CISA Order Highlights Persistent Risk at Network Edge

Read Time:6 Minute, 19 Second

The U.S. government agency in charge of improving the nation’s cybersecurity posture is ordering all federal civilian agencies to take new measures to restrict access to Internet-exposed networking equipment. The directive comes amid a surge in attacks targeting previously unknown vulnerabilities in widely used security and networking appliances.

Under a new order from the Cybersecurity and Infrastructure Security Agency (CISA), federal agencies will have 14 days to respond to any reports from CISA about misconfigured or Internet-exposed networking equipment. The directive applies to any networking devices — such as firewalls, routers and load balancers — that allow remote authentication or administration.

The order requires federal departments to limit access so that only authorized users on an agency’s local or internal network can reach the management interfaces of these devices. CISA’s mandate follows a slew of recent attacks wherein attackers exploited zero-day flaws in popular networking products to conduct ransomware and cyber espionage attacks on victim organizations.

Earlier today, incident response firm Mandiant revealed that since at least October 2022, Chinese cyber spies have been exploiting a zero-day vulnerability in many email security gateway (ESG) appliances sold by California-based Barracuda Networks to hoover up email from organizations using these devices.

Barracuda was alerted to the exploitation of a zero-day in its products in mid-May, and two days later the company pushed a security update to address the flaw in all affected devices. But last week, Barracuda took the highly unusual step of offering to replace compromised ESGs, evidently in response to malware that altered the systems in such a fundamental way that they could no longer be secured remotely with software updates.

According to Mandiant, a previously unidentified Chinese hacking group was responsible for exploiting the Barracuda flaw, and appeared to be searching through victim organization email records for accounts “belonging to individuals working for a government with political or strategic interest to [China] while this victim government was participating in high-level, diplomatic meetings with other countries.”

When security experts began raising the alarm about a possible zero-day in Barracuda’s products, the Chinese hacking group altered their tactics, techniques and procedures (TTPs) in response to Barracuda’s efforts to contain and remediate the incident, Mandiant found.

Mandiant said the attackers will continue to change their tactics and malware, “especially as network defenders continue to take action against this adversary and their activity is further exposed by the infosec community.”

Meanwhile, this week we learned more details about the ongoing exploitation of a zero-day flaw in a broad range of virtual private networking (VPN) products made by Fortinet — devices many organizations rely on to facilitate remote network access for employees.

On June 11, Fortinet released a half-dozen security updates for its FortiOS firmware, including a weakness that researchers said allows an attacker to run malware on virtually any Fortinet SSL VPN appliance. The researchers found that just being able to reach the management interface for a vulnerable Fortinet SSL VPN appliance was enough to completely compromise the devices.

“This is reachable pre-authentication, on every SSL VPN appliance,” French vulnerability researcher Charles Fol tweeted. “Patch your #Fortigate.”

In details published on June 12, Fortinet confirmed that one of the vulnerabilities (CVE-2023-27997) is being actively exploited. The company said it discovered the weakness in an internal code audit that began in January 2023 — when it learned that Chinese hackers were exploiting a different zero-day flaw in its products.

Shodan.io, the search engine made for finding Internet of Things devices, reports that there are currently more than a half-million vulnerable Fortinet devices reachable via the public Internet.

The new cybersecurity directive from CISA orders agencies to remove any networking device management interfaces from the internet by making them only accessible from an internal enterprise network (CISA recommends an isolated management network). CISA also says agencies should “deploy capabilities, as part of a Zero Trust Architecture, that enforce access control to the interface through a policy enforcement point separate from the interface itself (preferred action).”

Security experts say CISA’s directive highlights the reality that cyberspies and ransomware gangs are making it increasingly risky for organizations to expose any devices to the public Internet, because these groups have strong incentives to probe such devices for previously unknown security vulnerabilities.

The most glaring example of this dynamic can be seen in the frequency with which ransomware groups have discovered and pounced on zero-day flaws in widely-used file-transfer protocol (FTP) applications. One ransomware gang in particular — Cl0p — has repeatedly exploited zero day bugs in various FTP appliances to extort tens of millions of dollars from hundreds of ransomware victims.

On February 2, KrebsOnSecurity broke the news that attackers were exploiting a zero-day vulnerability in the GoAnywhere FTP appliance by Fortra. By the time security updates were available to fix the vulnerability, Cl0p had already used it to steal data from more than a hundred organizations running Fortra’s FTP appliance.

According to CISA, on May 27, Cl0p began exploiting a previously unknown flaw in MOVEit Transfer, a popular Internet-facing file transfer application. MOVEit parent Progress Software has since released security updates to address the weakness, but Cl0p claims to have already used it to compromise hundreds of victim organizations. TechCrunch has been tracking the fallout from victim organizations, which range from banks and insurance providers to universities and healthcare entities.

The always on-point weekly security news podcast Risky Business has recently been urging organizations to jettison any and all FTP appliances, noting that Cl0p (or another crime gang) is likely to visit the same treatment on other FTP appliance vendors.

But that sound advice doesn’t exactly scale for mid-tier networking devices like Barracuda ESGs or Fortinet SSL VPNs, which are particularly prominent in small to mid-sized organizations.

“It’s not like FTP services, you can’t tell an enterprise [to] turn off the VPN [because] the productivity hit of disconnecting the VPN is terminal, it’s a non-starter,” Risky Business co-host Adam Boileau said on this week’s show. “So how to mitigate the impact of having to use a domain-joined network appliance at the edge of your network that is going to get zero-day in it? There’s no good answer.”

