CVE-2020-17518
Apache Flink directory traversal attack: remote file writing through the REST API
7.5
HIGH
CVSS 3.1
EPSS 93.8%
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.
How to fix CVE-2020-17518
To remediate CVE-2020-17518, upgrade the affected package to a fixed version below.
- —upgrade to 1.11.3 or later
- —upgrade to 1.11.3 or later
Is CVE-2020-17518 being exploited?
Likely — EPSS is 93.8%, placing CVE-2020-17518 in the top tier of vulnerabilities by exploitation probability. Prioritise patching.
Affected packages (2)
- >= 1.5.1, < 1.11.3
- >= 1.5.1, < 1.11.3
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |