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                             CERT-Renater

                 Note d'Information No. 2021/VULN045
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DATE                : 26/01/2021

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S):  Systems running Apache Hadoop versions prior to
                                3.3.0, 3.2.2, 3.1.4, 2.10.1.

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http://mail-archives.apache.org/mod_mbox/hadoop-general/202101.mbox/%3cCAP+3qq6eDjjZG-G03RFRj9rrG4r1u=891UUEU2S8fbOCKTe4QA@mail.gmail.com%3e
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CVE-2020-9492. Apache Hadoop Potential privilege escalation

Severity: Important

Vendor: The Apache Software Foundation

Versions Affected:
3.2.0 to 3.2.1, 3.0.0-alpha1 to 3.1.3, 2.0.0-alpha to 2.10.0


Description:
WebHDFS client might send SPNEGO authorization header to remote URL
without proper verification. A crafty user can trigger services to
send server credentials to a webhdfs path for capturing the service
principal.


Mitigation:
Users of the affected versions should apply either of the following
mitigations:
- Set different http signature secrets and use dedicated hosts for
each privileged impersonation service (such as HiveServer2).
- Upgrade to 3.3.0, 3.2.2, 3.1.4, 2.10.1, or newer with TLS encryption
enabled and configure dfs.http.policy to HTTPS_ONLY.


Credit:
This issue was discovered by Kevin Risden.


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