Risky Business founder Patrick Gray said the COVID-19 pandemic breathed new life into entire classes of networking appliances that rely on code which was never designed with today’s threat models in mind.

“In the years leading up to the pandemic, the push towards identity-aware proxies and zero trust everything and moving away from this type of equipment was gradual, but it was happening,” Gray said. “And then COVID-19 hit and everybody had to go work from home, and there really was one option to get going quickly — which was to deploy VPN concentrators with enterprise features.”

Gray said the security industry had been focused on building the next generation of remote access tools that are more security-hardened, but when the pandemic hit organizations scrambled to cobble together whatever they could.

“The only stuff available in the market was all this old crap that is not QA’d properly, and every time you shake them CVEs fall out,” Gray remarked, calling the pandemic, “a shot in the arm” to companies like Fortinet and Barracuda.

“They sold so many VPNs through the pandemic and this is the hangover,” Gray said. “COVID-19 extended the life of these companies and technologies, and that’s unfortunate.”

Read More

What is NFV

Read Time:2 Minute, 34 Second

In today’s fast-paced digital landscape, businesses proactively seek innovative ways to optimize their networks, enhance operational efficiency, and reduce costs. Network Functions Virtualization (NFV) emerges as a transformative technology that leads the charge.

NFV revolutionizes traditional, hardware-based network functions by converting them into flexible, software-based solutions. Virtual Network Functions (VNFs) can be deployed on commodity servers, cloud infrastructure, or even in data centers, freeing businesses from the constraints of specialized, proprietary hardware.

NFV simplifies network operations and significantly reduces hardware costs by allowing network functions, such as firewalls, load balancers, and routers, to run on general-purpose servers. This leads to substantial savings in both capital expenditure (CAPEX) and operational expenditure (OPEX).

Furthermore, NFV equips businesses with the agility and flexibility necessary to adapt quickly to changing network demands. Unlike traditional hardware-based network functions, which are static and require manual configuration, VNFs can be rapidly deployed, scaled, or modified to accommodate fluctuating network requirements. This provides a level of scalability and agility that was previously unattainable.

NFV also streamlines network management and automation. With NFV Management and Orchestration (MANO) systems, businesses can centrally manage and orchestrate VNFs, reducing the complexity and manual effort associated with network administration. This simplifies the deployment and management of network services, improves efficiency, and minimizes the risk of errors.

Moreover, NFV contributes to more sustainable and environmentally friendly operations by reducing energy consumption. By consolidating multiple network functions onto shared infrastructure, NFV lowers energy usage and cooling requirements.

The NFV architecture, standardized by the European Telecommunications Standards Institute (ETSI), provides a blueprint for implementing and deploying NFV solutions. It comprises three main components:

Virtual Network Functions (VNFs): Software implementations of network functions deployable on Network Function Virtualization Infrastructure (NFVI). Each VNF runs on generic server hardware and interconnects with other VNFs to create extensive networking communication services.
NFV Infrastructure (NFVI): The environment hosting the VNFs. It includes the hardware resources and the software layers that abstract, pool, and manage the physical resources.
NFV Management and Orchestration (MANO): The framework orchestrating and managing physical and/or virtual resources that support the VNFs. The MANO layer consists of the NFV Orchestrator, VNF Manager, and Virtualized Infrastructure Manager (VIM).

This architecture decouples network functions from proprietary hardware appliance which is how NFV enhances network flexibility, scalability, and service deployment speed, while cutting costs and energy consumption.

NFV not only brings cost savings and efficiency but also fosters innovation. The ability to quickly and easily deploy new network functions enables businesses to experiment with new services and features, accelerating innovation and enhancing competitiveness.

NFV represents a paradigm shift in networking. By transforming rigid, hardware-based network functions into flexible, software-based solutions, NFV equips businesses with the agility, cost-efficiency, and innovation potential necessary to thrive in the digital age. Embracing NFV is a strategic move for businesses looking to future-proof their networks and maintain a competitive edge in the digital era. Don’t let your current network setup hold you back; explore the possibilities NFV offers with AT&T Cybersecurity and transform your network infrastructure today.

Read More

USN-6155-2: Requests vulnerability

Read Time:15 Second

USN-6155-1 fixed a vulnerability in Requests. This update provides
the corresponding update for Ubuntu 16.04 ESM and 18.04 ESM.

Original advisory details:

Dennis Brinkrolf and Tobias Funke discovered that Requests incorrectly
leaked Proxy-Authorization headers. A remote attacker could possibly use
this issue to obtain sensitive information.

Read More

5 best practices to ensure the security of third-party APIs

Read Time:39 Second

When organizations consider application programming interface (API) security, they typically focus on securing APIs that are written in-house. However, not all the APIs that companies use are developed internally, rather some are designed and developed by other organizations. The problem is that many companies don’t realize that using third-party APIs can expose their applications to security issues, such as malware, data breaches, and unauthorized access.

Third-party APIs are software interfaces that allow organizations to leverage third-party functionality or data on their own websites or applications. These third-party APIs enable developers to integrate their applications or systems with external services, data, or functionality, says Phil Quitugua, director of cybersecurity at technology research and advisory firm ISG.

To read this article in full, please click here

Read More