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Bug 1108748 - (CVE-2014-3493) CVE-2014-3493 samba: smbd unicode path names denial of service
CVE-2014-3493 samba: smbd unicode path names denial of service
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
low Severity low
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Assigned To: Red Hat Product Security
impact=low,public=20140623,reported=2...
: Security
Depends On: 1108842 1108840 1108841 1108843 1108844 1108845 1112150 1112151 1112251
Blocks: 1098221
  Show dependency tree / graph
 
Reported: 2014-06-12 09:59 EDT by Stefan Cornelius
Modified: 2014-11-07 10:02 EST (History)
11 users (show)

See Also:
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.
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Clone Of:
Environment:
Last Closed: 2014-08-12 12:49:18 EDT
Type: ---
Regression: ---
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Documentation: ---
CRM:
Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2014:0866 normal SHIPPED_LIVE Moderate: samba and samba3x security update 2014-07-09 16:27:55 EDT
Red Hat Product Errata RHSA-2014:0867 normal SHIPPED_LIVE Moderate: samba security update 2014-07-09 16:17:12 EDT

  None (edit)
Description Stefan Cornelius 2014-06-12 09:59:28 EDT 
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 08:21:38 EDT 
Public now.

External Reference:

http://www.samba.org/samba/security/CVE-2014-3493
Comment 8 Stefan Cornelius 2014-06-23 08:26:25 EDT 
Created samba tracking bugs for this issue:

Affects: fedora-all [bug 1112251]
Comment 9 Stefan Cornelius 2014-07-02 05:19:27 EDT 
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 08:53:06 EDT 
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 12:18:47 EDT 
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 12:29:38 EDT 
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 12:49:18 EDT 
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
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