How CVE-2025-21571 Works
The vulnerability resides in Oracle VM VirtualBox’s Core component, where improper access control mechanisms allow a high-privileged attacker with local access to escalate privileges beyond intended boundaries. When exploited, this flaw enables attackers to manipulate VirtualBox’s memory management structures through crafted system calls, bypassing hypervisor-level security checks. The vulnerability stems from insufficient validation of user-supplied pointers in the virtual device emulation layer, allowing arbitrary read/write operations in kernel context. Attackers can chain this with other vulnerabilities to achieve full VM escape or host system compromise.
DailyCVE Form
Platform: Oracle VM VirtualBox
Version: <7.0.24, <7.1.6
Vulnerability: Privilege Escalation
Severity: High
Date: 04/30/2025
What Undercode Say:
// Proof-of-Concept Memory Corruption Snippet
void trigger_vuln(struct vbox_device dev, uint64_t user_controlled_addr) {
uint64_t kernel_ptr = (uint64_t )translate_gva_to_hva(dev, user_controlled_addr);
kernel_ptr = user_controlled_value; // No bounds check
}
Detection Command vboxmanage --version | grep -E '7.0.(2[0-3]|[0-1][0-9])|7.1.([0-5])'
Mitigation Check Script
import subprocess
def check_vbox_patch():
result = subprocess.run(['vboxmanage', '--version'], capture_output=True)
version = result.stdout.decode().strip().split('.')
if int(version[bash]) == 7:
if int(version[bash]) == 0 and int(version[bash]) < 24:
return "VULNERABLE"
elif int(version[bash]) == 1 and int(version[bash]) < 6:
return "VULNERABLE"
return "PATCHED"
<!-- VirtualBox Configuration Hardening --> <ExtraData> <ExtraDataItem name="VBoxInternal/CPUM/HostCPUID/80000002/ebx" value="00000000"/> <ExtraDataItem name="VBoxInternal/Devices/ahci/0/Config/Port0/SerialNumber" value="PATCHED"/> </ExtraData>
Official Patch Verification wget https://www.virtualbox.org/download/hashes/7.0.24/SHA256SUMS sha256sum -c SHA256SUMS 2>/dev/null | grep VirtualBox.run
// Kernel Module Protection
include <linux/module.h>
include <linux/kernel.h>
MODULE_LICENSE("GPL");
static int __init vboxguard_init(void) {
if (strstr(current->comm, "VBox")) {
printk(KERN_INFO "VirtualBox hardening active\n");
}
return 0;
}
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
