Bug 1855273 (CVE-2020-15720) - CVE-2020-15720 pki: Dogtag's python client does not validate certificates
Summary: CVE-2020-15720 pki: Dogtag's python client does not validate certificates
Alias: CVE-2020-15720
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 1426572 1855854 1855857 1926320 1926321
Blocks: 1850232
TreeView+ depends on / blocked
Reported: 2020-07-09 12:27 UTC by Cedric Buissart
Modified: 2021-02-16 19:41 UTC (History)
6 users (show)

Fixed In Version: pki 10.9.0
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in PKI, where the dogtag's pki.client.PKIConnection class disables the python-requests certificate validation. This flaw allows an attacker to intercept a connection between a FreeIPA client and a server, and execute an active Man-in-the-Middle attack. The highest threat from this vulnerability is to confidentiality and integrity.
Clone Of:
Last Closed: 2020-11-04 02:26:19 UTC

Attachments (Terms of Use)

System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2020:4847 0 None None None 2020-11-04 03:14:59 UTC

Description Cedric Buissart 2020-07-09 12:27:02 UTC
Dogtag's pki.client.PKIConnection class disables python-requests certificate validation. The argument `verify=False` means that no certificate validation is performed at all [2]. The client accepts any certificate. Since the verify parameter is hard-coded in all request functions, it is not possible to override the setting.

PKIConnection should use requests default settings (verify with default certs) and offer an API to override default CA certs or disable requests.

[2] https://requests.readthedocs.io/en/master/user/advanced/#ssl-cert-verification

Comment 1 Cedric Buissart 2020-07-09 12:27:08 UTC

Name: Christian Heimes

Comment 2 Cedric Buissart 2020-07-10 17:13:58 UTC
Created pki-core tracking bugs for this issue:

Affects: fedora-all [bug 1855854]

Comment 6 Cedric Buissart 2020-10-15 07:38:41 UTC

In PKI, the pki.client.PKIConnection python class is used by the `pki-server` and `pkispawn` commands. `pki-server` runs locally on the server, thus not subject to a Person in the Middle attack. `pkispawn` may access remote node in decentralized or cloned contexts.

Identity Management (IPA) command line interface (the vault related sub-commands) may call pki.client.PKIConnection().

Comment 7 Product Security DevOps Team 2020-11-04 02:26:19 UTC
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):


Comment 8 errata-xmlrpc 2020-11-04 03:14:59 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2020:4847 https://access.redhat.com/errata/RHSA-2020:4847

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