Bug 1108748 (CVE-2014-3493)

Summary:	CVE-2014-3493 samba: smbd unicode path names denial of service
Product:	[Other] Security Response	Reporter:	Stefan Cornelius <scorneli>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	aavati, asn, gdeschner, jrusnack, mjc, nlevinki, rfortier, sbose, security-response-team, ssaha, vbellur
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	It was discovered that smbd, the Samba file server daemon, did not properly handle certain files that were stored on the disk and used a valid Unicode character in the file name. An attacker able to send an authenticated non-Unicode request that attempted to read such a file could cause smbd to crash.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2014-08-12 16:49:18 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:	1108840, 1108841, 1108842, 1108843, 1108844, 1108845, 1112150, 1112151, 1112251
Bug Blocks:	1098221

Description Stefan Cornelius 2014-06-12 13:59:28 UTC

It was discovered that smbd, the Samba file server deamon, did not properly handle certain valid on-disk unicode path names if an authenticated client tries to read them via a non-unicode request.

In case the push_ascii() function encounters an error, e.g. a conversion failure, its error return value may incorrectly be used as a pointer in subsequent memory writes, leading to a crash or possible memory corruption. 

Acknowledgments:

Red Hat would like to thank the Samba project for reporting this issue. The Samba project acknowledges Simon Arlott as the original reporter.

Comment 7 Stefan Cornelius 2014-06-23 12:21:38 UTC

Public now.

External Reference:

http://www.samba.org/samba/security/CVE-2014-3493

Comment 8 Stefan Cornelius 2014-06-23 12:26:25 UTC

Created samba tracking bugs for this issue:

Affects: fedora-all [bug 1112251]

Comment 9 Stefan Cornelius 2014-07-02 09:19:27 UTC

Statement:

This issue affects the versions of samba3x as shipped with Red Hat Enterprise Linux 5. This issue affects the versions of samba and samba4 as shipped with Red Hat Enterprise Linux 6. This issue affects the versions of samba as shipped with Red Hat Enterprise Linux 7. This issue did not affect the versions of samba as shipped with Red Hat Enterprise Linux 5.

Comment 10 Martin Prpič 2014-07-08 12:53:06 UTC

IssueDescription:

It was discovered that smbd, the Samba file server daemon, did not properly handle certain files that were stored on the disk and used a valid Unicode character in the file name. An attacker able to send an authenticated non-Unicode request that attempted to read such a file could cause smbd to crash.

Comment 11 errata-xmlrpc 2014-07-09 16:18:47 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 7

Via RHSA-2014:0867 https://rhn.redhat.com/errata/RHSA-2014-0867.html

Comment 12 errata-xmlrpc 2014-07-09 16:29:38 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 6
  Red Hat Enterprise Linux 5

Via RHSA-2014:0866 https://rhn.redhat.com/errata/RHSA-2014-0866.html

Comment 14 Stefan Cornelius 2014-08-12 16:49:18 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2014:1009 https://rhn.redhat.com/errata/RHSA-2014-1009.html