Server has a weak ephemeral

Author: n | 2025-04-24

Windows Thread, Server has a weak ephemeral Diffie-Hellman public key in Technical; !!!!! And then when I preswsed on details Code: Server has a weak ephemeral

Solve Server has a weak ephemeral Diffie-Hellman

Skip to content Navigation Menu GitHub Copilot Write better code with AI Security Find and fix vulnerabilities Actions Automate any workflow Codespaces Instant dev environments Issues Plan and track work Code Review Manage code changes Discussions Collaborate outside of code Code Search Find more, search less Explore Learning Pathways Events & Webinars Ebooks & Whitepapers Customer Stories Partners Executive Insights GitHub Sponsors Fund open source developers The ReadME Project GitHub community articles Enterprise platform AI-powered developer platform Pricing Provide feedback Saved searches Use saved searches to filter your results more quickly //voltron/issues_fragments/issue_layout;ref_cta:Sign up;ref_loc:header logged out"}"> Sign up Notifications You must be signed in to change notification settings Fork 10.4k Star 27k DescriptionHello,We have a TLS server based on OpenSSL, and when the key exchange with the clientgoes via Ephemeral Diffie Hellman (DHE) method, the server always generates a 1024 bit key,which is considered weak nowadays.Below is the screenshot illustrating it:Could you please advice if there is a way to configure OpenSSL so it would generatethe ephemeral key of the specific length? Greetings, I have been using Linksys RV042s and now Cisco RV042G routers for years. Recently firefox has not been able to access the router web set up utility citing;"An error occurred during a connection to 192.168.1.2. SSL received a weak ephemeral Diffie-Hellman key in Server Key Exchange handshake message. (Error code: ssl_error_weak_server_ephemeral_dh_key) The page you are trying to view cannot be shown because the authenticity of the received data could not be verified. Please contact the website owners to inform them of this problem."I guess I'm the "website owner" and I talk to myself too much as it is. [ Cisco tells me the only "help" is to buy a new unit, because there is no available help ]Internet explorer tells me there is a "Certificate error"; "Mismatched Address: The Security certificate presented by this website was issued for a different website's address."The difference being that IE, Chrome, and Edge will all let me go to the "website" [being the router] anyway.Any suggestions?Thanks

Fix: Server has a Weak ephemeral Diffie-Hellman

Calculate the numbers they would send to each other. If the prime number they settle on is too small or widely shared across many systems, attackers can exploit these patterns to break the key exchange.To strengthen Diffie-Hellman, it’s recommended to use a unique prime with a minimum size of 2,048 bits (think of the binary equivalent of a 617-digit decimal number), or to consider using Elliptic-Curve Diffie-Hellman Ephemeral.Elliptic-Curve Diffie-Hellman Ephemeral is a version of Diffie-Hellman that uses more secure “elliptic curve” numbers. Without going into detail about the properties of elliptic curves, we can say that they are more secure because the underlying mathematical problem is computationally harder to solve. This means that the same level of security can be achieved with a smaller key size (224-bit compared to 2,048-bit).Logjam Attacks: A Threat to Diffie-Hellman in Certain ScenariosAnother potential risk with Diffie-Hellman is its susceptibility to logjam attacks in specific cases, particularly when used with the transport layer security (TLS) protocol. TLS is a security protocol that encrypts data sent over the internet, ensuring privacy and security. When you see a “padlock” icon in your web browser, it often means the site is using TLS encryption.In a logjam attack, an attacker sits between the client and server (making this another kind of MitM attack). When the client attempts to establish a secure TLS connection using Diffie-Hellman, the attacker intercepts the communication and forces both parties to agree on using a weak 512-bit key.Once the connection has been downgraded to use a weak 512-bit key, the attacker can then use precomputed values or perform efficient computations to break the Diffie-Hellman key exchange and decrypt the communication. A 512-bit key is vulnerable because modern computers can solve the discrete logarithm problem for such small keys relatively quickly.Practical Applications of Diffie-Hellman Key ExchangeDiffie-Hellman key exchange is used across various security protocols that keep online communications safe. Here are some of the most common ways it’s used to protect your data:Editors' Note: ExpressVPN and this site are in the same ownership group.Evolution of Diffie-Hellman Key ExchangeSince its creation, the Diffie-Hellman key exchange has undergone several adaptations to keep up with modern security demands. Here are some ways it’s been improved and expanded over time:Incorporating perfect forward secrecy: As cybersecurity threats evolved, so did Diffie-Hellman. Variants like Ephemeral Diffie-Hellman (DHE) were developed to enhance security with perfect forward secrecy. This feature ensures that even if a private key is compromised in the future, past communications remain secure.The move to elliptic curves: To reduce computational demand, Elliptic-Curve Diffie-Hellman (ECDHE) was introduced. By using elliptic curves instead of traditional large prime numbers, ECDHE achieves similar security with shorter keys, making it faster and more efficient — ideal. Windows Thread, Server has a weak ephemeral Diffie-Hellman public key in Technical; !!!!! And then when I preswsed on details Code: Server has a weak ephemeral

