Bug 2221791 (CVE-2023-3603)

Summary: CVE-2023-3603 libssh: Processing SFTP server read may cause NULL dereference
Product: [Other] Security Response Reporter: Zack Miele <zmiele>
Component: vulnerabilityAssignee: Nobody <nobody>
Status: CLOSED WONTFIX QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: ansasaki, jjelen, mpitt, npocs
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A missing allocation check in sftp server processing read requests may cause a NULL dereference on low-memory conditions. The malicious client can request up to 4GB SFTP reads, causing allocation of up to 4GB buffers, which was not being checked for failure. This will likely crash the authenticated user's sftp server connection (if implemented as forking as recommended). For thread-based servers, this might also cause DoS for legitimate users. Given this code is not in any released versions, no security releases have been issued.
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Clone Of: Environment:
Last Closed: 2023-07-10 18:42:07 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2221775    

Description Zack Miele 2023-07-10 18:40:46 UTC 
Given this code is not in any released versions, no security release  has
been issued.

Missing allocation check in sftp server processing read requests may
cause NULL dereference on low-memory conditions. The malicious client
can request up to 4GB SFTP reads, causing allocation of up to 4GB buffers,
which is being unchecked for failure.

This will likely crash the authenticated user sftp server's connection
(if implemented as forking as we recommend). For thread-based
servers, this might cause DoS also for legitimate users.