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CVE-2020-17519— Apache Flink directory traversal attack: reading remote files through the REST API

Quick assessment

Affected
Apache Software Foundation Apache Flink
Exploitation
Confirmed exploitation in the wild; remediate immediately
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache Flink是美国阿帕奇软件（Apache）基金会的一款开源的分布式流数据处理引擎。该产品主要使用Java和Scala语言编写。 Apache Flink 版本 1.11.0 至 版本1.11.2 存在安全漏洞，该漏洞允许攻击者通过JobManager进程的REST接口读取JobManager本地文件系统上的任何文件。

AI Predicted 7.5 Difficulty: Easy KEV EPSS 97.81% · P100
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I. Basic Information for CVE-2020-17519

Vulnerability Information
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Vulnerability Title
Apache Flink directory traversal attack: reading remote files through the REST API
Source: CVE Program / CVE List V5
Vulnerability Description
A change introduced in Apache Flink 1.11.0 (and released in 1.11.1 and 1.11.2 as well) allows attackers to read any file on the local filesystem of the JobManager through the REST interface of the JobManager process. Access is restricted to files accessible by the JobManager process. All users should upgrade to Flink 1.11.3 or 1.12.0 if their Flink instance(s) are exposed. The issue was fixed in commit b561010b0ee741543c3953306037f00d7a9f0801 from apache/flink:master.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
对外部实体的文件或目录可访问
Source: CVE Program / CVE List V5
Vulnerability Title
Apache Flink 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache Flink是美国阿帕奇软件（Apache）基金会的一款开源的分布式流数据处理引擎。该产品主要使用Java和Scala语言编写。 Apache Flink 版本 1.11.0 至 版本1.11.2 存在安全漏洞，该漏洞允许攻击者通过JobManager进程的REST接口读取JobManager本地文件系统上的任何文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache Flink Apache Flink 1.11.0 to 1.11.2 -

II. Public POCs for CVE-2020-17519

# POC Description Source Link Shenlong Link
1 Apache Flink 目录遍历漏洞批量检测 (CVE-2020-17519) https://github.com/B1anda0/CVE-2020-17519 POC Details
2 None https://github.com/QmF0c3UK/CVE-2020-17519 POC Details
3 Apache Flink Directory Traversal (CVE-2020-17519) Nmap NSE Script https://github.com/dolevf/apache-flink-directory-traversal.nse POC Details
4 CVE-2020-17519 https://github.com/hoanx4/CVE-2020-17519 POC Details
5 [CVE-2020-17519] Apache Flink RESTful API Arbitrary File Read https://github.com/murataydemir/CVE-2020-17519 POC Details
6 CVE-2020-17519 EXP https://github.com/radbsie/CVE-2020-17519-Exp POC Details
7 CVE-2020-17519; Apache Flink 任意文件读取; 批量检测 https://github.com/yaunsky/CVE-2020-17519-Apache-Flink POC Details
8 A vulnerability scanner that detects CVE-2020-17519 vulnerabilities. https://github.com/Osyanina/westone-CVE-2020-17519-scanner POC Details
9 CVE-2020-17519 Cheetah https://github.com/givemefivw/CVE-2020-17519 POC Details
10 None https://github.com/zhangweijie11/CVE-2020-17519 POC Details
11 None https://github.com/GazettEl/CVE-2020-17519 POC Details
12 Apache Flink 1.11.0 (and released in 1.11.1 and 1.11.2 as well) allows attackers to read any file on the local filesystem of the JobManager through the REST interface of the JobManager process (aka local file inclusion). https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2020/CVE-2020-17519.yaml POC Details
13 None https://github.com/Threekiii/Awesome-POC/blob/master/%E5%BC%80%E5%8F%91%E6%A1%86%E6%9E%B6%E6%BC%8F%E6%B4%9E/Apache%20Flink%20%E7%9B%AE%E5%BD%95%E9%81%8D%E5%8E%86%E6%BC%8F%E6%B4%9E%20CVE-2020-17519.md POC Details
14 None https://github.com/chaitin/xray-plugins/blob/main/poc/manual/flink-jobmanager-cve-2020-17519-lfi.yml POC Details
15 https://github.com/vulhub/vulhub/blob/master/flink/CVE-2020-17519/README.md POC Details
16 CVE-2020-17519 https://github.com/dev-team-12x/CVE-2020-17519 POC Details
17 None https://github.com/shoucheng3/apache__flink_CVE-2020-17519_1-11-2 POC Details
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III. Intelligence Information for CVE-2020-17519

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Exploits & Public PoCs for CVE-2020-17519 (1)

Mailing List Discussions for CVE-2020-17519 (14)

IV. Related Vulnerabilities

Same product: Apache Flink
Same vendor: Apache Software Foundation
Same weakness: CWE-552

V. Comments for CVE-2020-17519

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