Vulnerabilities > CVE-2023-3603 - NULL Pointer Dereference vulnerability in Libssh

CVSS 6.5 - MEDIUM

Attack vector

NETWORK

Attack complexity

LOW

Privileges required

LOW

Confidentiality impact

NONE

Integrity impact

NONE

Availability impact

HIGH

network

low complexity

libssh

CWE-476

NVD

Published: 2023-07-21

Updated: 2024-05-23

Summary

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.

Vulnerable Configurations

Part	Description	Count
Application	Libssh Libssh Libssh - Libssh Libssh 0.4.7 Libssh Libssh 0.4.8 Libssh Libssh 0.5.0 Libssh Libssh 0.5.1 Libssh Libssh 0.5.2 Libssh Libssh 0.5.3 Libssh Libssh 0.5.4 Libssh Libssh 0.5.5 Libssh Libssh 0.6.0 Libssh Libssh 0.6.1 Libssh Libssh 0.6.2 Libssh Libssh 0.6.3 Libssh Libssh 0.6.4 Libssh Libssh 0.6.5 Libssh Libssh 0.7.0 Libssh Libssh 0.7.1 Libssh Libssh 0.7.2 Libssh Libssh 0.7.3 Libssh Libssh 0.7.4 Libssh Libssh 0.7.5 Libssh Libssh 0.7.6 Libssh Libssh 0.7.7 Libssh Libssh 0.8.0 Libssh Libssh 0.8.1 Libssh Libssh 0.8.2 Libssh Libssh 0.8.3 Libssh Libssh 0.8.4 Libssh Libssh 0.8.5 Libssh Libssh 0.8.6 Libssh Libssh 0.8.7 Libssh Libssh 0.8.8	33

Common Weakness Enumeration (CWE)

CWE-476 - NULL Pointer Dereference

Summary

Vulnerable Configurations

Common Weakness Enumeration (CWE)

References