Verification logic for multiple DNSSEC RRsets can trigger server failure. CVE:  CVE-2007-0494 Posting date:  30 Jan 2007 Program Impacted:  BIND Versions affected:  9.0, 9.1, 9.2, 9.3.0-9.3.3, pre-release versions of 9.4.0, Alpha release of 9.5.0 Severity:  Low Exploitable:  Remotely Description: When validating responses to type * (ANY) queries that return multiple RRsets in the answer section it is possible to trigger assertions checks. To be vulnerable you need to have enabled DNSSEC validation in named.conf by specifying trusted-keys. Workarounds: Disable or restrict recursion (to limit exposure). Disable DNSSEC validation (remove all trusted-keys from named.conf). Active exploits: None known at this time. Solution:   Upgrade to BIND 9.2.8, BIND 9.3.4 or a released version of BIND 9.4 or 9.5 Note:   It is recommended that anyone using DNSSEC upgrade to

With inline-signing , its working process and the results are kept separate from the original data on which they are based, so there is no overlap with the files used by update-policy . To summarise: If only dynamic update is enabled, dnssec-policy will work in its journal and store signatures alongside the records that have been signed in the original zone file. With inline-signing enabled, work is done in dedicated journals and signatures are stored alongside the records that have been signed in new ...signed files. It may be important to be aware of this difference in behaviour if inline-signing is enabled in a configuration where zones (with dynamic updates enabled) were already being signed by dnssec-policy . Before the change, the original zone files will contain regular data (managed dynamically through nsupdate plus DNSSEC data. If inline-signing is now enabled, which is the default

you have used -g as we did. root:/etc/namedb# named -g & [1] 22438 11-Jun-2012 16:28:25.844 starting BIND 9.9.1-P1 -g 11-Jun-2012 16:28:25.844 built with '--prefix=/usr/local/bind-9.9.1-P1' 11-Jun-2012 16:28:25.844 ---------------------------------------------------- 11-Jun-2012 16:28:25.844 BIND 9 is maintained by Internet Systems Consortium, 11-Jun-2012 16:28:25.844 Inc. (ISC), a non-profit 501(c)(3) public-benefit 11-Jun-2012 16:28:25.844 corporation. Support and training for BIND 9 are 11-Jun-2012 16:28:25.845 available at https://www.isc.org/support 11-Jun-2012 16:28:25.845 ---------------------------------------------------- 11-Jun-2012 16:28:25.845 using 1 UDP listener per interface 11-Jun-2012 16:28:25.845 using up to 4096 sockets 11-Jun-2012 16:28

Like many basic Internet protocols, DHCP was not originally designed with a robust security model, but was designed for simplicity of implementation and ease of deployment. Care should be taken in networks that use DHCP to avoid common security pitfalls. Problem 1: Rogue DHCP Servers A substantial part of the appeal of DHCP is that clients joining a network require no a priori knowledge of the network. They advertise (via a DHCPDISCOVER packet) to find a DHCP server and, assuming all goes well, receive their configuration information from that server and join the network as fully functioning clients. While this is very desirable behavior as far as ease of deployment is concerned, from a security standpoint it is problematic that client machines, having no pre-existing knowledge of the network, cannot distinguish between a response from a server which is authorized by the network's administrator and another machine which

BIND 9 Operating System Support When a new branch of BIND 9 is released, ISC normally tests it to ensure compatibility with the current versions of major operating systems (OSes) at that time. In general, that branch of BIND 9 will support those major operating systems until either that version of BIND 9 or that version of the OS reaches end-of-life (EOL) status. The table below lists the operating systems supported by the current versions of BIND 9. Legend: 💚 Supported 🔵 Best effort 🟧 Community-maintained ❌ Unsupported or does not work More information on the meaning of each of these legend symbols can be found later in this article. OS / Version BIND 9.18 (EOL: Q2 2026) BIND 9.20 (EOL: Q2 2028) OS EOL Date Alpine Linux (latest) 💚 💚 CentOS 8 💚 💚 Dec 2021 CentOS 8 Stream 🟧 🟧 May 2024 CentOS 9

