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                             CERT-Renater

                 Note d'Information No. 2020/VULN031
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DATE                : 20/01/2020

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running Apache CXF versions prior to
                                     3.3.5, 3.2.12.

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http://mail-archives.apache.org/mod_mbox/www-announce/202001.mbox/%3cCAB8XdGAgxPurbCOdoApyhCaAaFCZVxJGAAqkpr6oqYFDkaLcRw@mail.gmail.com%3e
http://mail-archives.apache.org/mod_mbox/www-announce/202001.mbox/%3cCAB8XdGDDJf-0JgPLpWhEwcomkKAXyVRy7EyvuLLWqp=kUdVjxw@mail.gmail.com%3e
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CVE-2019-12423: Apache CXF OpenId Connect JWK Keys service returns
private/secret credentials if configured with a jwk keystore

Severity: Moderate

Vendor: The Apache Software Foundation

Versions Affected:

This vulnerability affects all versions of Apache CXF prior to 3.3.5 and
3.2.12.


Description:

Apache CXF ships with a OpenId Connect JWK Keys service, which allows a
client to obtain the public keys in JWK format, which can then be used
to verify the signature of tokens issued by the service.

Typically, the service obtains the public key from a local keystore
(JKS/PKCS12) by specifing the path of the keystore and the alias of the
keystore entry. This case is not vulnerable.

However it is also possible to obtain the keys from a JWK keystore file,
by setting the configuration parameter "rs.security.keystore.type" to
"jwk".
For
this case all keys are returned in this file "as is", including all
private key and secret key credentials.

This is an obvious security risk if the user has configured the
signature keystore file with private or secret key credentials.

- From CXF 3.3.5 and 3.2.12, it is mandatory to specify an alias
corresponding to the id of the key in the JWK file, and only this key is
returned. In addition, any private key information is omitted by
default. "oct" keys, which contain secret keys, are not returned at all.


Mitigation:

Users of Apache CXF that user the OpenId Connect JWK keys service as
part of their OpenId Connect service should update to either the 3.3.5
or 3.2.12 releases.

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CVE-2019-17573: Apache CXF Reflected XSS in the services listing page

Severity: Moderate

Vendor: The Apache Software Foundation

Versions Affected:

This vulnerability affects all versions of Apache CXF prior to 3.3.5 and
3.2.12.


Description:

By default, Apache CXF creates a /services page containing a listing of
the available endpoint names and addresses. This webpage is vulnerable
to a reflected Cross-Site Scripting (XSS) attack, which allows a
malicious actor to inject javascript into the web page.

Please note that the attack exploits a feature which is not typically
not present in modern browsers, who remove dot segments before sending
the request. However, Mobile applications may be vulnerable.


Mitigation:

Users of Apache CXF should update to either 3.3.5 or 3.2.12.
Alternatively, it is possible to disable the service listing altogether
by setting the
"hide-service-list-page" servlet parameter to "true".


Credit:

We would like to thank the GE cyber security team for reporting this
issue.


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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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