== Subject: Uninitialized read of a data value
== CVE ID#: CVE-2009-1888
== Versions: Samba 3.0.31 - 3.3.5
== Summary: In Samba 3.0.31 to 3.3.5 (inclusive), an
== uninitialized read of a data value can potentially
== affect access control when "dos filemode"
== is set to "yes".
The smbd daemon in Samba 3.0.31 - 3.3.5 contains an
uninitialized read of a data value that can potentially
affect access control. If a user is trying to modify
an access control list (ACL) and is denied permission,
this deny may be overridden if the parameter "dos filemode"
is set to "yes" in the smb.conf and the user already has write
access to the file. The error occurs in checking that the
user has write access. Uninitialized memory is read instead
of the values in the 'stat' struct of the file.
An attack would be difficult to script by an attacker,
as the attacker would need to find a reproducible case
to ensure previously used stack memory had the correct
values to trigger the bug. In addition, the server would
have to have been configured with "dos filemode = yes"
in the smb.conf.
A patch addressing this defect has been posted to
Additionally, Samba 3.2.13 and 3.0.35 and 3.3.6 have been issued
as security releases to correct the defect. Samba administrators are
advised to upgrade to these releases or apply the patch as soon
Set the parameter:
dos filemode = no
in the [global] section of your smb.conf. This is
already the default setting.
This issue was found by Jeremy Allison as part of
normal code auditing activities in Samba.
== Our Code, Our Bugs, Our Responsibility.
== The Samba Team
The acl_group_override function in smbd/posix_acls.c in smbd in Samba
3.0.x before 3.0.35, 3.1.x and 3.2.x before 3.2.13, and 3.3.x before
3.3.6, when dos filemode is enabled, allows remote attackers to
modify access control lists for files via vectors related to read
access to uninitialized memory.
+ 25 Jun 2009; Patrick Lauer <email@example.com> +samba-3.0.35.ebuild:
+ Bump to 3.0.35. Fixes #275236.
ping to @security to stabilize > net-fs/samba-3.0.35
Arches, please test and mark stable:
Target keywords : "alpha amd64 arm hppa ia64 ppc ppc64 s390 sh sparc x86"
Stable for HPPA.
Adjusting to C4, as "dos filemode = no" is the default & closing NOGLSA.
...and closing NOGLSA. ;)