CVE-2022-27458 in MariaDB
Summary
by MITRE • 04/14/2022
MariaDB Server v10.6.3 and below was discovered to contain an use-after-free in the component Binary_string::free_buffer() at /sql/sql_string.h.
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Analysis
by VulDB Data Team • 05/22/2025
The vulnerability identified as CVE-2022-27458 represents a critical use-after-free flaw within MariaDB Server versions 10.6.3 and earlier. This issue resides in the Binary_string::free_buffer() function located in the /sql/sql_string.h source file, exposing the database server to potential exploitation scenarios that could compromise system integrity and availability. The flaw manifests when memory allocated for binary string operations is freed prematurely, creating a scenario where subsequent access to the deallocated memory space could lead to undefined behavior and system instability.
The technical nature of this vulnerability stems from improper memory management practices within the MariaDB codebase, specifically in how binary string buffers are handled during memory deallocation processes. When the Binary_string::free_buffer() function executes, it releases memory resources that may still be referenced elsewhere in the application's execution flow. This creates a window of opportunity for attackers to manipulate memory contents or trigger denial-of-service conditions through carefully crafted database operations that exercise the vulnerable code path. The flaw aligns with CWE-416, which categorizes use-after-free vulnerabilities as a direct consequence of improper memory management where freed memory is accessed after deallocation.
The operational impact of this vulnerability extends beyond simple service disruption, as it can potentially enable remote code execution under specific conditions. An attacker who successfully exploits this use-after-free condition could manipulate the database server's memory layout to execute arbitrary code with the privileges of the MariaDB process. This risk is particularly concerning in environments where database servers handle sensitive data or serve as central components in larger application architectures. The vulnerability affects MariaDB Server versions up to and including 10.6.3, making it relevant for organizations maintaining legacy database deployments that have not yet been updated to patched versions.
Mitigation strategies for CVE-2022-27458 primarily focus on immediate version upgrades to MariaDB Server 10.6.4 or later, where the memory management issue has been addressed through proper implementation of buffer handling routines. Organizations should also implement network segmentation and access controls to limit exposure of database servers to untrusted networks, reducing the attack surface for potential exploitation attempts. Additionally, monitoring systems should be enhanced to detect anomalous database behavior patterns that might indicate exploitation attempts, particularly around memory allocation and deallocation activities. The remediation approach aligns with ATT&CK technique T1059.001 for command and scripting interpreter usage, as exploitation may involve crafting database queries that trigger the vulnerable memory management path. Regular security assessments and vulnerability scanning should be conducted to identify other potential memory corruption issues within database server components, as similar patterns may exist in other parts of the MariaDB codebase.