[Solved] Server has a weak ephemeral Diffie-Hellman

Server has a weak ephemeral..." 09-07-2015, 09:19 AM Gets Weekends Off Thread Starter Joined APC: Jul 2008 Posts: 154 Thanks for the help. I installed the FF plugin. That way, I could easily undo it since that plugin defeats the security stuff that both FF and Chrome have created specifically to protect the end users against badly configured servers. I see in the ALPA Scheduling Committee brief that UAL knows something is wrong. Hopefully it gets fixed shortly so this workaround isn't needed.Thanks again! 09-07-2015, 12:40 PM Gets Weekends Off Joined APC: Jun 2010 Position: 747 Captain, retired Posts: 940 Quote: Originally Posted by steve0617 Thanks for the help. I installed the FF plugin. That way, I could easily undo it since that plugin defeats the security stuff that both FF and Chrome have created specifically to protect the end users against badly configured servers. I see in the ALPA Scheduling Committee brief that UAL knows something is wrong. Hopefully it gets fixed shortly so this workaround isn't needed.Thanks again! The best way to put the company on notice is to have the MEC demand an extension to the bidding window another 10 days! They'll fix it quick. 09-07-2015, 01:10 PM Prime Minister/Moderator Joined APC: Jan 2006 Position: Engines Turn Or People Swim Posts: 41,601 Quote: Originally Posted by Boulderian Here is the quick fix for Firefox that does not require installing anything.In address line in Firefox browser type: about:configIn the page that opens up, look for these two entries: security.ssl3.dhe_rsa_aes_128_sha security.ssl3.dhe_rsa_aes_256_shaToggle to FALSE for both Might consider resetting those to "true" when you're done on the UAL site. 09-07-2015, 03:59 PM Moderate Moderator Joined APC: Mar 2008 Position: Curator at Static Display Posts: 5,681 Rick:What are the repercussions if you don't? 09-08-2015, 08:47 AM Line Holder Joined APC: Feb 2013 Posts: 88 Quote: Originally Posted by UAL T38 Phlyer Rick:What are the repercussions if you don't? With it set to FALSE Firefox will still warn you that you are connecting to a dangerous or weak server (UAL) and ask if you wish to continue at your own risk. With it set to TRUE, it forbids you from connecting to such server - it makes the decision for you.The danger of having it set to FALSE is that you could potentially try connecting to a phishing server unintentionally (a server pretending to be your bank and try to steal you Problem: Chrome and Firefox recently updated and suddenly stopped allowing connections to your SMP3 Admin and possibly your applications and is giving you the error Server has a weak ephemeral Diffie-Hellman public keyThis is an attempt by the browsers to protect you from connecting to a Server that is using outdated cipher settings which could lead to a recently published SSL vulnerability "logjam".The ciphers being used by SMP3 SP08 and prior server versions are defaulting to obsolete choices. I believe this is being updated for the SMP3 SP09 release. However, in the meantime you can make a similar change to your server to update the ciphers using the following procedure.The quickest fix is to just remove the TLS_DHE_RSA_WITH_AES_128_CBC_SHA from the default cihpers list. This removes the one google is complaining about. You can also just update the ciphers as indicated below to add support for some of the newer cihphers. This won't hurt anything but I also don't know which ones are actually used or support by the browsers.Solution:Stop the SMP3 serverEdit the Server\confg_master\org.eclipse.gemini.web.tomcat\default-server.xml fileFind the ciphers line in each of the following Connector tags and replace the value with the ciphers below.Connector smpConnectorName="oneWaySSL"Connector smpConnectorName="AdminSSL"Connector smpConnectorName="mutualSSL"ciphers="TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384,TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,TLS_RSA_WITH_AES_128_CBC_SHA256,TLS_RSA_WITH_AES_128_CBC_SHA,TLS_RSA_WITH_AES_256_CBC_SHA256,TLS_RSA_WITH_AES_256_CBC_SHA"Save and restart the SMP3 server. Now connections from Chrome and Firefox should no longer give that error.The key is to remove the TLS_DHE_* ciphers. This list contains probably more options that you will need but I leave it to you to determine which ones you want to support.For Agentry clients be sure to test each device you will be using BEFORE making this change in production. If your device does not support the newer ciphers it will probably fail to connect and you may need to either update your device or re-implement the obsolete cipher.

