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                             CERT-Renater

                 Note d'Information No. 2021/VULN182
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DATE                : 26/03/2021

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running Elasticsearch versions prior to
                                 7.11.2, 6.8.15,
                     Kibana versions prior to 7.12.0, 6.8.15,
                     Logstash versions prior to 7.12.0, 6.8.15.

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https://discuss.elastic.co/t/elastic-stack-7-12-0-and-6-8-15-security-update/268125
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Elastic Stack 7.12.0 and 6.8.15 Security Update
Announcements Security Announcements
douglasday (Douglas Day) March 23, 2021, 5:40pm #1


Elasticsearch Suggester & Profile API information disclosure flaw
(ESA-2021-06)

A document disclosure flaw was found in the Elasticsearch suggester and
profile API when Document and Field Level Security are enabled. The
suggester and profile API are normally disabled for an index when
document level security is enabled on the index. Certain queries are
able to enable the profiler and suggester which could lead to disclosing
the existence of documents and fields the attacker should not be able to
view.

Affected Versions:

All versions of Elasticsearch before 7.11.2 and 6.8.15.

Solutions and Mitigations:

Anyone using both Document and Field Level Security should upgrade to
Elasticsearch version 7.11.2 or 6.8.15. There is no known workaround for
this flaw.

CVSSv3 - 3.1: AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

CVE ID: CVE-2021-22135


Kibana Timeout Bypass (ESA-2021-07)

A flaw in Kibana’s session timeout was discovered where the
xpack.security.session.idleTimeout setting is not being respected. This
was caused by background polling activities unintentionally extending
authenticated users sessions, preventing a user session from timing out.

Affected Versions:

All versions of Kibana before 7.12.0 and 6.8.15.

Solutions and Mitigations:

Users should update their version of Kibana to 7.12.0 or 6.8.15.

CVSSv3 - 4.0: AV:P/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N

CVE ID: CVE-2021-22136


Elasticsearch field disclosure flaw (ESA-2021-08)

A document disclosure flaw was found in Elasticsearch when Document or
Field Level Security is used. Search queries do not properly preserve
security permissions when executing certain cross-cluster search
queries. This could result in the search disclosing the existence of
documents the attacker should not be able to view. This could result in
an attacker gaining additional insight into potentially sensitive
indices.

Thanks to Piotr Dłubisz, Security Consultant at JN Data A/S for
reporting this issue.

Affected Versions:

All versions of Elasticsearch before 6.8.15 and 7.11.2

Solutions and Mitigations:

Anyone using Document or Field Level Security should upgrade to
Elasticsearch version 7.11.2 or 6.8.15. There is no known workaround for
this flaw.

CVSSv3 - 2.6:AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N

CVE ID: CVE-2021-22137


Logstash certificate verification bypass (ESA-2021-09)

A TLS certificate validation flaw was found in the monitoring feature of
Logstash. When specifying a trusted server CA certificate Logstash would
not properly verify the certificate returned by the monitoring server.
This could result in a man in the middle style attack against the
Logstash monitoring data.

Affected Versions:

All versions of Logstash after 6.4.0 and before versions 6.8.15 and 7.12.0

Solutions and Mitigations:

Users should update their version of Logstash to 7.12.0 or 6.8.15.

CVSSv3 - 2.6:AV:A/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N

CVE ID: CVE-2021-22138


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+ CERT-RENATER       |    tel : 01-53-94-20-44          +
+ 23/25 Rue Daviel   |    fax : 01-53-94-20-41          +
+ 75013 Paris        |    email:cert@support.renater.fr +
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