CVE-2011-1583 in Xen
Summary
by MITRE
Multiple integer overflows in tools/libxc/xc_dom_bzimageloader.c in Xen 3.2, 3.3, 4.0, and 4.1 allow local users to cause a denial of service and possibly execute arbitrary code via a crafted paravirtualised guest kernel image that triggers (1) a buffer overflow during a decompression loop or (2) an out-of-bounds read in the loader involving unspecified length fields.
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Analysis
by VulDB Data Team • 01/13/2025
The vulnerability identified as CVE-2011-1583 represents a critical security flaw affecting multiple versions of the Xen virtual machine monitor including versions 3.2, 3.3, 4.0, and 4.1. This issue resides within the tools/libxc/xc_dom_bzimageloader.c component which handles the loading of paravirtualized guest kernel images. The flaw manifests as multiple integer overflows that can be exploited by local attackers to potentially cause system instability or execute malicious code. The vulnerability specifically targets the decompression process of guest kernel images, creating conditions where normal system operations can be disrupted through carefully crafted input data.
The technical implementation of this vulnerability involves two primary attack vectors that exploit different aspects of integer handling within the Xen hypervisor. The first vector creates a buffer overflow during the decompression loop when processing maliciously crafted kernel images, while the second vector generates out-of-bounds read operations involving unspecified length fields within the loader component. These integer overflows occur during the parsing and processing of compressed kernel images that paravirtualized guests present to the hypervisor during boot operations. The flaw demonstrates poor input validation and inadequate bounds checking when handling integer values that determine buffer sizes and memory access limits during decompression operations.
The operational impact of CVE-2011-1583 extends beyond simple denial of service scenarios to potentially enable arbitrary code execution within the hypervisor environment. Local users with access to a paravirtualized guest can leverage this vulnerability to compromise the integrity of the host system running the Xen hypervisor. The vulnerability's exploitation can lead to complete system compromise, as successful attacks may allow attackers to escalate privileges and gain control over the underlying physical hardware. This represents a significant threat to virtualized environments where multiple tenants share the same physical infrastructure, as a compromised guest could potentially affect other virtual machines running on the same host.
The security implications of this vulnerability align with CWE-190, which categorizes integer overflows as a fundamental weakness in software design that can lead to buffer overflows and memory corruption. The attack pattern follows techniques described in the ATT&CK framework under privilege escalation and defense evasion tactics, where local users can exploit hypervisor flaws to gain elevated privileges and maintain persistent access to virtualized environments. Organizations using affected Xen versions face significant risk as this vulnerability can be exploited without requiring network access, making it particularly dangerous in environments where local user access is not properly restricted.
Mitigation strategies for CVE-2011-1583 require immediate patching of affected Xen hypervisor versions to address the integer overflow conditions in the kernel image loader component. System administrators should prioritize updating to patched versions of Xen that include proper integer overflow checks and bounds validation during decompression operations. Additionally, implementing strict access controls and limiting local user privileges on systems running affected hypervisor versions can help reduce the attack surface. Network segmentation and monitoring for unusual decompression activities may provide additional detection capabilities for potential exploitation attempts. The vulnerability underscores the importance of proper input validation and integer handling in hypervisor components, as these security measures directly impact the overall security posture of virtualized infrastructure environments.