Bug 1209573 (CVE-2015-1854) - CVE-2015-1854 389-ds-base: access control bypass with modrdn
Summary: CVE-2015-1854 389-ds-base: access control bypass with modrdn
Status: CLOSED ERRATA
Alias: CVE-2015-1854
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact: Viktor Ashirov
URL:
Whiteboard: impact=important,public=20150428,repo...
Keywords: Security
Depends On: 1212894 1212895 1216203
Blocks: 1209577
TreeView+ depends on / blocked
 
Reported: 2015-04-07 16:48 UTC by Vasyl Kaigorodov
Modified: 2019-06-08 20:31 UTC (History)
10 users (show)

(edit)
A flaw was found in the way Red Hat Directory Server performed authorization of modrdn operations. An unauthenticated attacker able to issue an ldapmodrdn call to the directory server could use this flaw to perform unauthorized modifications of entries in the directory server.
Clone Of:
(edit)
Last Closed: 2015-04-28 18:31:07 UTC


Attachments (Terms of Use)


External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2015:0895 normal SHIPPED_LIVE Important: 389-ds-base security update 2015-04-28 22:17:22 UTC

Description Vasyl Kaigorodov 2015-04-07 16:48:51 UTC
An access control bypass flaw was found in modrdn. In particular if a user has a rdn like uid=username, then the user can change its own rdn to any value that is a superstring of the current name bypassing access control.

This issue could be reproduced by the following:

ldapmodrnd -Y GSSAPI -r uid=testuser,cn=users,cn=accounts,dc=test,dc=ipa uid=testuser_extended_without_permission

The above succeeds and renames the user.

No authentication whatsoever is necessary. An anonymous user can completely hose a server (if not worse) by just renaming any entry it pleases.

If ACIs are employed to hide entries and those entries are targeted by
name then it is also possible to reveal those contents by renaming the
entry and falling off the ACI protection.


Acknowledgements:

This issue was discovered by Simo Sorce of Red Hat.

Comment 10 Huzaifa S. Sidhpurwala 2015-04-24 07:52:16 UTC
Statement:

This issue does not affect the version of 389-ds-base package as shipped with Red Hat Enterprise Linux 6.

Comment 11 Simo Sorce 2015-04-24 18:00:51 UTC
I think Noriko is better suited to answer questions about embargo lifting.

Comment 15 errata-xmlrpc 2015-04-28 18:18:29 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2015:0895 https://rhn.redhat.com/errata/RHSA-2015-0895.html

Comment 16 Ján Rusnačko 2015-04-28 18:26:50 UTC
Created 389-ds-base tracking bugs for this issue:

Affects: fedora-all [bug 1216203]


Note You need to log in before you can comment on or make changes to this bug.