The Patch Management consists of the following components:
Fig: Patch Management Architecture
Patch download, assessment for patch authenticity and testing for functional correctness is also carried out at this site. The final analysis and data are correlated to obtain a consolidated vulnerability database which serves as a baseline for vulnerability assessment in the enterprise. The modified vulnerability database is then published to the Central Patch Repository for further use. The whole process of information gathering, patch analysis and publishing the latest vulnerability database occurs periodically.
The Central Patch Repository is a portal in the Zoho Corp. site, which hosts the latest vulnerability database that has been published after a thorough analysis. This database is exposed for download by the Patch Manager Plus server situated in the customer site, and provides information required for patch scanning and installation. The data provided is encrypted and transferred over HTTPS.
The Patch Manager Plus server is located at the enterprise (customer site) and subscribes to the Central Patch repository, to periodically download the vulnerability database. It scans the systems in the enterprise network, checks for missing and available patches against the comprehensive vulnerability database, downloads and deploys missing patches and service packs, generates reports to effectively manage the patch management process in your enterprise.
Patch Management is a two-stage process:
The systems in the network are periodically to assess the patch needs. Using a comprehensive database consolidated from Microsoft's and other bulletins, the scanning mechanism checks for the existence and state of the patches by performing file version checks, registry checks and checksums. The vulnerability database is periodically updated with the latest information on patches, from the Central Patch Repository. The scanning logic automatically determines which updates are needed on each client system, taking into account the operating system, application, and update dependencies.
On successful completion of an assessment, the results of each assessment are returned and stored in the server database. The scan results can be viewed from the web-console.
On selecting the patches to be deployed, the server downloads the patches from the vendor website and verifies its integrity using Checksum. Following this, the agent downloads the patches from the server. The URL of the patches downloaded from the server will be validated with the checksum. Patch binaries will be validated with checksum during the download and each time installation is initiated.