Vulnerability Details : CVE-2020-17518

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.
Published 2021-01-05 12:15:12
Updated 2021-03-18 12:06:00
Source Apache Software Foundation
View at NVD,   CVE.org
Vulnerability category: Directory traversal

Products affected by CVE-2020-17518

Exploit prediction scoring system (EPSS) score for CVE-2020-17518

EPSS FAQ
73.07%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 98 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2020-17518

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
5.0
 MEDIUM AV:N/AC:L/Au:N/C:N/I:P/A:N
10.0
2.9
 NIST
7.5
 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
3.9
3.6
 NIST

CWE ids for CVE-2020-17518

  • The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
    Assigned by: nvd@nist.gov (Primary)
  • The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize sequences such as ".." that can resolve to a location that is outside of that directory.
    Assigned by: security@apache.org (Secondary)

References for CVE-2020-17518

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