Server has a Weak Ephemeral Diffie-Hellman Public Key

Client, which created that particular znode, is disconnected. By default, all znodes are persistent unless otherwise specified.Ephemeral znode − Ephemeral znodes are active until the client is alive. When a client gets disconnected from the ZooKeeper ensemble, then the ephemeral znodes get deleted automatically. For this reason, only ephemeral znodes are not allowed to have a children further. If an ephemeral znode is deleted, then the next suitable node will fill its position. Ephemeral znodes play an important role in Leader election.Sequential znode − Sequential znodes can be either persistent or ephemeral. When a new znode is created as a sequential znode, then ZooKeeper sets the path of the znode by attaching a 10 digit sequence number to the original name. For example, if a znode with path /myapp is created as a sequential znode, ZooKeeper will change the path to /myapp0000000001 and set the next sequence number as 0000000002. If two sequential znodes are created concurrently, then ZooKeeper never uses the same number for each znode. Sequential znodes play an important role in Locking and Synchronization.SessionsSessions are very important for the operation of ZooKeeper. Requests in a session are executed in FIFO order. Once a client connects to a server, the session will be established and a session id is assigned to the client.The client sends heartbeats at a particular time interval to keep the session valid. If the ZooKeeper ensemble does not receive heartbeats from a client for more than the period (session timeout) specified at the starting of the service, it decides that the client died.Session timeouts are usually represented in milliseconds. When a session ends for any reason, the ephemeral znodes created during that session also get deleted.WatchesWatches are a simple mechanism for the client to get notifications about the changes in the ZooKeeper ensemble. Clients can set watches while reading a particular znode. Watches send a notification to the registered client for any of the znode (on which client registers) changes.Znode changes are modification of data associated with the znode or changes in the znode’s children. Watches are triggered only once. If a client wants a notification again, it must be done through another read operation. When a connection session is expired, the client will be disconnected from the server and the associated watches are also removed.Zookeeper - WorkflowOnce a ZooKeeper ensemble starts, it will wait for the clients to connect. Clients will connect to

google chrome - Server has a weak ephemeral Diffie-Hellman

Addon. --enable-workload-identity (PREVIEW) Enable Workload Identity addon for cluster. --ephemeral-disk-nvme-perf-tier Set ephemeral disk volume type for azure container storage. Accepted values: Basic, Premium, Standard--ephemeral-disk-volume-type Set ephemeral disk volume type for azure container storage. Accepted values: EphemeralVolumeOnly, PersistentVolumeWithAnnotation Specify DNS server for Windows gmsa on cluster. You do not need to set this if you have set DNS server in the VNET used by the cluster.You must set or not set --gmsa-dns-server and --gmsa-root-domain-name at the same time when setting --enable-windows-gmsa. Specify root domain name for Windows gmsa on cluster. You do not need to set this if you have set DNS server in the VNET used by the cluster.You must set or not set --gmsa-dns-server and --gmsa-root-domain-name at the same time when setting --enable-windows-gmsa. Resource ID of the Azure Managed Grafana Workspace. HTTP Proxy configuration for this cluster. The value provided will be compared to the ETag of the managed cluster, if it matches the operation will proceed. If it does not match, the request will be rejected to prevent accidental overwrites. This must not be specified when creating a new cluster. Set to '*' to allow a new cluster to be created, but to prevent updating an existing cluster. Other values will be ignored. --image-cleaner-interval-hours ImageCleaner scanning interval. A comma separated list of IP versions to use for cluster networking. Each IP version should be in the format IPvN. For example, IPv4. Choose from "KubernetesOfficial" or "AKSLongTermSupport", with "AKSLongTermSupport" you get 1 extra year of CVE patchs. Accepted values: AKSLongTermSupport, KubernetesOfficial--ksm-metric-annotations-allow-list Comma-separated list of additional Kubernetes label keys that will be used in the resource' labels metric. By default the metric contains only name and namespace labels. To include additional labels provide a list of resource names in their plural form and Kubernetes label keys you would like to allow for them (e.g.'=namespaces=[k8s-label-1,k8s-label-n,...],pods=[app],...)'. A single '' can be provided per resource instead to allow any labels, but that has severe performance implications (e.g. '=pods=[]'). --ksm-metric-labels-allow-list Comma-separated list of additional Kubernetes label keys that will be used in the resource' labels metric. By default the metric contains only name and namespace labels. To include additional labels provide a list of resource names in their plural form and Kubernetes label keys you would like to allow for them (e.g. '=namespaces=[k8s-label-1,k8s-label-n,...],pods=[app],...)'. A single '' can be provided per resource instead to allow any labels, but that has severe performance implications (e.g. '=pods=[]'). Kube-proxy configuration for this cluster. --load-balancer-backend-pool-type Load balancer backend pool type. Load balancer backend pool type, supported values are nodeIP and nodeIPConfiguration.--load-balancer-idle-timeout Load balancer idle timeout in minutes. Desired idle timeout for load balancer outbound flows, default is 30 minutes. Please specify a value in the range of [4, 100].--load-balancer-managed-outbound-ip-count. Windows Thread, Server has a weak ephemeral Diffie-Hellman public key in Technical; !!!!! And then when I preswsed on details Code: Server has a weak ephemeral

