Vulnerability Note VU#670568

Samba creates temporary files insecurely

Overview

Samba handles temporary files insecurely, allowing arbitrary files to be overwritten and left in a state that would permit later modification.

I. Description

Samba is an implementation of the Server Message Block (SMB) protocol. Some versions of samba handle temporary files in an insecure manner that may allow local users to cause arbitrary files and devices to be overwritten. Due to easily predictable printer queue cache file names, local users may create symbolic links to any file or device causing it to be corrupted when a remote user accesses a printer. In addition, the file will be left with world-writable permissions, allowing any user to enter their own data.

II. Impact

By modifying arbitrary files, an attacker may gain elevated priveleges. By corrupting files or devices, an attacker may cause denial of service.

III. Solution

Apply vendor patches; see the Systems Affected section below.

Deinstall the Samba package.

Systems Affected

Vendor	Status	Date Notified
Caldera	Vulnerable	1-Aug-2001
Conectiva	Vulnerable	1-Aug-2001
Debian	Vulnerable	1-Aug-2001
FreeBSD	Vulnerable	21-Aug-2001
MandrakeSoft	Vulnerable	1-Aug-2001
Progency Linux Systems	Vulnerable	1-Aug-2001
RedHat	Vulnerable	21-Aug-2001
Samba Team	Vulnerable	1-Aug-2001
Trustix	Vulnerable	17-Sep-2001

References

Credit

This vulnerability was first reported by Marcus Meissner of Caldera.

This document was last modified by Tim Shimeall.

Other Information

Date Public:	2001-04-23
Date First Published:	2001-09-17
Date Last Updated:	2001-09-17
CERT Advisory:
CVE-ID(s):	CAN-2001-0406
NVD-ID(s):	CAN-2001-0406
US-CERT Technical Alerts:
Severity Metric:	13.36
Document Revision:	7

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