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Bug 1918636

Summary:	username enumeration from kinit in WebUI
Product:	Red Hat Enterprise Linux 8	Reporter:	Thorsten Scherf <tscherf>
Component:	ipa	Assignee:	Thomas Woerner <twoerner>
Status:	CLOSED NOTABUG	QA Contact:	ipa-qe <ipa-qe>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	8.4	CC:	cbuissar, ftrivino, mpanaous, pvoborni, rcritten, tscherf
Target Milestone:	rc	Keywords:	Desktop, Triaged
Target Release:	8.0	Flags:	pm-rhel: mirror+
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2022-05-10 07:56:50 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Thorsten Scherf 2021-01-21 09:37:37 UTC

Description of problem:
t is possible to enumerate users in Web UI using the login function. The response from the
server when trying to log in as existing user is different than after using a non-existing
username.

Below you can find response for non-existing username.

Response:
HTTP/1.1 401 Unauthorized
Date: Wed, 02 Dec 2020 12:41:57 GMT
23
CONFIDENTIAL
Server: Apache
X-IPA-Rejection-Reason: invalid-password
Strict-Transport-Security: max-age=63072000; includeSubDomains
X-Frame-Options: DENY
Content-Security-Policy: frame-ancestors 'none'
Cache-Control: no-cache, private
X-Content-Type-Options: nosniff
X-XSS-Protection: 1; mode=block
Content-Length: 246
Connection: close
Content-Type: text/html; charset=utf-8
<html>
<head>
<title>401 Unauthorized</title>
</head>
<body>
<h1>Invalid Authentication</h1>
<p>
<strong>kinit: Client 'testtest@$example_domain.com' not found in Kerberos database while getting initial credentials
</strong>
</p>
</body>
</html> 


Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1.
2.
3.

Actual results:


Expected results:
No exposure of valid usernames through the WebUI.

Additional info:

Comment 10 Trivino 2022-05-10 07:56:50 UTC

Attaching upstream ticket: https://pagure.io/freeipa/issue/9114

After evaluating this BZ, the behavior is the same for Kerberos protocol and all KDC implementations. Changing a message response over Web UI does not prevent all points to access it and, most importantly, does not solve the problem.