Knowledge of git and of source code management is assumed... If you are unfamiliar with source code management, and in particular with the use of git, we recommend instead that you use the web-based interface to view the BIND source code trees available here:  https://gitlab.isc.org/isc-projects/bind9 . To check out BIND 9 source, type: git clone https://gitlab.isc.org/isc-projects/bind9.git This will create a local directory called bind9 which will contain all branches of the source code. Branch names are of the form v9_X , where X represents the second number in the BIND 9 version number. So for example, to check out the BIND 9.11 branch go into the bind9 directory and run: git checkout v9_11 Older Extended Release Version branches are named slightly differently, but following the same pattern. To view the latest development version of BIND

the PARTNER-DOWN state. You can put the server into the PARTNER-DOWN state either by using the omshell (1) command or by stopping the server, editing the last failover state declaration in the lease file, and restarting the server. If you use this last method, change the "my state" line to: failover peer name state { my state partner-down;. peer state state at date ; } It is only required to change "my state" as shown above. When the other server comes back online, it should automatically detect that it has been offline and request a complete update from the server that was running in the PARTNER-DOWN state, and then both servers will resume processing together. It is possible to get into a dangerous situation: if you put one server into the PARTNER-DOWN state, and then *that* server goes down, and the other server comes back up, the other

CVE: CVE-2020-8623 Document version: 2.0 Posting date: 20 August 2020 Program impacted: BIND Versions affected: BIND 9.10.0 -> 9.11.21, 9.12.0 -> 9.16.5, 9.17.0 -> 9.17.3, also affects 9.10.5-S1 -> 9.11.21-S1 of the BIND 9 Supported Preview Edition Severity: Medium Exploitable: Remotely Description: If BIND is built with "--enable-native-pkcs11" then a specially crafted query for a zone signed with RSA can trigger an assertion failure. Impact: An attacker that can reach a vulnerable system with a specially crafted query packet can trigger a crash. To be vulnerable, the system must: * be running BIND that was built with "--enable-native-pkcs11" * be signing one or more zones with an RSA key * be able to receive queries from a possible attacker CVSS Score: 6.7 CVSS Vector: CVSS:3.1/AV:N/AC:L

Do I need a journal on secondary servers? The journal reduces the cost of rewriting complete zone files; basically, the IXFR gets appended to the journal when it occurs. For BIND 9.11 and earlier, we recommend setting the journal size to some modest non-zero size (64KB to 1MB). If you have any large frequently-updated zones, they might benefit from a bigger journal to reduce zone file rewrites. There's a minimum journal size (approximately 1KB), so even if you set max-journal-size to 0 (or any other tiny value) it is rounded up to the minimum. Starting in BIND 9.12, max-journal-size is automatically set based on the zone size, so you should be able to remove any max-journal-size settings from your configuration.

Posting date : 14 March 2018 Program impacted :  BIND Versions affected : 9.0.x -> 9.8.x, 9.9.0->9.9.11-P1, 9.10.0->9.10.6-P1, 9.11.0->9.11.2-P1, 9.12.0->9.12.0-P1 Description "update-policy local;", which is a permission cluster provided as a shortcut for operators who use Dynamic DNS (DDNS), was misleadingly named in that its original implementation did not actually enforce a requirement that the updates it allows originate locally. A full description of "update-policy local;" is included in Section 6.2 of the BIND Administrator Reference Manual, but to briefly summarize: When "update-policy local;" is set for a zone in named.conf , named will create and use an automatically generated session key (named "local-ddns" by default and stored in local storage on the server) and will permit updates to the zone

Buffer overflow in BIND 8.2 via NXT records. CVE:  CVE-1999-0833 Posting date:  08 Nov 1999 Program Impacted:  [BIND](https://www.isc.org/bind) Versions affected:  8.2, 8.2.1 Severity:  Critical Exploitable:  Remotely Description:  A bug in the processing of NXT records can theoretically allow an attacker to gain access to the system running the DNS server with the same privileges that the BIND process has. Workarounds:  None. Active exploits:  Scripts are available to implement this attack. Solution:  Upgrade to 8.2.2 or newer © 2001-2018 Internet Systems Consortium For assistance with problems and questions for which you have not been able to find an answer in our Knowledge Base, we recommend searching our community mailing list archives and/or posting your question there (you will need to register there first for your posts to be accepted). The bind-users and the dhcp-users

