Public exploit available
Public proof-of-concept or exploit code exists (ExploitDB / Metasploit / Nuclei).

CVE-2020-17518

CWE-23CWE-22 — Path Traversal8 documents8 sources
Severity
7.5HIGH
EPSS
93.8%
top 0.14%
CISA KEV
Not in KEV
Exploit
PoC available
Public exploit / PoC exists
Affected products
2
Apache FlinkApache Software Foundation Apache Flink
Timeline
PublishedJan 5
Latest updateFeb 9

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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:NExploitability: 3.9 | Impact: 3.6

Affected Packages3 packages

▶NVDapache/flink1.5.1 — 1.11.3
▶Mavenorg.apache.flink:flink-runtime1.5.1 — 1.11.3
▶CVEListV5apache_software_foundation/apache_flinkApache Flink 1.5.1 to 1.11.2

🔴Vulnerability Details

4
GHSA
Upload of file to arbitrary path in Apache Flink↗2022-02-09
▶
OSV
Upload of file to arbitrary path in Apache Flink↗2022-02-09
▶
CVEList
Apache Flink directory traversal attack: remote file writing through the REST API↗2021-01-05
▶
VulnCheck
Apache flink Relative Path Traversal↗2020
▶

💥Exploits & PoCs

1
Nuclei
Apache Flink 1.5.1 - Local File Inclusion
▶

📋Vendor Advisories

2
Red Hat
apache-flink: directory traversal attack allows remote file writing through the REST API↗2021-01-05
▶
Apache
Apache flink: CVE-2020-17518↗
▶