Bug 1351593 (CVE-2016-5404) - CVE-2016-5404 ipa: Insufficient privileges check in certificate revocation
Summary: CVE-2016-5404 ipa: Insufficient privileges check in certificate revocation
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2016-5404
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1366979 1366980 1366981 1366982 1367883
Blocks: 1351595
TreeView+ depends on / blocked
 
Reported: 2016-06-30 11:54 UTC by Andrej Nemec
Modified: 2021-02-17 03:38 UTC (History)
8 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
An insufficient permission check issue was found in the way IPA server treats certificate revocation requests. An attacker logged in with the 'retrieve certificate' permission enabled could use this flaw to revoke certificates, possibly triggering a denial of service attack.
Clone Of:
Environment:
Last Closed: 2016-09-01 14:11:59 UTC


Attachments (Terms of Use)
Patch for ipa-4.4 (5.45 KB, patch)
2016-08-01 12:34 UTC, Fraser Tweedale
no flags Details | Diff
Patch for ipa-4.3 (4.63 KB, patch)
2016-08-01 12:35 UTC, Fraser Tweedale
no flags Details | Diff
Patch for ipa-4.2 (4.63 KB, patch)
2016-08-01 12:35 UTC, Fraser Tweedale
no flags Details | Diff
Patch for ipa-4.1 (4.67 KB, patch)
2016-08-01 12:36 UTC, Fraser Tweedale
no flags Details | Diff
Patch for ipa-3.0 AND ipa-2.1 (4.71 KB, patch)
2016-08-01 12:38 UTC, Fraser Tweedale
no flags Details | Diff


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2016:1797 0 normal SHIPPED_LIVE Moderate: ipa security update 2016-09-01 17:57:02 UTC

Description Andrej Nemec 2016-06-30 11:54:16 UTC
Summary: a user with 'retrieve certificate' permission can revoke
any certificate.  The 'revoke certificate' permission is not
required.

Detail: the 'cert_revoke' command does check for the 'revoke
certificate' permission, however, if an access error is raised, it
then invokes the 'cert_show' command.  The rational was to re-use a
"self-service" check that is part of the 'cert_show' command,
however, it is sufficient that 'cert_show' execute successfully for
'cert_revoke' to recover from the access error and continue.
Therefore, anyone with 'retrieve certificate' permission can revoke
*any* certificate.

Impact: anyone with 'retrieve certificate' permission can cause
various kinds of DoS by revoking any cert they want.

Scope: Every supported versions of RHEL with IDM are affected.

Comment 1 Andrej Nemec 2016-06-30 11:54:21 UTC
Acknowledgments:

Name: Fraser Tweedale (Red Hat)

Comment 16 Cedric Buissart 2016-08-17 17:25:01 UTC
Created freeipa tracking bugs for this issue:

Affects: fedora-all [bug 1367883]

Comment 17 Fedora Update System 2016-08-29 18:54:00 UTC
freeipa-4.3.2-2.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.

Comment 18 errata-xmlrpc 2016-09-01 13:58:44 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7
  Red Hat Enterprise Linux 6

Via RHSA-2016:1797 https://rhn.redhat.com/errata/RHSA-2016-1797.html


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