Samba Insecure TMP file Symbolic Link Vulnerability

BID:2617

Info

Samba Insecure TMP file Symbolic Link Vulnerability

Bugtraq ID: 2617
Class: Access Validation Error
CVE:
Remote: No
Local: Yes
Published: Apr 17 2001 12:00AM
Updated: Apr 17 2001 12:00AM
Credit: This vulnerability was originally discovered by Marcus Meissner <[email protected]>, and was announced to Bugtraq by Tridge <[email protected]> on April 17, 2001.
Vulnerable: Samba Samba 2.0.8
- Caldera OpenLinux 2.4
- Caldera OpenLinux 2.4
- Debian Linux 2.2 sparc
 - Debian Linux 2.2 sparc
 - Debian Linux 2.2 powerpc
 - Debian Linux 2.2 powerpc
 - Debian Linux 2.2 arm
 - Debian Linux 2.2 arm
 - Debian Linux 2.2 alpha
 - Debian Linux 2.2 alpha
 - Debian Linux 2.2 68k
 - Debian Linux 2.2 68k
 - Debian Linux 2.2
- Debian Linux 2.2
- Redhat Linux 7.1 i386
 - Redhat Linux 7.1 i386
 - Redhat Linux 7.1 alpha
 - Redhat Linux 7.0 i386
 - Redhat Linux 7.0 i386
 - Redhat Linux 7.0 alpha
 - Redhat Linux 7.0 alpha
 - Redhat Linux 6.2 sparc
 - Redhat Linux 6.2 sparc
 - Redhat Linux 6.2 i386
 - Redhat Linux 6.2 i386
 - Redhat Linux 6.2 alpha
 - Redhat Linux 6.2 alpha
 - Redhat Linux 5.2 sparc
 - Redhat Linux 5.2 sparc
 - Redhat Linux 5.2 i386
 - Redhat Linux 5.2 i386
 - Redhat Linux 5.2 alpha
 - Redhat Linux 5.2 alpha
 - SCO eDesktop 2.4
- SCO eDesktop 2.4
- SCO eServer 2.3.1
- SCO eServer 2.3.1
- Sun Solaris 8_x86
 - Sun Solaris 8_x86
 - Sun Solaris 8_sparc
 - Sun Solaris 8_sparc
 - Sun Solaris 7.0_x86
 - Sun Solaris 7.0_x86
 - Sun Solaris 7.0
 - Sun Solaris 7.0
 - SuSE Linux 7.1
- SuSE Linux 7.1
- SuSE Linux 7.0
- SuSE Linux 7.0
- SuSE Linux 6.4
- SuSE Linux 6.4
- Wirex Immunix OS 7.0 -Beta
 - Wirex Immunix OS 7.0 -Beta
 - Wirex Immunix OS 7.0
- Wirex Immunix OS 7.0
- Wirex Immunix OS 6.2
- Wirex Immunix OS 6.2
Samba Samba 2.0.7
+ Caldera OpenLinux 2.3
+ Caldera OpenLinux 2.3
+ Debian Linux 2.3 sparc
 + Debian Linux 2.3 sparc
 + Debian Linux 2.3 powerpc
 + Debian Linux 2.3 powerpc
 + Debian Linux 2.3 alpha
 + Debian Linux 2.3 alpha
 + Debian Linux 2.3
+ Debian Linux 2.3
+ Debian Linux 2.2 sparc
 + Debian Linux 2.2 sparc
 + Debian Linux 2.2 powerpc
 + Debian Linux 2.2 powerpc
 + Debian Linux 2.2 arm
 + Debian Linux 2.2 arm
 + Debian Linux 2.2 alpha
 + Debian Linux 2.2 alpha
 + Debian Linux 2.2 68k
 + Debian Linux 2.2 68k
 + Debian Linux 2.2
+ Debian Linux 2.2
- FreeBSD FreeBSD 5.0
- FreeBSD FreeBSD 5.0
- FreeBSD FreeBSD 4.2
- FreeBSD FreeBSD 4.2
+ Mandriva Linux Mandrake 7.1
+ Mandriva Linux Mandrake 7.1
+ Mandriva Linux Mandrake 7.0
+ Mandriva Linux Mandrake 7.0
+ Progeny Debian 1.0
+ Progeny Debian 1.0
+ Redhat Linux 7.1 i686
 + Redhat Linux 7.1 i686
 + Redhat Linux 7.1 i586
 + Redhat Linux 7.1 i586
 + Redhat Linux 7.1 i386
 + Redhat Linux 7.1 i386
 + Redhat Linux 7.1
+ Redhat Linux 7.1
+ Redhat Linux 7.0 i686
 + Redhat Linux 7.0 i686
 + Redhat Linux 7.0 i386
 + Redhat Linux 7.0 i386
 + Redhat Linux 7.0
+ Redhat Linux 7.0
+ Redhat Linux 6.2 E sparc
 + Redhat Linux 6.2 E i386
 + Redhat Linux 6.2 E alpha
 + Redhat Linux 6.2 sparc
 + Redhat Linux 6.2 i386
 + Redhat Linux 6.2 alpha
 + Redhat Linux 6.1 sparc
 + Redhat Linux 6.1 i386
 + Redhat Linux 6.1 alpha
 + SCO eDesktop 2.4
+ SCO eDesktop 2.4
+ SCO eServer 2.3.1
+ SCO eServer 2.3.1
+ Sun Cobalt Qube3 4000WG
+ Sun Cobalt Qube3 4000WG
+ Sun Cobalt RaQ 550 4100R
+ Sun Cobalt RaQ 550 4100R
+ Sun Cobalt RaQ XTR 3500R
+ Sun Cobalt RaQ XTR 3500R
+ Trustix Secure Linux 1.2
+ Trustix Secure Linux 1.2
+ Trustix Secure Linux 1.1
+ Trustix Secure Linux 1.1
