Path Traversal in Apache Flink
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 · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.491 (98.9th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 99th percentile — 98.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.500 · newest: 0.491 · change: -0.009
Affected products
- Apache Flink
- Apache Software Foundation Flink — versions Apache Flink 1.5.1 to 1.11.2
Weakness classification (CWE)
Public proof-of-concept exploits
References
- lists.apache.org/thread.html/rb43cd476419a48be89c1339b527a18116f23eec5b6df2b2ac… (Mailing List, Vendor Advisory)
- lists.apache.org/thread.html/rb43cd476419a48be89c1339b527a18116f23eec5b6df2b2ac… (mailing-list)
- lists.apache.org/thread.html/rb43cd476419a48be89c1339b527a18116f23eec5b6df2b2ac… (mailing-list)
- www.openwall.com/lists/oss-security/2021/01/05/1 (mailing-list, Mailing List, Third Party Advisory)
- lists.apache.org/thread.html/r28f17e564950d663e68cc6fe75756012dda62ac623766bb9b… (mailing-list)
- lists.apache.org/thread.html/rd6a1a0e2d73220a65a8f6535bbcd24bb66adb0d046c4a1aa1… (mailing-list)
- lists.apache.org/thread.html/r8167f30c4c60a11b8d5be3f55537beeda629be61196e693bd… (mailing-list)
- lists.apache.org/thread.html/r0b000dc028616d33cb9aa388eb45d516b789cab0024dad94b… (mailing-list)
- lists.apache.org/thread.html/r705fb2211b82c9f1f8d2b1d4c823bcbca50402ba09b96608e… (mailing-list)
- lists.apache.org/thread.html/r5444acac3407ef6397d6aef1b5aec2db53b4b88ef221e6308… (mailing-list)
Frequently asked questions
- What is CVE-2020-17518?
- CVE-2020-17518 is a high-severity vulnerability in Apache Flink, classified under Relative Path Traversal. CVSS score: 7.5/10. Published 2021-01-05.
- How severe is CVE-2020-17518?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2020-17518 known to be exploited?
- 58 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.