Server has a weak ephemeral diffie-hellman public key

Cluster. Enable syslog data collection for Monitoring addon. Accepted values: false, true Enable UltraSSD on agent node pool. Enable vertical pod autoscaler for cluster. Enable vTPM on all node pools in the cluster. Must use VMSS agent pool type. --enable-windows-recording-rules Enable Windows Recording Rules when enabling the Azure Monitor Metrics addon. --enable-workload-identity (PREVIEW) Enable workload identity addon. --ephemeral-disk-nvme-perf-tier Set ephemeral disk volume type for azure container storage. Accepted values: Basic, Premium, Standard--ephemeral-disk-volume-type Set ephemeral disk volume type for azure container storage. Accepted values: EphemeralVolumeOnly, PersistentVolumeWithAnnotation Prefix for FQDN that is created for private cluster with custom private dns zone scenario. Generate SSH public and private key files if missing. Specify DNS server for Windows gmsa for this cluster. You do not need to set this if you have set DNS server in the VNET used by the cluster.You must set or not set --gmsa-dns-server and --gmsa-root-domain-name at the same time when setting --enable-windows-gmsa. Specify root domain name for Windows gmsa for this cluster. You do not need to set this if you have set DNS server in the VNET used by the cluster.You must set or not set --gmsa-dns-server and --gmsa-root-domain-name at the same time when setting --enable-windows-gmsa. GPU instance profile to partition multi-gpu Nvidia GPUs. Accepted values: MIG1g, MIG2g, MIG3g, MIG4g, MIG7g Resource ID of the Azure Managed Grafana Workspace. (PREVIEW) The fully qualified dedicated host group id used to provision agent node pool. Http Proxy configuration for this cluster. The value provided will be compared to the ETag of the managed cluster, if it matches the operation will proceed. If it does not match, the request will be rejected to prevent accidental overwrites. This must not be specified when creating a new cluster. Set to '*' to allow a new cluster to be created, but to prevent updating an existing cluster. Other values will be ignored. --image-cleaner-interval-hours ImageCleaner scanning interval. A comma separated list of IP versions to use for cluster networking. Each IP version should be in the format IPvN. For example, IPv4. Choose from "KubernetesOfficial" or "AKSLongTermSupport", with "AKSLongTermSupport" you get 1 extra year of CVE patchs. Accepted values: AKSLongTermSupport, KubernetesOfficial--ksm-metric-annotations-allow-list Comma-separated list of additional Kubernetes label keys that will be used in the resource' labels metric. By default the metric contains only name and namespace labels. To include additional labels provide a list of resource names in their plural form and Kubernetes label keys you would like to allow for them (e.g.'=namespaces=[k8s-label-1,k8s-label-n,...],pods=[app],...)'. A single '' can be provided per resource instead to allow any labels, but that has severe performance implications (e.g. '=pods=[]'). --ksm-metric-labels-allow-list Comma-separated list of additional Kubernetes label keys that will be used in the resource' labels metric. By default the metric contains