CVE-2021-2310: 
VirtualBox vulnerability analysis and mitigation

Oracle VirtualBox NAT Heap-based Buffer Overflow Privilege Escalation Vulnerability (CVE-2021-2310) was discovered in Oracle VM VirtualBox versions prior to 6.1.20. The vulnerability was disclosed and patched in April 2021. This security flaw affects the Network Address Translation (NAT) component of Oracle VM VirtualBox, a popular virtualization software (Oracle CPUApr2021, ZDI Advisory).

The vulnerability exists within the implementation of NAT in VirtualBox. The specific flaw results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length heap-based buffer. The vulnerability has been assigned a CVSS v3.1 base score of 7.5 (High) with the following vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H (ZDI Advisory).

A successful exploitation of this vulnerability can result in takeover of Oracle VM VirtualBox. The vulnerability allows an attacker to escalate privileges and execute arbitrary code in the context of the hypervisor (ZDI Advisory).

Oracle has released a security patch to address this vulnerability in VirtualBox version 6.1.20. Users are strongly recommended to upgrade to this version or later to mitigate the risk. The fix was included in Oracle's Critical Patch Update for April 2021 (Oracle CPUApr2021, Gentoo Advisory).

Security researchers and industry experts have acknowledged the severity of this vulnerability. The discovery was credited to Max Van Amerongen (maxpl0it) who worked with Trend Micro's Zero Day Initiative to report the vulnerability to Oracle (Oracle CPUApr2021, Hacker News).