CVE-2020-6923 in Linux Imaging and Printing Software
Summary
by MITRE • 12/19/2024
The HP Linux Imaging and Printing (HPLIP) software may potentially be affected by memory buffer overflow.
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Analysis
by VulDB Data Team • 02/17/2025
The CVE-2020-6923 vulnerability represents a critical memory buffer overflow flaw within the HP Linux Imaging and Printing (HPLIP) software suite that affects numerous Linux distributions. This vulnerability resides in the handling of printer configuration data and device communication protocols, specifically within the backend components responsible for processing printer-specific information. The issue manifests when the software processes malformed or oversized data structures during printer setup or communication initialization phases, creating potential attack vectors for malicious actors seeking to compromise systems running affected HPLIP versions.
The technical implementation of this buffer overflow vulnerability stems from inadequate input validation and bounds checking within the HPLIP software's printer communication modules. When the system receives printer configuration data or device identification information that exceeds predetermined buffer limits, the software fails to properly handle the overflow condition, leading to potential memory corruption. This flaw operates at the application layer and can be exploited through various attack vectors including malicious printer device enumeration, crafted printer configuration files, or network-based printer discovery protocols that leverage the vulnerable HPLIP components. The vulnerability is particularly concerning as it affects the core printing infrastructure that many Linux systems depend upon for device management and document processing.
The operational impact of CVE-2020-6923 extends beyond simple system instability, potentially enabling remote code execution or privilege escalation attacks depending on the system configuration and execution context. Attackers could leverage this vulnerability to execute arbitrary code with the privileges of the HPLIP service or user account, potentially leading to full system compromise. The vulnerability affects systems where HPLIP is installed and actively managing printer devices, particularly those in enterprise environments where multiple printers are configured and managed through the HPLIP framework. Organizations relying on automated printer discovery or network-based printing solutions face heightened risk as these functionalities often trigger the vulnerable code paths during normal operation.
Security practitioners should implement immediate mitigation strategies including updating to the latest HPLIP versions that contain patched buffer handling routines and disabling unnecessary printer services when not actively required. The vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and potentially CWE-122, heap-based buffer overflow scenarios that may also apply to the memory management patterns within the affected software. From an ATT&CK framework perspective, this vulnerability maps to techniques involving privilege escalation and execution through legitimate system tools, with potential TTPs including 'Exploitation for Privilege Escalation' and 'System Binary Proxy Execution' when attackers leverage compromised printing services for broader system access. Organizations should conduct comprehensive vulnerability assessments across their printer infrastructure and consider implementing network segmentation to limit exposure of systems running vulnerable HPLIP components.