+ Wirex Immunix OS 7.0 -Beta
 + Wirex Immunix OS 7.0 -Beta
 + Wirex Immunix OS 7.0
+ Wirex Immunix OS 7.0
+ Wirex Immunix OS 6.2
+ Wirex Immunix OS 6.2
Samba Samba 2.0.6
+ Redhat Linux 6.2 sparcv9
 + Redhat Linux 6.2 sparcv9
 + Redhat Linux 6.2 E sparc
 + Redhat Linux 6.2 E sparc
 + Redhat Linux 6.2 E i386
 + Redhat Linux 6.2 E i386
 + Redhat Linux 6.2 E alpha
 + Redhat Linux 6.2 E alpha
 + Redhat Linux 6.2 sparc
 + Redhat Linux 6.2 sparc
 + Redhat Linux 6.2 i386
 + Redhat Linux 6.2 i386
 + Redhat Linux 6.2 alpha
 + Redhat Linux 6.2 alpha
 + Redhat Linux 6.2
 + Redhat Linux 6.2
 + Sun Cobalt RaQ4 3001R
Samba Samba 2.0.5
- Caldera OpenLinux 2.3
- Caldera OpenLinux 2.3
- SCO eServer 2.3.1
Samba Samba 2.0.4
+ Debian Linux 2.1
+ Redhat Linux 6.0
+ Redhat Linux 6.0
+ Redhat Linux 5.2 i386
 + Redhat Linux 5.2 i386
 + Redhat Linux 4.2
+ Redhat Linux 4.2
HP CIFS/9000 Server A.01.06
- HP HP-UX 11.11
- HP HP-UX 11.0
Not Vulnerable: Samba Samba 2.2 .0
- SuSE Linux 7.2
Samba Samba 2.0.9
- Apple Mac OS X 10.0.4
- Apple Mac OS X 10.0.4
- Apple Mac OS X Server 10.0
- Apple Mac OS X Server 10.0
- Caldera OpenLinux Server 3.1
- Caldera OpenLinux Workstation 3.1
- Caldera OpenLinux Workstation 3.1
- Debian Linux 2.2
- Debian Linux 2.2
- Redhat Linux 7.1
- Redhat Linux 7.1
- Redhat Linux 7.0
- Redhat Linux 7.0
- Redhat Linux 6.2
 - Redhat Linux 6.2
 - Sun Solaris 8_x86
 - Sun Solaris 8_x86
 - Sun Solaris 8_sparc
 - Sun Solaris 8_sparc
 - Sun Solaris 7.0_x86
 - Sun Solaris 7.0_x86
 - Sun Solaris 7.0
 - Sun Solaris 7.0
 - SuSE Linux 7.1 sparc
 - SuSE Linux 7.1 sparc
 - SuSE Linux 7.1 ppc
 - SuSE Linux 7.1 ppc
 - SuSE Linux 7.1 alpha
 - SuSE Linux 7.1 alpha
 - SuSE Linux 7.1
- SuSE Linux 7.1
- SuSE Linux 7.0 sparc
 - SuSE Linux 7.0 sparc
 - SuSE Linux 7.0 ppc
 - SuSE Linux 7.0 ppc
 - SuSE Linux 7.0 alpha
 - SuSE Linux 7.0 alpha
 - SuSE Linux 7.0
- SuSE Linux 7.0
- SuSE Linux 6.4 ppc
 - SuSE Linux 6.4 ppc
 - SuSE Linux 6.4 alpha
 - SuSE Linux 6.4 alpha
 - SuSE Linux 6.4
- SuSE Linux 6.4
- SuSE Linux 6.3 alpha
 - SuSE Linux 6.3 alpha
 - SuSE Linux 6.3
- SuSE Linux 6.3
- Trustix Secure Linux 1.2
- Trustix Secure Linux 1.2
- Trustix Secure Linux 1.1
- Trustix Secure Linux 1.1
- Wirex Immunix OS 7.0 -Beta
 - Wirex Immunix OS 7.0 -Beta
 - Wirex Immunix OS 7.0
- Wirex Immunix OS 7.0
- Wirex Immunix OS 6.2
- Wirex Immunix OS 6.2

Discussion

Samba Insecure TMP file Symbolic Link Vulnerability

Samba is a flexible file sharing packaged maintained by the Samba development group. It provides interoperatability between UNIX and Microsoft Windows systems, permitting the sharing of files and printing services.

A problem in the package could make it possible to deny service to legitimate users. Due to the insecure creation of files in the /tmp file system, it is possible for a user to create a symbolic link to other files owned by privileged users in the system, such as system device files, and write data to the files.

This vulnerability makes it possible for a local user to deny service to other users of the system, and potentially gain elevated privileges.

Exploit / POC

Samba Insecure TMP file Symbolic Link Vulnerability

Gabriel Maggiotti <[email protected]> has provided the following exploit:

Solution / Fix

Samba Insecure TMP file Symbolic Link Vulnerability

Solution:
Available fixes:


HP CIFS/9000 Server A.01.06

Samba Samba 2.0.4

Samba Samba 2.0.5

Samba Samba 2.0.6

Samba Samba 2.0.7

Samba Samba 2.0.8

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