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I. Basic Information for CVE-2020-17518
Vulnerability Information
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Vulnerability Title
Apache Flink directory traversal attack: remote file writing through the REST API
Source: NVD (National Vulnerability Database)
Vulnerability Description
Apache Flink 1.5.1 introduced a REST handler that allows you to write an uploaded file to an arbitrary location on the local file system, through a maliciously modified HTTP HEADER. The files can be written to any location accessible by Flink 1.5.1. 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 a5264a6f41524afe8ceadf1d8ddc8c80f323ebc4 from apache/flink:master.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
相对路径遍历
Source: NVD (National Vulnerability Database)
Vulnerability Title
Apache Flink 路径遍历漏洞
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 1.5.1 存在安全漏洞，该漏洞源于一个REST处理程序允许攻击者通过恶意修改的HTTP头将上传的文件写入到本地文件系统上的任意位置。
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)
Affected Products
VendorProductAffected VersionsCPESubscribe
Apache Software FoundationApache Flink Apache Flink 1.5.1 to 1.11.2 -
II. Public POCs for CVE-2020-17518
#POC DescriptionSource LinkShenlong Link
1Nonehttps://github.com/QmF0c3UK/CVE-2020-17518POC Details
2[CVE-2020-17518] Apache Flink RESTful API Arbitrary File Upload via Directory Traversalhttps://github.com/murataydemir/CVE-2020-17518POC Details
3利用Apache Flink CVE-2020-17518 getshellhttps://github.com/rakjong/Flink-CVE-2020-17518-getshellPOC Details
4Apache Flink 1.5.1 is vulnerable to local file inclusion because of a REST handler that allows file uploads to an arbitrary location on the local file system through a maliciously modified HTTP HEADER. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2020/CVE-2020-17518.yamlPOC Details
5Nonehttps://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%E5%B0%8F%E4%BA%8E1.9.1%E8%BF%9C%E7%A8%8B%E4%BB%A3%E7%A0%81%E6%89%A7%E8%A1%8C%20CVE-2020-17518.mdPOC Details
6https://github.com/vulhub/vulhub/blob/master/flink/CVE-2020-17518/README.mdPOC Details
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III. Intelligence Information for CVE-2020-17518
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IV. Related Vulnerabilities
Same product: Apache Flink
Same vendor: Apache Software Foundation
Same weakness: CWE-23
V. Comments for CVE-2020-17518

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