SCO OpenServer/UnixWare vi creates temporary files insecurely

2001-10-09T00:00:00
ID VU:747736
Type cert
Reporter CERT
Modified 2001-10-09T00:00:00

Description

Overview

The implementation of vi, a text editor, provided with SCO Openunix creates insecure temporary files with predictable names. Using a symbolic link attack, an intruder can overwrite any file writable by the user of vi.

Description

vi is a screen-oriented text editor. The implementation distributed with SCO Openunix creates temporary files in the world-writable directory /tmp with predictable names, and fails to check for prior ownership and protection of these files.


Impact

By creating symbolic links named for the files that vi creates, an intruder may overwrite any file writable by the user of vi. Since the intruder cannot control the content of the overwritten files, it does not seem likely that an increase in privilege will result.


Solution

Apply vendor patches; see the Systems Affected section below.


Systems Affected

Vendor| Status| Date Notified| Date Updated
---|---|---|---
SCO| | 18 Sep 2001| 20 Sep 2001
If you are a vendor and your product is affected, let us know.

CVSS Metrics

Group | Score | Vector
---|---|---
Base | N/A | N/A
Temporal | N/A | N/A
Environmental | N/A | N/A

References

  • <http://www.securityfocus.com/bid/2752>
  • <ftp://stage.caldera.com/pub/security/openserver/CSSA-2001-SCO.17/CSSA-2001-SCO.17.txt>

Credit

This vulnerability was first reported by Richard Johnson.

This document was last edited by Tim Shimeall

Other Information

  • CVE IDs: CAN-2001-0627
  • Date Public: 31 May 2001
  • Date First Published: 09 Oct 2001
  • Date Last Updated: 09 Oct 2001
  • Severity Metric: 1.01
  • Document Revision: 13