Bug 1205752 – CVE-2015-2704 realmd: untrusted data is used when configuring sssd.conf and/or smb.conf

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Bug 1205752 - (CVE-2015-2704) CVE-2015-2704 realmd: untrusted data is used when configuring sssd.conf and/or smb.conf

Summary:	CVE-2015-2704 realmd: untrusted data is used when configuring sssd.conf and/o...

Status:	CLOSED ERRATA

Aliases:	CVE-2015-2704

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=moderate,public=20150218,repor...
Keywords:	Security

Depends On:	1205754 1233011
Blocks:	1205773 1210268
	Show dependency tree / graph

Reported:	2015-03-25 11:01 EDT by Vasyl Kaigorodov
Modified:	2015-11-23 07:42 EST (History)
CC List:	6 users (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:	A flaw was found in the way realmd parsed certain input when writing configuration into the sssd.conf or smb.conf file. A remote attacker could use this flaw to inject arbitrary configurations into these files via a newline character in an LDAP response.
Story Points:	---
Clone Of:
Environment:
Last Closed:	2015-11-20 00:59:17 EST
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
Validate text from LDAP (3.71 KB, patch) 2015-04-14 07:06 EDT, Stef Walter	no flags	Details \| Diff
Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2015:2184	normal	SHIPPED_LIVE	Moderate: realmd security, bug fix, and enhancement update	2015-11-19 02:51:28 EST

Groups: None (edit)

Description Vasyl Kaigorodov 2015-03-25 11:01:48 EDT

It was reported to upstream that realmd is using untrusted data when configuring sssd.conf and/or smb.conf:

https://bugs.freedesktop.org/show_bug.cgi?id=89207

No patches are available at the time of writing.

Comment 1 Stef Walter 2015-04-14 05:45:38 EDT

Commits available upstream.

Comment 2 Stef Walter 2015-04-14 06:31:20 EDT

Relevant commits:

commit 6d5ac47cc22c273a55bea89dffbe537a3c86ad2c
Author: Stef Walter <stefw@redhat.com>
Date:   Tue Apr 14 11:30:53 2015 +0200

    service: Limit the characters we read from LDAP
    
    We strictly limit this to characters expected in domain names.


commit 502980a8a17eddb5fe3d16bcad229a6d0ba11065
Author: Stef Walter <stefw@redhat.com>
Date:   Sat Apr 11 13:29:40 2015 +0200

    service: Only accept specific characters when parsing MSCLDAP response
    
    This provides an extra layer of protection against injecting
    odd characters into configuration files.

Comment 3 Stef Walter 2015-04-14 07:06:17 EDT

Created attachment 1014276 [details]
Validate text from LDAP

Combined patch for this issue.

Comment 5 Fedora Update System 2015-04-22 18:55:31 EDT

realmd-0.16.0-1.fc22 has been pushed to the Fedora 22 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 6 Fedora Update System 2015-05-08 03:41:54 EDT

realmd-0.15.2-2.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 10 errata-xmlrpc 2015-11-18 22:43:51 EST

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2015:2184 https://rhn.redhat.com/errata/RHSA-2015-2184.html

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