patching là gì

As the number vulnerabilities hit a historic high, battle-worn security teams are upping their patching game.

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Patch management is a thankless job. Data shows, despite best efforts, that 80 percent of enterprise applications have at least one unpatched vulnerability in them, according research by Veracode.

It is not for lack of trying that vulnerabilities persist. Last year 16,500 vulnerabilities were reported, making patching each one nearly an impossible task for any one company. Perhaps it shouldn’t be a surprise that Windows patching times appear to tướng be moving in the wrong direction. According to tướng Edgescan, the average of 63 days to tướng patch in 2017 to tướng 81 days in 2018.

What these statistics reveal is a process suffering under the weight of a shifting IT ecosystem that has ballooned to tướng include a flood of bug submissions from a new crop of bounty programs, scrutinizing the growing army of chip-enabled gear.

The good news is that there’s hope. Patching experts say there are concrete steps companies can take to tướng avoid patch fatigue. Identifying the problems is an important first step.

85 percent of enterprise applications have one flaw

Click to tướng Enlarge (courtesy Veracode)

Building a Better Patch Process

“One of the biggest patching challenges is first identifying everything that needs to tướng be patched,” said Chris Goettl, director of product management and security for Ivanti. “The challenge becomes keeping a handle on how big a company’s universe of devices is — and knowing what has been patched and what still needs to tướng be.”

Add in vulnerabilities related to tướng software dependencies, such as the third-party code underlying software, and patching becomes even more arduous. Code repositories, open-source projects and small vendors poorly communicate bugs in their often complex library dependencies, he said.

Stagefright, Devil’s Ivy and the Zip Slip flaw  are just of few examples of vulnerabilities affecting thousands of open-source projects. And last month, VLC developer VideoLAN alerted customers of a “high-risk” bug tied to tướng a third-party component called MKV demuxer — a component responsible for multiplexing digital and analog files. The bug could allow an adversary to tướng craft a malicious .MKV đoạn phim tệp tin that could be used in an attack to tướng gain control of the victim’s PC, according to tướng VideoLAN.

“We assume a given developer is going to tướng provide patches for their code. Obviously, they are going to tướng fix any of vulnerabilities. But almost every product these days is based on other third-party components. There is Apache Struts, Microsoft .NET core and Java development kits. It’s very important that the components are updated as well,” said Todd Schell, senior product manager, security, for Ivanti.

These are vulnerabilities that are compiled into the code and aren’t something found by regular IT staff, Schell said. Developers, not just IT and security operations staff, need to tướng be aware – pushing companies to tướng adopt a DevOps approach to tướng security.

A Race to tướng Zero

Goettl also noted that there is a race by hackers and researchers alike to tướng shrink the time between a zero-day bug discovery and the publishing of a proof-of-concept (PoC) exploit of the flaw.

In the case of the “wormable” vulnerability known as BlueKeep (CVE-2019-0708), Microsoft patched the bug on May 14, and by May 22 a proof-of-concept (PoC) exploit of the flaw was demonstrated. Other PoCs followed in the subsequent months. On Thursday, Palo Alto Networks published three additional ways to tướng exploit system that have not been patched for BlueKeep.

PoCs offer security professionals vital and needed clues on how to tướng identify a threat and mitigate against it. But, if patching isn’t part of the PoC discovery and fix, it could lead to tướng catastrophic results – think EternalBlue and WannaCry.

As of July, the number of systems that remain exposed and unpatched to tướng BlueKeep is close to tướng 800,000, according to tướng BitSight.

Making Sense of CVSS Scores

Tyler Reguly, manager of security, researcher and development for Tripwire, points out that the sheer number of patches that face IT and security teams leads to tướng patch fatigue. The Common Vulnerability Scoring System (CVSS) is an industry standard for assessing the severity of security vulnerabilities and is meant to tướng help with that; CVSS scores assign severity scores to tướng vulnerabilities with the intent of giving security professionals the ability to tướng prioritize responses.

However, oftentimes the severity score is higher kêu ca the threat really warrants; and sometimes it’s the other way around, Reguly said.

“What you over up with is a lot of people looking at these CVSS scores, confused, asking themselves ‘what should I patch, when should I patch it,'” he said.

Matthew Howell, senior director of product for Flashpoint, recommends that when it comes to tướng patch prioritization, IT needs to tướng evaluate the threat variables of a bug as they relate to tướng one’s specific network. In a recent blog post, he recommends that security teams ask themselves:

  • How likely the vulnerability is to tướng be exploited in the wild?
  • If the vulnerability is exploited in the wild, how likely it is to tướng impact your organization?
  • If the vulnerability is exploited at your organization, what impact it is likely to tướng have?