What is classification anyway? Client classification helps with differentiating between clients. It can be used to change the behavior of many parts of the DHCP message processing: subnet selection pool selection lease limiting rate limiting DDNS tuning dropping queries definition of DHCPv4 private (codes 224-254) and code 43 options assignment of different options for DHCPv4 cable modems, the setting of specific options for use with the TFTP server address and the boot file field What are template classes? Template classes are a special type of classes that can spawn an indefinite number of regular classes using a single class definition. That makes it an efficient way of configuring multiple classes. The spawned classes need to be mentioned in other parts of the configuration in order to make effective use of them. Template classes don't make it easier for the spawned classes to be referenced. That part of the

appends the zone $ORIGIN. Increment the serial number of the zone, to ensure a flawless zone transfer to your slave servers after reloading the zone on your master. If you had frozen the zone in step 1, thaw it now by issuing this command: rndc thaw Reload the zone file by issuing this command: rndc reload Again, after reloading the zone, the TXT record should become available. Dynamically Updating your DNS Zone to add the DKIM Public Key In scenarios where you intend to maintain a large number of DKIM keys published or if your operation uses Dynamic Updates for your DNS zone maintenance, it is possible to use this mechanism to manage your DKIM public keys with ease. This scheme requires fewer steps and can be easily integrated in automated provisioning schemes. First, you must ensure that you'll be able to add the DKIM public keys. You'll

network failure that breaks the connection will not result in the servers being out of communication for a long time, but large enough that the server isn’t constantly making and breaking connections. This parameter must be specified. The max-unacked-updates statement max-unacked-updates count ; The max-unacked-updates statement tells the remote DHCP server how many BNDUPD messages it can send before it receives a BNDACK from the local system. We don’t have enough operational experience to say what a good value for this is, but 10 seems to work. This parameter must be specified. The mclt statement mclt seconds ; The mclt statement defines the Maximum Client Lead Time. It must be specified on the primary, and may not be specified on the secondary. This is the length of time for which a lease may be renewed by either failover peer without contacting the other

+ + + + + + + + + + + + + + + + + 9.16.26 + + + + + + + + + + + + + + + + + + + + 9.16.25 + + + + + + + + + + + + + + + + + + + + 9.16.24 + + + + + + + + + + + + + + + + + + + + 9.16.23 + + + + + + + + + + + + + + + + + + + + 9.16.22 + + + + + + + + + + + + + + + + + + + + 9.16.21 + + + + + + + + + + + + + + + + + + + + + 9.16.20 + + + + + + + + + + + + + + + + + + + + + 9.16.19 + + + + + + + + + + + + + + + + + + + + + + 9.16.18 + + + + + + + + + + + + + + + + + + + + + 9.16.17 + + + + + + + + + + + + + + + + + + + + + 9.16.16 + + + + + + + + + + + + + + + + + + + + + 9.16.15 + + + + + + + + + + + + + + + + + + + + + 9.16.14 + + + + + + + + + + + + + + + + + + + + + 9.16.13 + + + + + + + + + + + + + + + + + + + + + + + 9.16.12 + + + + + + + + + + + + + + + + + + + + + + 9.16.11 + + + + + + + + + + + + + + + + + + + + + 9.16.10 + + + + + + + + + + + + + + + + + + + + 9.16.9 + + + + + + + + + + + + + + + + + + + + 9.16.8 + + + + + + + + + + + + + + + + + + + + 9.16.7 + + + + + + + + + + + + + + + + + + + + 9.16.6 + + + + + + + + + + + + + + + + + + + + 9.16.5 + + + + + + + + + + + + + + + + + + + + + + + + + 9.16.4 + + + + + + + + + + + + + + + + + + + + + + + + + 9.16.3 + + + + + + + + + + + + + + + + + + + + + + + + + + + 9.16.2 + + + + + + + + + + + + + + + + + + + + + + + + + + + + + 9.16.1 + + + + + + + + + + + + + + + + + + + + + + + + + + + + + 9.16.0 + + + + + + + + + + + + + + + + + + + + + + + + + + + + + BIND 9.16 Supported Preview edition 9.16 was the the prior Supported Preview edition of BIND before 9.18. This branch reached end of maintenance in April 2024. If you would like more information on our product support, or about our BIND Subscription edition, please visit https://www.isc.org/bind . ver/CVE 119 120 121 122 123 124 125 126 127 128 129 130 131 132

