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Tim Critchley
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Profile of Tim Critchley

CEO at Semafone
Member Since: 8/20/2018
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News & Commentary Posts: 1
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Tim Critchley has been the CEO of Semafone since 2009 and has led the company from a UK startup to an international business that spans five continents. He has helped secure Series A and Series B rounds of funding from various investor groups, including the BGF and Octopus. Under his leadership, the company has secured global partnerships and won clients that span a range of industry sectors, including major brands such as AXA, BT, Capita, Harley Davidson, Next, Rogers Communications, Santander, and Sky. Prior to joining Semafone, Tim was COO at KnowledgePool Group, the UK's leading provider of managed learning services, where he helped complete a successful turnaround in three years. Tim graduated from the London School of Economics and has an MBA from Manchester Business School.
Articles by Tim Critchley
Government Shutdown Brings Certificate Lapse Woes
Curtis Franklin Jr., Senior Editor at Dark Reading,  1/11/2019
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From DHS/US-CERT's National Vulnerability Database
CVE-2018-5740
PUBLISHED: 2019-01-16
"deny-answer-aliases" is a little-used feature intended to help recursive server operators protect end users against DNS rebinding attacks, a potential method of circumventing the security model used by client browsers. However, a defect in this feature makes it easy, when the feature is i...
CVE-2018-5741
PUBLISHED: 2019-01-16
To provide fine-grained controls over the ability to use Dynamic DNS (DDNS) to update records in a zone, BIND 9 provides a feature called update-policy. Various rules can be configured to limit the types of updates that can be performed by a client, depending on the key used when sending the update ...
CVE-2016-9778
PUBLISHED: 2019-01-16
An error in handling certain queries can cause an assertion failure when a server is using the nxdomain-redirect feature to cover a zone for which it is also providing authoritative service. A vulnerable server could be intentionally stopped by an attacker if it was using a configuration that met th...
CVE-2017-3135
PUBLISHED: 2019-01-16
Under some conditions when using both DNS64 and RPZ to rewrite query responses, query processing can resume in an inconsistent state leading to either an INSIST assertion failure or an attempt to read through a NULL pointer. Affects BIND 9.8.8, 9.9.3-S1 -> 9.9.9-S7, 9.9.3 -> 9.9.9-P5, 9.9.10b1...
CVE-2017-3136
PUBLISHED: 2019-01-16
A query with a specific set of characteristics could cause a server using DNS64 to encounter an assertion failure and terminate. An attacker could deliberately construct a query, enabling denial-of-service against a server if it was configured to use the DNS64 feature and other preconditions were me...