The CVSS score assigned to tướng a vulnerability reflects severity, not risk, Howell wrote.

Automating the Patching Process

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Reguly says one of the best antidotes to tướng fend off patching fatigue is automating as much of the patching process as possible. “You really need to tướng architect to tướng automate. That includes patching software, but also the processes as well,” he said.

That includes configuring orchestration tools such as Puppet to tướng help automate the patching process. “If possible, some patch software supports APIs [and] can be used to tướng tie in through an API for patch management and configuration management,” Reguly said.

He said automation also includes patch validation and making sure patches and security updates are implemented properly. Lastly, he recommends determining if a software vendor’s service-level agreement might also be leveraged to tướng help with the patching process.

Driving a Stake in the Heart of a Check-Box Security Mentality

Jimmy Graham, senior director of vulnerability management, for Qualys, calls the process vulnerability management, not just patch management. He warns against focusing exclusively on patch management to tướng the exclusion of the bigger security picture.

He promotes the idea of vulnerability management lifecycles that start with asset inventory, collecting vulnerability information locally, prioritizing vulnerabilities and then moving to tướng patch management.

“Patch management is a cyclical process where you are patching systems based on the fact a patch was released by a vendor. Vulnerability management is there to tướng make sure that patching was effective as well as the configuration management,” Graham said.

Best Practices

Best practices, according to tướng Graham, include creating a patching cadence based on vendor releases. IT should also identify and prioritize patches based on the company’s unique infrastructure, and then test and deploy the patches themselves. Follow-up is just as important, he said, such as documenting the process for each technology patched — from operating systems to tướng databases.

He also recommends patching and updating “golden images” (master software images used by IT for mass software deployment) at least quarterly. “That way all new systems are remediated before they go into production,” he said.

The goal is to tướng significantly reduce or eliminate one-off patching.”If you’ve ever tried to tướng figure out what version of Flash to tướng deploy, then you aren’t doing it right,” Graham said.


The DevSecOps Approach

Still others advocate taking a DevSecOps approach to tướng security — i.e., a blending of software development, IT operations and security practices into a streamlined system lifecycle.

“There is a strong correlation between how many times an organization scans and how quickly they address their vulnerabilities,” Veracode said in its State of Software Security report.  “DevOps, or agile-driven development teams, are scanning more often, and as a result, they are making incremental [security] improvements every time they test.”

Veracode asserts that once organizations hit 300 or more internal scans per year, companies are seeing the “fix velocity going into overdrive.” Therefore, DevSecOps in theory could be vital when it comes to tướng spotting bugs early in the development process – making vulnerabilities easier, faster and less expensive it is to tướng fix, security experts say .

There’s a caveat to tướng this though: The idea presupposes an unlikely harmonious relationship between developers and security teams. Often development teams are under pressure to tướng deliver feature-rich applications on near impossible deadlines. Security teams, on the other hand, are under growing pressure to tướng safeguard data.

Patching Landscape Moves to tướng Cloud

Things are changing in the patching landscape as more compute moves to tướng the cloud. Applications such as Salesforce and Office 365 represent a growing number cloud-based solutions running on AWS, Google Compute and Microsoft Azure. As the move to tướng cloud services grows, cloud providers share the responsibility for security with their customers, Schell said.

The Cloud Native Computing Foundation, the organization behind popular container project Kubernetes, has had to tướng tackle a number of vulnerabilities in its platform. One bug found last month could allow an adversary to tướng access, modify or delete computing and storage resources configured across a cluster. Also last month there was an Azure update addressing a Kubernetes component that had a known vulnerability.

The shift from on-premise to tướng off-premise (cloud) computing is a game changer for security teams, and it forces them to tướng forfeit some control to tướng platform providers, Schell said.

“It’s fully upon the shoulders of the [cloud] service provider to tướng make sure the application is running with the most recent performance enhancements and security updates. And there is not much we can tự as users,” he said.

(A portion of this article is adopted from a previous Threatpost webinar “Streamlining Patch Management“. In this 60-minute presentation, available on-demand, experts Todd Schell, senior product manager, security, for Ivanti; Tyler Reguly, manager of security R&D, for Tripwire; and Jimmy Graham, senior directory, vulnerability management, for Qualys, are joined by Threatpost editor Tom Spring to tướng discuss streamlining patch management and offer patching advice, tips and tricks.)

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