CVE-2007-6227 in QEMU
Summary
by MITRE
QEMU 0.9.0 allows local users of a Windows XP SP2 guest operating system to overwrite the TranslationBlock (code_gen_buffer) buffer, and probably have unspecified other impacts related to an "overflow," via certain Windows executable programs, as demonstrated by qemu-dos.com.
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Analysis
by VulDB Data Team • 12/28/2024
The vulnerability identified as CVE-2007-6227 represents a critical buffer overflow condition within QEMU version 0.9.0 that specifically affects Windows XP SP2 guest operating systems. This issue arises from inadequate bounds checking during the emulation process, creating a scenario where malicious code executed within the virtualized environment can exploit memory management flaws to overwrite critical internal buffers. The vulnerability is particularly concerning as it demonstrates how virtualization platforms can become attack vectors when proper memory protection mechanisms are absent or insufficiently implemented.
The technical flaw manifests in the TranslationBlock buffer management system known as code_gen_buffer, which serves as a crucial component in QEMU's dynamic binary translation process. When Windows XP SP2 guest systems execute certain Windows executable programs, the virtualization layer fails to properly validate buffer boundaries during code generation, allowing attackers to write beyond allocated memory regions. This overflow condition directly targets the code_gen_buffer which contains translated machine code that QEMU generates for performance optimization. The vulnerability's exploitation requires local access within the guest operating system, making it a privilege escalation issue that can potentially be leveraged to gain unauthorized control over the virtual machine's execution environment.
The operational impact of this vulnerability extends beyond simple memory corruption, as it can potentially enable attackers to execute arbitrary code within the host system or compromise the integrity of the entire virtualization environment. The unspecified other impacts mentioned in the description suggest that the buffer overflow may lead to unpredictable behavior including denial of service conditions, privilege escalation, or even complete system compromise depending on the specific execution context. This vulnerability particularly affects enterprise environments that rely heavily on virtualization technologies, as it demonstrates how guest operating system exploits can be used to breach the isolation boundaries that virtualization platforms are designed to maintain.
This vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and reflects patterns commonly found in virtualization security flaws that involve improper memory management during code generation phases. The attack vector demonstrates characteristics consistent with ATT&CK technique T1059.007 for Windows Command Shell execution, as the vulnerability enables local code execution that can be leveraged for further exploitation. Organizations should implement immediate mitigations including updating to QEMU versions that address this buffer overflow, implementing strict guest operating system access controls, and monitoring for anomalous code generation patterns that may indicate exploitation attempts. The vulnerability also underscores the importance of comprehensive memory safety testing for virtualization platforms and highlights the need for robust input validation mechanisms in dynamic translation systems that are critical to virtual machine performance optimization.