Change #4777 (introduced in October 2017) introduced an unforeseen issue in releases which were issued after that date, affecting which clients are permitted to make recursive queries to a BIND nameserver. The intended (and documented) behavior is that if an operator has not specified a value for the "allow-recursion" setting, it SHOULD default to one of the following: none, if "recursion no;" is set in named.conf; a value inherited from the "allow-query-cache" or "allow-query" settings IF "recursion yes;" (the default for that setting) AND match lists are explicitly set for "allow-query-cache" or "allow-query" (see the BIND9 Administrative Reference Manual section 6.2 for more details); or the intended default of "allow-recursion {localhost; localnets;};" if "recursion yes;" is in effect and no values are explicitly set for "allow-query-cache" or "allow-query". However, because of the regression introduced by change #4777, it is possible when "recursion yes;" is in effect and no match list values are provided for "allow-query-cache" or "allow-query" for the setting of "allow-recursion" to inherit a setting of all hosts from the "allow-query" setting default, improperly permitting recursion to all clients. Affects BIND 9.9.12, 9.10.7, 9.11.3, 9.12.0->9.12.1-P2, the development release 9.13.0, and also releases 9.9.12-S1, 9.10.7-S1, 9.11.3-S1, and 9.11.3-S2 from BIND 9 Supported Preview Edition.
| Software | From | Fixed in |
|---|---|---|
| isc / bind | 9.12.0 | 9.12.0.x |
| isc / bind | 9.12.1 | 9.12.1.x |
| isc / bind | 9.12.0-b1 | 9.12.0-b1.x |
| isc / bind | 9.12.0-b2 | 9.12.0-b2.x |
| isc / bind | 9.12.0-rc1 | 9.12.0-rc1.x |
| isc / bind | 9.11.3-s2 | 9.11.3-s2.x |
| isc / bind | 9.11.3-s1 | 9.11.3-s1.x |
| isc / bind | 9.10.7-s1 | 9.10.7-s1.x |
| isc / bind | 9.9.12-s1 | 9.9.12-s1.x |
| isc / bind | 9.10.7 | 9.10.7.x |
| isc / bind | 9.11.3 | 9.11.3.x |
| isc / bind | 9.12.0-a1 | 9.12.0-a1.x |
| isc / bind | 9.12.0-rc3 | 9.12.0-rc3.x |
| isc / bind | 9.12.1-p1 | 9.12.1-p1.x |
| isc / bind | 9.12.1-p2 | 9.12.1-p2.x |
| isc / bind | 9.13.0 | 9.13.0.x |
| isc / bind | 9.9.12 | 9.9.12.x |
| canonical / ubuntu_linux | 18.04 | 18.04.x |
A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.
CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.
A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.
Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.
Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.
SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.