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Category:   Application (Security)  >   Bitvise SSH Server Vendors:   Bitvise
Bitvise SSH Server Invalid Memory Access and zlib Compression Library Flaws Let Remote Authenticated Users Cause the Target Service to Crash
SecurityTracker Alert ID:  1040945
SecurityTracker URL:  http://securitytracker.com/id/1040945
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  May 19 2018
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 7.41
Description:   Several vulnerabilities were reported in Bitvise SSH Server. A remote authenticated user can cause the target service to crash.

A remote authenticated user can send specially crafted data to trigger an invalid memory access error and cause the target SSH service to stop processing.

Systems running on 32-bit versions of Windows are affected.

A remote authenticated user authorized to use the SFTP subsystem and send specially crafted data to trigger an invalid memory access error and cause the target SFTP subsystem to stop processing and potentially fail to log the user's most recent actions.

A remote authenticated user can import a specially crafted file via either the local or remote the Bitvise SSH Server Control Panel to cause the import process to stop processing.

A remote authenticated user can trigger a race condition in a zlib compression library component to corrupt decompressed data in a different user's session.

Impact:   A remote authenticated user can cause the target service to crash.
Solution:   The vendor has issued a fix (7.41) [in April 2018].

A fix for the invalid memory access error is also available for version 6.x (6.51).

The vendor advisory is available at:

https://www.bitvise.com/ssh-server-version-history#security-notification-741

Vendor URL:  www.bitvise.com/ssh-server-version-history#security-notification-741 (Links to External Site)
Cause:   Access control error, State error
Underlying OS:  Windows (Any)

Message History:   None.


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