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A flaw was found in libssh. By utilizing the ProxyCommand or ProxyJump feature, users can exploit unchecked hostname syntax on the client. This issue may allow an attacker to inject malicious code into the command of the features mentioned through the hostname parameter.

CVE-2023-6004 is a vulnerability identified in libssh, a widely used SSH library, affecting Red Hat Enterprise Linux 8. The flaw arises from improper neutralization of special elements in output that are subsequently processed by downstream components, specifically when using the ProxyCommand or ProxyJump features of SSH. These features allow users to specify commands or jump hosts to proxy SSH connections. The vulnerability stems from unchecked hostname syntax in these features, which can be manipulated by an attacker to inject malicious code into the command executed by ProxyCommand or ProxyJump. Exploitation requires the attacker to have limited privileges (local access with some rights) and user interaction, such as convincing a user to connect to a malicious host or supply a crafted hostname. The impact includes potential injection of arbitrary commands, which can lead to partial compromise of confidentiality, integrity, and availability of the affected system. The CVSS 3.1 base score is 4.8 (medium), reflecting the need for local privileges and user interaction, as well as limited impact scope. No known exploits have been reported in the wild as of the publication date. The vulnerability highlights the risks associated with insufficient input validation in SSH client features that handle complex command execution flows. Organizations using RHEL 8 with libssh should monitor for patches and consider restricting or auditing the use of ProxyCommand and ProxyJump to mitigate risk.

Detailed information about CVE-2023-6004: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') in Red Hat Red Hat 

CVE-2023-6004: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') in Red Hat Red Hat Enterprise Linux 8 - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2023-6004: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') in Red Hat Red Hat Enterprise Linux 8

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