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Category:   Application (File Transfer/Sharing)  >   Samba Vendors:   Samba.org
Samba Winbind SFU/RFC2307 GID Error Lets Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1018681
SecurityTracker URL:  http://securitytracker.com/id/1018681
CVE Reference:   CVE-2007-4138   (Links to External Site)
Date:  Sep 11 2007
Impact:   Root access via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 3.0.25 - 3.0.25c
Description:   A vulnerability was reported in Samba. A local user can obtain elevated privileges on the target system in a certain configuration.

When the 'winbind nss info' parameter in 'smb.conf' is set to 'sfu' or 'rfc2307' (allowing the 'idmap_ad.so' library to retrieve certain user data from an Active Directory domain controller), the user's primary group ID (gid) is set to 0 in certain cases. If the RFC2307 or Services or Unix (SFU) primary group attributes are not specified, this error will occur.

The vendor was notified on August 29, 2007.

Rick King reported this vulnerability.

Impact:   A local user may be assigned elevated group id (gid) privileges on the target system.
Solution:   The vendor has issued a fixed version (3.0.26). A patch is also available at:

http://www.samba.org/samba/security/

The Samba advisory is available at:

http://samba.org/samba/security/CVE-2007-4138.html

Vendor URL:  samba.org/samba/security/CVE-2007-4138.html (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Nov 15 2007 (Red Hat Issues Fix) Samba Winbind SFU/RFC2307 GID Error Lets Local Users Gain Elevated Privileges
Red Hat has released a fix for Red Hat Enterprise Linux 4.
Nov 16 2007 (Red Hat Issues Fix) Samba Winbind SFU/RFC2307 GID Error Lets Local Users Gain Elevated Privileges
Red Hat has released a fix for Red Hat Enterprise Linux 5.



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