advisory at the following link: XSA-254
Apple security updates can be downloaded by using the Software Update feature of the Mac App Store. For iOS devices, users can install the updates by using the Check for Updates button in Apple iTunes or the Software Update feature of the iOS device. After applying the update, users are encouraged to verify that the iOS device was updated and is running iOS version 11.2. Users can verify that the update was applied by navigating to Settings > General > About on the device.
CentOS packages can be updated by using the up2date or yum command.
IBM has released software updates, as described in the "Remediation" section of the IBM security bulletin.
Mozilla has released software updates at the following link: Firefox 57.0.4
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 by using the yum tool.
VMware has released software patches at the following links:
VMware has released an additional security advisory and software patches to address the Intel CPU process prediction information disclosure vulnerability. Red Hat has also released an additional security advisory and updated packages to address this vulnerability.
Updated to add Snort signatures. Mozilla has released an advisory and updated software, and Red Hat has released additional security advisories and updated packages to address the Intel CPU process prediction information disclosure vulnerability.
Red Hat Enterprise Linux ELS (Extended Life Cycle Support)
5 (x86_64, i386) | (for IBM z Systems) 5 (s390x)
Red Hat Enterprise Linux for IBM z Systems
6 (s390x) | 7 (s390x) | Extended Update Support 7.3 (s390x) | Extended Update Support 6.7 (s390x) | Extended Update Support 7.4 (s390x)
Red Hat Enterprise Linux for Power
big endian 6 (ppc64) | big endian 7 (ppc64) | little endian 7 (ppc64le) | little endian - Extended Update Support 7.3 (ppc64le) | big endian - Extended Update Support 7.3 (ppc64) | big endian - Extended Update Support 6.7 (ppc64) | little endian - Extended Update Support 7.4 (ppc64le) | big endian - Extended Update Support 7.4 (ppc64)
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux Server
6 (x86_64, i386) | 7 (x86_64) | 4 Year Extended Update Support 7.4 (x86_64) | 4 Year Extended Update Support 7.3 (x86_64) | 4 Year Extended Update Support 7.2 (x86_64)
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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.