A network device is configured to receive an inbound packet from a first server device via a network tunnel, the first inbound packet including an outer header, a virtual private network (VPN) label, an inner header, and a data payload, the inner header including an inner source IP address of a source virtual machine. The processors are also configured to determine a first tunnel identifier, determine, based on the inner source IP address, a second tunnel identifier associated with a second server device hosting the source virtual machine, compare the second tunnel identifier with the first tunnel identifier to determine whether the tunnel on which the first inbound packet was received is the same as a tunnel used for forwarding traffic to the source virtual machine, and drop the inbound packet when the second tunnel identifier does not match the first tunnel identifier.

A proxy server receives from a client device a request for a network resource that is hosted at an origin server for a domain. The request is received at the proxy server as a result of a DNS request for the domain resolving to the proxy server. The origin server is one of multiple origin servers that belong to different domains that resolve to the proxy server and are owned by different entities. The proxy server retrieves the requested network resource. The proxy server determines that the requested resource is an HTML page. The proxy server scans the HTML page to locate one or more modification tokens that each indicates content that is subject to being modified. For at least one of the located modification tokens, the proxy server automatically modifies at least a portion of the content of the HTML page that corresponds to that modification token. The proxy server then transmits the modified HTML page to the client device.

Methods and systems for improving accuracy, speed, and efficiency of context-aware pattern matching are provided. According to one embodiment, a packet stream is received by a first stage of a hardware accelerator of a network device. A pre-matching process is performed by the first stage to identify a candidate packet that matches a string or over-flow pattern associated with access control (e.g., IPS or ADC) rules. A candidate rule is identified based on a correlation of results of the pre-matching process. The candidate packet is tokened to produce matching tokens and corresponding locations. A full-match process is performed on the candidate packet by a second stage of the hardware accelerator to determine whether it satisfies the candidate rule by performing one or more of (i) context-aware pattern matching, (ii) context-aware string matching and (iii) regular expression matching based on contextual information, the matching tokens and the corresponding locations.

Described embodiments provide systems and methods for protecting private data or confidential information. A device can receive a request from a client for a page from a server that includes confidential information to be verified with an owner of the confidential information. The device may be intermediary between the client and the server. Prior to providing the page to the client for rendering, the device may replace a first user interface (UI) element having the confidential information in the page, with a second UI element to obfuscate the confidential information. The device may receive an activation of the second UI element to request the owner to verify the confidential information from the client. The device may send to the client an update to the page to include an indication of whether the confidential information has been correctly verified with the owner.

A distributed security system can include instances of a compute engine that can execute either locally in security agents on client devices or as cloud instances in a security network. Event data can be processed by elements of the distributed security system according to centrally-defined ontological definitions and/or configurations. Bounding managers of local security agents can control how much event data is sent to the security network. A storage engine in the security network can store event data received from client devices, can route event data to other elements of the security network, including cloud instances of the compute engine. An experimentation engine of the security network can also at least temporarily adjust other elements of the distributed security system during experiments or tests.

The disclosure provides an approach for pre-filtering traffic in a logical network. One method includes receiving, by a hypervisor, a packet from a virtual computing instance (VCI) and determining a service path for the packet based on a service table. The method further includes setting, by the hypervisor, a pre-filter component as a next hop for the packet based on the service path. The method further includes receiving, by the pre-filter component, the packet. The method further includes making a determination, by the pre-filter component, of whether the packet requires processing by the security component. The method further includes performing, by the pre-filter component, based on the determination, one of: forwarding the packet to its destination and bypassing the security component; or forwarding the packet to the security component.

A security appliance may incorporate a touch screen or similar input/output interface, providing command and control over network functionality and configuration, without requiring log in via a network from another computing device. During denial of service attacks, commands from the local interface may be given priority access to processing resources and memory, allowing mitigating actions to be taken, such as shutting down ports, blacklisting packet sources, or modifying filter rules. This may allow the security device to address attacks without having to be manually rebooted or disconnected from the network.

A method includes receiving electronic data, extracting a first identifier from the electronic data, extracting first attributes from the electronic data, and searching a database for identifiers that match the first identifier to determine a number of matching identifiers. The method also includes determining that the number of matching identifiers exceeds a first threshold and searching the database for attributes associated with each of the matching identifiers to determine a subset of matching attributes. The method further includes calculating a specificity for the subset of matching attributes, determining that the specificity of the subset of matching attributes is less than or equal to a second threshold, and creating a filter based at least in part on the determination that the specificity of the subset of matching attributes is less than or equal to the second threshold.

Aspects of the disclosure relate to dynamically controlling access to linked content in electronic communications. A computing platform may receive, from a user computing device, a request for a uniform resource locator associated with an email message and may evaluate the request using one or more isolation criteria. Based on evaluating the request, the computing platform may identify that the request meets at least one isolation condition associated with the one or more isolation criteria. In response to identifying that the request meets the at least one isolation condition associated with the one or more isolation criteria, the computing platform may initiate a browser mirroring session with the user computing device to provide the user computing device with limited access to a resource corresponding to the uniform resource locator associated with the email message.

Systems and method of detecting and blocking malicious attacks on a computer network, including: receiving, by a memory constrained gateway in communication with the computer network, a communication request from at least one device, identifying the type of the at least one device based on the received communication request, verifying that the device is of an allowed type from a predetermined list of allowed device types, checking at least one signature of the received communication request of the allowed device to detect malicious signatures, and blocking communication requests from devices with at least one malicious signature.