How Cloudflare helped mitigate the Atlassian Confluence OGNL vulnerability before the PoC was released
On August 25, 2021, Atlassian released a security advisory for their Confluence Server and Data Center. The advisory highlighted an Object-Graph Navigation Language (OGNL) injection that would result in an unauthenticated attacker being able to execute arbitrary code.
A full proof of concept (PoC) of the attack was made available by a security researcher on August 31, 2021. Cloudflare immediately reviewed the PoC and prepared a mitigation rule via an emergency release. The rule, once tested, was deployed on September 1, 2021, at 15:32 UTC with a default action of BLOCK and the following IDs:
100400(for our legacy WAF)e8c550810618437c953cf3a969e0b97a(for our new WAF)
All customers using the Cloudflare WAF to protect their self-hosted Confluence applications have automatically been protected since the new rule was deployed last week. Additionally, the Cloudflare WAF started blocking a high number of potentially malicious requests to Confluence applications even before the rule was deployed.
And customers who had deployed Cloudflare Access in front of their Confluence applications were already protected even before the emergency release. Access checks every request made to a protected hostname for a JSON Web Token (JWT) containing a user’s identity. Any unauthenticated users attempting this exploit Continue reading
Open-Source DMVPN Alternatives
When I started collecting topics for the September 2021 ipSpace.net Design Clinic one of the subscribers sent me an interesting challenge: are there any open-source alternatives to Cisco’s DMVPN?
I had no idea and posted the question on Twitter, resulting in numerous responses pointing to a half-dozen alternatives. Thanks a million to @MarcelWiget, @FlorianHeigl1, @PacketGeekNet, @DubbelDelta, @Tomm3h, @Joy, @RoganDawes, @Yassers_za, @MeNotYouSharp, @Arko95, @DavidThurm, Brian Faulkner, and several others who chimed in with additional information.
Here’s what I learned:
Open-Source DMVPN Alternatives
When I started collecting topics for the September 2021 ipSpace.net Design Clinic one of the subscribers sent me an interesting challenge: are there any open-source alternatives to Cisco’s DMVPN?
I had no idea and posted the question on Twitter, resulting in numerous responses pointing to a half-dozen alternatives. Thanks a million to @MarcelWiget, @FlorianHeigl1, @PacketGeekNet, @DubbelDelta, @Tomm3h, @Joy, @RoganDawes, @Yassers_za, @MeNotYouSharp, @Arko95, @DavidThurm, Brian Faulkner, and several others who chimed in with additional information.
Here’s what I learned:
What’s new in Calico Enterprise 3.9: Live troubleshooting and resource-efficient application-level observability
We are excited to announce Calico Enterprise 3.9, which provides faster and simpler live troubleshooting using Dynamic Packet Capture for organizations while meeting regulatory and compliance requirements to access the underlying data. The release makes application-level observability resource-efficient, less security intrusive, and easier to manage. It also includes pod-to-pod encryption with Microsoft AKS and AWS EKS with AWS CNI.
Live troubleshooting
Enterprises that want to carry out live troubleshooting in their production environments face the following challenges when doing packet capture at an organizational scale:
- Difficult to limit access to packet capture by organizational roles
- Takes hours to days to setting up packet capture instead of making part of the code
- Extremely difficult to capture the right amount of data to lessen storage and compute cost
- Spend days and weeks to correlate the data collected from different Kubernetes components such as namespaces, workloads, pods, microservices
With Dynamic Packet Capture, organizations can enable DevOps, SREs, service owners to collect the data that they need when they need it. They can filter the data based on protocol and port to fine-tune their capture for faster debugging and subsequent analysis for shorter time-to-resolution. With just-in-time data collection and built-in smart correlation, Continue reading
Tier 1 Carriers Performance Report: August, 2021
The post Tier 1 Carriers Performance Report: August, 2021 appeared first on Noction.
Network Break 349: T-Mobile Fails To Protect Millions Of Customer Records; Ciena Buys Vyatta Router
Today's Network Break podcast opines on why Ciena acquired the Vyatta router from AT&T (and why AT&T wanted to sell), how T-Mobile failed current and former customers via a breach that exposed sensitive details on millions of people, financial results from HPE and Dell Technologies, and more.
The post Network Break 349: T-Mobile Fails To Protect Millions Of Customer Records; Ciena Buys Vyatta Router appeared first on Packet Pushers.
Network Break 349: T-Mobile Fails To Protect Millions Of Customer Records; Ciena Buys Vyatta Router
Today's Network Break podcast opines on why Ciena acquired the Vyatta router from AT&T (and why AT&T wanted to sell), how T-Mobile failed current and former customers via a breach that exposed sensitive details on millions of people, financial results from HPE and Dell Technologies, and more.Container Security Best Practices
A specialist responsible for container security should have an understanding of the infrastructure and proficiency in Linux and Kubernetes.What’s new with Cloudflare for SaaS?
