Bug 1477669 (CVE-2017-7551)

Summary:	CVE-2017-7551 389-ds-base: Password brute-force possible for locked account due to different return codes
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	edewata, mreynolds, nhosoi, nkinder, rmeggins, tmihinto
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in the way 389-ds-base handled authentication attempts against locked accounts. A remote attacker could potentially use this flaw to continue password brute-forcing attacks against LDAP accounts, thereby bypassing the protection offered by the directory server's password lockout policy.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-03-03 12:01:45 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1476958, 1477674, 1478045, 1482425, 1482426
Bug Blocks:	1477671

Description Adam Mariš 2017-08-02 15:27:02 UTC

The directory server password lockout policy prevents binds from operating once a threshold of failed passwords has been met. If attacker during this lockout binds with the correct password, a different error code is returned. This means that attacker has no ratelimit or penalty during the account lock, and can continue to attempt passwords via bruteforce.

Upstream bug:

https://pagure.io/389-ds-base/issue/49336

Upstream patch:

https://pagure.io/389-ds-base/c/33db32a3e14b849d

Comment 1 Adam Mariš 2017-08-02 15:30:57 UTC

Created 389-ds-base tracking bugs for this issue:

Affects: fedora-all [bug 1477674]

Comment 5 errata-xmlrpc 2017-09-05 11:23:57 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:2569 https://access.redhat.com/errata/RHSA-2017:2569