CERT/CC Vulnerability Note VU#268336

Overview

Samba fails to properly filter input to /bin/sh. This vulnerability may allow a remote, authenticated attacker to execute arbitrary code on a Samba server.

Description

Samba provides file and print services for Microsoft Windows, Unix, Linux, and OS X clients. Samba can also act as a Primary Domain Controller (PDC) or as a Domain Member. Samba runs on most Unix-like systems.

Samba versions prior to 3.0.24 pass unchecked user input from RPC messages to /bin/sh when calling externals scripts that are listed in the Samba configuration file. An attacker may be able to exploit this vulnerability by sending specially crafted RPC messages to a vulnerable server.

This vulnerability occurred as a result of failing to comply with recommndation STR02-C of the CERT C Programming Language Secure Coding Standard.

Impact

A remote, unauthenticated attacker may be able to execute arbitrary commands.

Solution

Apply a patch or upgrade
These vulnerabilities are addressed in Samba version 3.0.25. In addition, patches are available to address this vulnerability in Samba version 3.0.24. Refer to the Samba Security Releases website for more information.

Do not load external shell scripts

From the CVE-2007-2447 entry on the Samba security page:

This defect may be alleviated by removing all defined external script invocations (username map script, add printer command, etc...) from smb.conf.

Restrict access

Limiting access to the Samba server to trusted hosts may mitigate this vulnerability.

Vendor Information

268336

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Apple Computer, Inc. Affected

Notified: May 14, 2007 Updated: July 30, 2007

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Debian GNU/Linux Affected

Notified: May 14, 2007 Updated: July 30, 2007

Status

Affected

Vendor Statement

These problems have been fixed in Debian GNU/Linux 4.0 with version 3.0.24-6etch1 via Debian Security Advisory 1291 as in

<http://www.debian.org/security/2007/dsa-1291>

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Gentoo Linux Affected

Notified: May 14, 2007 Updated: May 16, 2007

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Red Hat, Inc. Affected

Notified: May 14, 2007 Updated: May 15, 2007

Status

Affected

Vendor Statement

This issue affected the Samba package as shipped with Red Hat Enterprise Linux 2.1, 4, 4, and 5. Updated packages to correct this issue are available along with our advisories at the URLs below and via Red Hat Network.

http://rhn.redhat.com/errata/RHSA-2007-0354.html

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Samba Affected

Updated: May 14, 2007

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

See http://samba.org/samba/security/CVE-2007-2447.html for more details.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Slackware Linux Inc. Affected

Notified: May 14, 2007 Updated: May 16, 2007

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Sun Microsystems, Inc. Affected

Notified: May 14, 2007 Updated: May 15, 2007

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Ubuntu Affected

Notified: May 14, 2007 Updated: May 16, 2007

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

See http://www.ubuntu.com/usn/usn-460-1 for more details.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Novell, Inc. Not Affected

Notified: May 14, 2007 Updated: June 01, 2007

Status

Not Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Conectiva Inc. Unknown

Notified: May 14, 2007 Updated: May 14, 2007

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Cray Inc. Unknown

Notified: May 14, 2007 Updated: May 14, 2007

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

EMC, Inc. (formerly Data General Corporation) Unknown

Notified: May 14, 2007 Updated: May 14, 2007

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Engarde Secure Linux Unknown

Notified: May 14, 2007 Updated: May 14, 2007

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

F5 Networks, Inc. Unknown

Notified: May 14, 2007 Updated: May 14, 2007

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Fedora Project Unknown

Notified: May 14, 2007 Updated: May 14, 2007

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

FreeBSD, Inc. Unknown

Notified: May 14, 2007 Updated: May 14, 2007

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Fujitsu Unknown

Notified: May 14, 2007 Updated: May 14, 2007

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Hewlett-Packard Company Unknown

Notified: May 14, 2007 Updated: May 14, 2007

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Hitachi Unknown

Notified: May 14, 2007 Updated: May 14, 2007

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

IBM Corporation Unknown

Notified: May 14, 2007 Updated: May 14, 2007

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

IBM Corporation (zseries) Unknown

Notified: May 14, 2007 Updated: May 14, 2007

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

IBM eServer Unknown

Notified: May 14, 2007 Updated: May 14, 2007

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Immunix Communications, Inc. Unknown