This past April, we announced the Cloudflare for SaaS Beta which makes our SSL for SaaS product available to everyone. This allows any customer — from first-time developers to large enterprises — to use Cloudflare for SaaS to extend our full product suite to their own customers. SSL for SaaS is the subset of Cloudflare for SaaS features that focus on a customer’s Public Key Infrastructure (PKI) needs.
Today, we’re excited to announce all the customizations that our team has been working on for our Enterprise customers — for both Cloudflare for SaaS and SSL for SaaS.
Let’s start with the basics — the common SaaS setup
If you’re running a SaaS company, your solution might exist as a subdomain of your SaaS website, e.g. template.<mysaas>.com, but ideally, your solution would allow the customer to use their own vanity hostname for it, such as example.com.
The most common way to begin using a SaaS company’s service is to point a CNAME DNS record to the subdomain that the SaaS provider has created for your application. This ensures traffic gets to the right place, and it allows the SaaS provider to make infrastructure changes without Continue reading
BGP with Link State (LS) and the reasons for BGP-LS use
The post BGP with Link State (LS) and the reasons for BGP-LS use appeared first on Noction.
Non-Stop Forwarding 101
Non-Stop Forwarding (NSF) is one of those ideas that look great in a slide deck and marketing collaterals, but might turn into a giant can of worms once you try to implement them properly (see also: stackable switches or VMware Fault Tolerance).
NSF has been around for at least 15 years, so I’m positive at least some vendors got most of the details right; I’m also pretty sure a few people have scars to prove they’ve been around the non-optimal implementations.
Non-Stop Forwarding (NSF) 101
Non-Stop Forwarding (NSF) is one of those ideas that look great in a slide deck and marketing collaterals, but might turn into a giant can of worms once you try to implement them properly (see also: stackable switches or VMware Fault Tolerance).
NSF has been around for at least 15 years, so I’m positive at least some vendors got most of the details right; I’m also pretty sure a few people have scars to prove they’ve been around the non-optimal implementations.
What Net Admins Must Know about NicheStack Vulnerabilities
Researchers have found numerous new vulnerabilities impacting the NicheStack TCP/IP stack. These vulnerabilities could lead to heightened risks to technology managing critical infrastructure.Cutting Through the Fog Surrounding Private 5G Networks
A checklist for enterprises interested in the emerging private 5G network wireless opportunity.Best Questions to Ask In Job Interviews
Usually interviews are not supposed to make the person anxious and uncomfortable. As a part of an interviewer the questions should be asked in an extremely comfortable yet appropriate way, which does not make the person feel like he is being scrutinized or grilled. There are multiple techniques and ways to go about this process. However, when the interviewer asks the person whether or not they want to ask any questions regarding the company, their role, the job or position being offered, here are a few questions that can easily make one understand and get a deeper insight on what is being offered to them.
One needs to understand that as much as being able to answer the interviewer’s question is important; it is also considerably important to ask them the following significant questions. This will make them come off as a well balanced, ideal, and informative person which in return can help them stand out from others.
What Could Your Day-To-Day responsibilities look like?
Getting a deeper insight on the functionality of the job is extremely ideal and appropriate to ask during an interview. One has to know what their daily work load, their responsibilities, and the expectations could Continue reading
Switching to the i3 window manager
I have been using the awesome window manager for 10 years. It is a tiling window manager, configurable and extendable with the Lua language. Using a general-purpose programming language to configure every aspect is a double-edged sword. Due to laziness and the apparent difficulty of adapting my configuration—about 3000 lines—to newer releases, I was stuck with the 3.4 version, whose last release is from 2013.
It was time for a rewrite. Instead, I have switched to the i3 window manager, lured by the possibility to migrate to Wayland and Sway later with minimal pain. Using an embedded interpreter for configuration is not as important to me as it was in the past: it brings both complexity and brittleness.
The window manager is only one part of a desktop environment. There are several options for the other components. I am also introducing them in this post.
Comparing Forwarding Performance of Data Center Switches
One of my subscribers is trying to decide whether to buy an -EX or an -FX version of a Cisco Nexus data center switch:
I was comparing Cisco Nexus 93180YC-FX and Nexus 93180YC-EX. They have the same port distribution (48x 10/25G + 6x40/100G), 3.6 Tbps switching capacity, but the -FX version has just 1200 Mpps forwarding rate while EX version goes up to 2600 Mpps. What could be the reason for the difference in forwarding performance?
Both switches are single-ASIC switches. They have the same total switching bandwidth, thus it must take longer for the FX switch to forward a packet, resulting in reduced packet-per-seconds figure. It looks like the ASIC in the -FX switch is configured in more complex way: more functionality results in more complexity which results in either reduced performance or higher cost.