Path traversal in Flink - CVE-2020-17518
Published: January 5, 2021 / Updated: January 11, 2021
Vulnerability identifier: #VU49272
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-17518
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vulnerability details
The vulnerability allows a remote user to perform directory traversal attacks.
The vulnerability exists due to input validation error when processing directory traversal sequences while uploading files via a REST handler. A remote user can send a specially crafted HTTP request with a modified HTTP header and upload files to an arbitrary location on the system.
Affected software
Flink
How to mitigate CVE-2020-17518
Install update from vendor's website.
Flink - update to 1.11.3