to be placed in the netadmins group as well. This may change in a future release of Stork. User Access Optionally, you can limit Stork logins to a particular LDAP group. STORK_SERVER_HOOK_LDAP_GROUP_ALLOW If defined, Stork login will be allowed only for members of the specified LDAP group. You must provide the Common Name of the group (without CN= prefix). Use this if not all LDAP users should be permitted login to Stork. For example, if you have an LDAP group netadmins , you might specify that here, and then only your network admins will be able to login to Stork. This is independent of the group mapping feature ( MAP_GROUPS ). You can restrict Stork login without mapping Stork roles. You can map Stork roles without restricting Stork login. However, it often makes the most sense to use both features together. Group Mapping Optionally, you can

Title:  Memory Leaks Found In ISC DHCP Summary: Two memory leaks have been found and fixed in ISC DHCP. Both are reproducible when running in DHCPv6 mode (with the -6 command-line argument.) The first leak is confirmed to only affect servers operating in DHCPv6 mode, but based on initial code analysis the second may theoretically affect DHCPv4 servers (though this has not been demonstrated.) CVE:   CVE-2012-3954 Document Version:  2.1 Posting date:  24 July 2012 Program Impacted:   ISC DHCP 4 Versions affected:  4.1.x, 4.2.x Severity:  Medium Exploitable:  From networks permitted to send requests to the DHCP server. Description: ISC has discovered and fixed two memory leaks in the DHCP code. One of the leaks only affects servers running in DHCPv6 mode. The other is known to affect a server running in DHCPv6 mode but could potentially occur on servers running in DHCPv4 mode

'secret' value must not be base64 encoded, which is different from how the value appears in the dhcpd.conf file. dhcpctl_new_object() creates a local handle for an object on the server. The “object_type” parameter is the ascii name of the type of object being accessed. e.g. "lease". This function only sets up local data struc‐ tures, it does not queue any messages to be sent to the remote side, dhcpctl_open_object() does that. dhcpctl_open_object() builds and queues the request to the remote side. This function is used with handle created via dhcpctl_new_object() . The flags argument is a bit mask with the following values available for set‐ ting: DHCPCTL_CREATE if the object does not exist then the remote will create it DHCPCTL_UPDATE update the object on the remote side using the attributes already set in the handle. DHCPCTL_EXCL

MySQL supports multiple database storage engines . InnoDB is the default engine and the one that Kea is designed to work with. NDB MySQL can support clustering with either InnoDB or NDB. The two options do have different characteristics , including different requirements for creating tables. Kea's dhcpdb_create.mysql schema creation script sets up the tables for the InnoDB engine. This script is not entirely compatible with NDB, due to restrictions on foreign keys. Thus the Kea configuration backend, host reservations and forensic logging tables are unusable in an NDB implementation. Read more about this in the "Restrictions on foreign keys" bullet point in the MySQL documentation . If you are using the MySQL database for lease storage, you can make the NDB cluster work. To do this modify the engine in dhcpdb_create.mysql , and force past all the error messages. This is considered experimental and is not a configuration

题目： 特意构造的DNS数据可导致服务器被锁定 摘要： 特意构造的资源记录数据 一旦被引入域名服务器，可导致该服务器被锁定。 CVE : CVE-2012-5166 文档版本 ：2.0 发布日期 ：2012年10月9日 受影响软件 ：BIND 软件版本 ：9.2.x -> 9.6.x, 9.4-ESV->9.4-ESV-R5-P1, 9.6-ESV->9.6-ESV-R7-P3, 9.7.0->9.7.6-P3, 9.8.0->9.8.3-P3, 9.9.0->9.9.1-P3 严重程度 ：高危 可利用方式 ：远程 描述 ： 如果特定组配的RDATA被载