CVE-2022-23219 in Fujitsu M10-1
Summary
by MITRE • 01/14/2022
The deprecated compatibility function clnt_create in the sunrpc module of the GNU C Library (aka glibc) through 2.34 copies its hostname argument on the stack without validating its length, which may result in a buffer overflow, potentially resulting in a denial of service or (if an application is not built with a stack protector enabled) arbitrary code execution.
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Analysis
by VulDB Data Team • 04/30/2026
The vulnerability identified as CVE-2022-23219 resides within the GNU C Library's deprecated compatibility function clnt_create located in the sunrpc module. This function serves as a legacy interface for creating client connections to remote procedure call services, representing a critical security flaw that has persisted through glibc versions up to 2.34. The issue stems from improper input validation mechanisms that fail to enforce length constraints on the hostname parameter, creating an exploitable condition that affects systems relying on this deprecated functionality.
The technical implementation flaw manifests when the clnt_create function processes hostname arguments without performing adequate bounds checking or length validation. This oversight allows attackers to provide overly long hostname strings that exceed the allocated stack buffer space, leading to a classic buffer overflow condition. The vulnerability specifically targets the stack-based memory allocation pattern where the hostname argument is directly copied onto the stack without proper size verification, making it susceptible to overwriting adjacent memory locations. This architectural weakness aligns with CWE-121, which describes stack-based buffer overflow conditions that occur when insufficient bounds checking prevents buffer overflows.
The operational impact of this vulnerability extends beyond simple denial of service scenarios, potentially enabling remote code execution under specific conditions. When applications are compiled without stack protection mechanisms such as stack canaries, the buffer overflow can be exploited to overwrite return addresses and function pointers, allowing attackers to redirect execution flow and potentially execute arbitrary code. The deprecated nature of clnt_create means that many systems may still contain vulnerable code paths, particularly in legacy applications or embedded systems that continue to rely on this compatibility interface. This vulnerability represents a significant concern for system administrators maintaining older software environments where stack protection features may not be enabled by default.
Mitigation strategies for CVE-2022-23219 require immediate attention through comprehensive system hardening measures and code modernization efforts. Organizations should prioritize updating to glibc versions that have addressed this vulnerability, typically those beyond version 2.35 where the deprecated function has been properly secured or removed. System administrators must also implement runtime protections such as enabling stack canaries and address space layout randomization to reduce exploitability. The ATT&CK framework categorizes this vulnerability under privilege escalation and code execution techniques, specifically targeting the execution of malicious code through memory corruption vulnerabilities. Additionally, defensive measures including input validation at application level and network segmentation can help minimize the attack surface, while regular security audits should identify and eliminate usage of deprecated functions within custom codebases.