CVE-2021-38785 : What You Need to Know
Discover the impact of CVE-2021-38785, a NULL pointer dereference vulnerability in Allwinner R818 SoC Android Q SDK V1.0 camera driver, allowing system crashes. Learn about the affected systems and mitigation steps.
A NULL pointer deference in the Allwinner R818 SoC Android Q SDK V1.0 camera driver has been identified, allowing an attacker to cause a system crash using a specific ioctl command.
Understanding CVE-2021-38785
This CVE describes a vulnerability in the camera driver of the Allwinner R818 SoC Android Q SDK V1.0 that could result in a system crash.
What is CVE-2021-38785?
The vulnerability involves a NULL pointer dereference in the /dev/cedar_dev driver of the Allwinner R818 SoC Android Q SDK V1.0. Exploiting this, an attacker could use a specific ioctl command to trigger a system crash.
The Impact of CVE-2021-38785
A successful exploit of this vulnerability could lead to a denial of service (DoS) condition, causing the affected system to crash and become unresponsive.
Technical Details of CVE-2021-38785
This section provides more detailed information on the vulnerability.
Vulnerability Description
The issue arises from a NULL pointer dereference within the camera driver of the Allwinner R818 SoC Android Q SDK V1.0, triggered through the IOCTL_GET_IOMMU_ADDR ioctl command.
Affected Systems and Versions
Allwinner R818 SoC Android Q SDK V1.0 is specifically impacted by this vulnerability.
Exploitation Mechanism
By sending a crafted IOCTL_GET_IOMMU_ADDR command to /dev/cedar_dev, an attacker can exploit the NULL pointer dereference to crash the system.
Mitigation and Prevention
To mitigate the risks associated with CVE-2021-38785, follow these recommendations:
Immediate Steps to Take
- Update to the latest version of the Allwinner R818 SoC Android Q SDK V1.0 to address the vulnerability.
- Monitor vendor communications for patches or workarounds.
Long-Term Security Practices
- Implement regular security updates and patches for all software components.
- Conduct security assessments to identify and remediate vulnerabilities proactively.
Patching and Updates
Apply official patches and updates provided by Allwinner as soon as they are available to protect your system from potential exploits.