Vandyke Software SecureCRT contains buffer overflow vulnerability in password handling code

2002-09-16T00:00:00
ID VU:216227
Type cert
Reporter CERT
Modified 2003-04-15T00:00:00

Description

Overview

SecureCRT is vulnerable to buffer overflow from improper handling of long password input.

Description

SecureCRT is a terminal emulator and SSH client for Windows. If the SSH1 protocol is used and the user enters a password 300 characters or more in length, SecureCRT will crash, with the following error displayed by Windows:

"SECURECRT caused an invalid page fault in module MSVCRT.DLL..."

Since the execution instruction pointer (EIP) register is not overwritten, the crash more likely results from heap overflow than stack overflow.

According to VanDyke Software, the vulnerability does not occur when the SSH2 protocol is used.


Impact

Local users may be able to execute arbitrary code on the client host by supplying a long password to SecureCRT.


Solution

The CERT/CC is currently unaware of a practical solution to this problem.


Systems Affected

Vendor| Status| Date Notified| Date Updated
---|---|---|---
VanDyke Software Inc.| | 29 Jan 2002| 06 Aug 2002
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.vandyke.com/products/securecrt>
  • <http://www.vandyke.com/products/securecrt/history.txt>

Credit

Thanks to Blackshell Security Advisory for reporting this vulnerability.

This document was written by Shawn Van Ittersum.

Other Information

  • CVE IDs: Unknown
  • Date Public: 30 Dec 2001
  • Date First Published: 16 Sep 2002
  • Date Last Updated: 15 Apr 2003
  • Severity Metric: 0.06
  • Document Revision: 9