Notified: May 14, 2007 Updated: May 14, 2007

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Ingrian Networks, Inc. Unknown

Notified: May 14, 2007 Updated: May 14, 2007

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Juniper Networks, Inc. Unknown

Notified: May 14, 2007 Updated: May 14, 2007

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Mandriva, Inc. Unknown

Notified: May 14, 2007 Updated: May 14, 2007

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Microsoft Corporation Unknown

Notified: May 14, 2007 Updated: May 14, 2007

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

MontaVista Software, Inc. Unknown

Notified: May 14, 2007 Updated: May 14, 2007

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

NEC Corporation Unknown

Notified: May 14, 2007 Updated: May 14, 2007

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

NetBSD Unknown

Notified: May 14, 2007 Updated: May 14, 2007

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Nokia Unknown

Notified: May 14, 2007 Updated: May 14, 2007

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

OpenBSD Unknown

Notified: May 14, 2007 Updated: May 14, 2007

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Openwall GNU/*/Linux Unknown

Notified: May 14, 2007 Updated: May 14, 2007

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

QNX, Software Systems, Inc. Unknown

Notified: May 14, 2007 Updated: May 14, 2007

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

SUSE Linux Unknown

Notified: May 14, 2007 Updated: May 14, 2007

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Silicon Graphics, Inc. Unknown

Notified: May 14, 2007 Updated: May 14, 2007

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Sony Corporation Unknown

Notified: May 14, 2007 Updated: May 14, 2007

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

The SCO Group Unknown

Notified: May 14, 2007 Updated: May 14, 2007

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Trustix Secure Linux Unknown

Notified: May 14, 2007 Updated: May 14, 2007

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Turbolinux Unknown

Notified: May 14, 2007 Updated: May 14, 2007

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Unisys Unknown

Notified: May 14, 2007 Updated: May 14, 2007

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Wind River Systems, Inc. Unknown

Notified: May 14, 2007 Updated: May 14, 2007

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

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CVSS Metrics

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References

Acknowledgements

Thanks to Joshua J. Drake, iDefense Labs, and the Samba team for information that was used in this report.

This document was written by Ryan Giobbi.

Other Information

CVE IDs:	CVE-2007-2447
Severity Metric:	7.44
Date Public:	2007-05-14
Date First Published:	2007-05-14
Date Last Updated:	2008-07-21 17:51 UTC
Document Revision:	42

Software Engineering Institute

CERT Coordination Center

Samba command injection vulnerability

Vulnerability Note VU#268336

Overview

Description

Impact

Solution

Vendor Information

Apple Computer, Inc. Affected

Status

Vendor Statement

Vendor Information

Debian GNU/Linux Affected

Status

Vendor Statement

Vendor Information

Gentoo Linux Affected

Status

Vendor Statement

Vendor Information

Red Hat, Inc. Affected

Status

Vendor Statement

Vendor Information

Samba Affected

Status

Vendor Statement

Vendor Information

Addendum

Slackware Linux Inc. Affected

Status

Vendor Statement

Vendor Information

Sun Microsystems, Inc. Affected

Status

Vendor Statement

Vendor Information

Ubuntu Affected

Status

Vendor Statement

Vendor Information

Addendum

Novell, Inc. Not Affected

Status

Vendor Statement

Vendor Information

Conectiva Inc. Unknown

Status

Vendor Statement

Vendor Information

Cray Inc. Unknown

Status

Vendor Statement

Vendor Information

EMC, Inc. (formerly Data General Corporation) Unknown

Status

Vendor Statement

Vendor Information

Engarde Secure Linux Unknown

Status

Vendor Statement

Vendor Information

F5 Networks, Inc. Unknown

Status

Vendor Statement

Vendor Information

Fedora Project Unknown

Status

Vendor Statement

Vendor Information

FreeBSD, Inc. Unknown

Status

Vendor Statement

Vendor Information

Fujitsu Unknown

Status

Vendor Statement

Vendor Information

Hewlett-Packard Company Unknown