Abstract:
One embodiment of an apparatus for monitoring from a first location in a computer network traffic emanating from a source at a second location in the network, the apparatus comprising means at the first location for detecting traffic emanating from the source and means for monitoring the number, per unit time, of distinct destinations of the traffic that lie outside a first set specifying familiar destinations of the traffic. This monitoring process can trigger various responses such as the isolation of the source from the network. Other systems and methods are also provided.
Abstract:
A computer program product for monitoring a user computing entity's status, the program being adapted to: evaluate one more parameters of operation of one more functional elements of the user entity; if an evaluated parameter has a value outside of a predetermined range which is indicative of normal user entity behaviour, operate the user entity to enable, in a predetermined manner, administrative access to the user entity to be gained by an administrative computing entity, thereby to permit the administrative entity to perform an administrative operation on the user entity.
Abstract:
A computing platform 20 provides multiple computing environments 24 each containing a guest operating system 25 provided by a virtual machine application 26. Optionally, each computing environment 24 is formed in a compartment 220 of a compartmented host operating system 22. A trusted device 213 verifies that the host operating system 22 and each guest operating system 25 operates in a secure and trusted manner by forming integrity metrics which can be interrogated by a user 10. Each computing environment is isolated and secure, and can be verified as trustworthy independent of any other computing environment.
Abstract:
A host computing platform 20 provides one or more computing environments 24 and includes a trusted device 213 arranged to form an integrity metric individual to each computing environment 24. The integrity metric is provided to a user 10 in response to an integrity challenge, signed for authentication using a signature key 213 held by the trusted device. In one embodiment the trusted device 213 selects a signature key unique to the computing environment 24, or in a second embodiment the trusted device forms the signed integrity metric including an identity label, in each case such that the user 10 can verify that the signed integrity metric corresponds to the expected computing environment 24.
Abstract:
A method of restricting data communication to a network, the network comprising a plurality of data processors and a network communication element arranged to receive data communications originating outside the network, the method comprising monitoring data communications originating from outside the network and received at the network communication element and identifying the intended recipient data processor within the network of the received data communications; and determining if the identified intended recipient data processor has a corresponding entry on a record of network data processors and if not, adding a corresponding entry to the first record of network data processors and adding a corresponding entry to a second record of network data processors.
Abstract:
A method of restricting transmission of data packets from a host entity in a network, comprising: transmitting outgoing packets to destination hosts whose identities are contained in a record stored in a working set of host identity records; over the course of repeated predetermined time intervals, restricting, to a predetermined number, destination hosts not identified in the working set and to which packets may be transmitted; deleting packets whose transmission has been restricted.
Abstract:
A method of restricting transmission of data packets from a host entity in a network, comprising: transmitting outgoing packets to destination hosts whose identities are contained in a record stored in a working set of host identity records; over the course of repeated predetermined time intervals, restricting, to a predetermined number, destination hosts not identified in the working to which packets may be transmitted; upon transmission of a packet to a host whose identity is not contained in a record in the working set, adding a record containing the host's identity to the working set and attributing a time to live to the record; deleting each record from the working set whose time to live has expired.
Abstract:
A process 23 runs directly on a host operating system 22, until the process 23 attempts an operation which can affect security of the host operating system 22 (such as loading a kernel module or using system privileges). A guest operating system 25 is then provided running as a virtual machine session within a compartment 24 of the host operating system 22 and running of the process 23 continues using the guest operating system. Operations of the process 23 which can affect security of the host operating system 22 are instead performed on the guest operating system 25, giving greater security. The guest operating system 25 is only invoked selectively, leading to greater overall efficiency.
Abstract:
A method of operating a computing entity in a network having a log mapping computing entity network addresses to vulnerabilities, the method comprising the steps of: using the entity's network address, searching the log to establish what vulnerabilities the entity has; and if the log indicates the entity has a vulnerability, sending data identifying a user of the entity to an administrator of the network.
Abstract:
A method of identifying a software vulnerability on a computer system is disclosed in which the computer system has software stored thereon and is connected to a management system over a computer network. The method comprises the steps of: applying an interrogation program to the software, the interrogation program being capable of exploiting a known software vulnerability if it is present in the software to which the interrogation program is applied; in the event that the software vulnerability is exploited by the interrogation program, operating the interrogation program to generate a set of management information from which can be derived the identification of the computer system; and sending the management information to the management system.