CVE-2017-11029 : Exploit Details and Defense Strategies

Android for MSM, Firefox OS for MSM, and QRD Android are affected by a user-memory-access issue due to the Camera CPP module Linux driver directly accessing application-provided buffers in user space, potentially leading to a kernel buffer overflow.

Understanding CVE-2017-11029

This CVE involves a vulnerability in various Android platforms that can result in a kernel buffer overflow.

What is CVE-2017-11029?

The problem stems from the Camera CPP module Linux driver in Android for MSM, Firefox OS for MSM, and QRD Android directly accessing user space buffers provided by applications. An unchecked value in userspace is used to copy contents to a kernel buffer, creating the potential for a kernel buffer overflow.

The Impact of CVE-2017-11029

This vulnerability can be exploited to trigger a kernel buffer overflow, potentially leading to arbitrary code execution or system crashes.

Technical Details of CVE-2017-11029

This section delves into the technical aspects of the vulnerability.

Vulnerability Description

The issue arises from the Camera CPP module Linux driver accessing application-provided buffers in user space, leading to a kernel buffer overflow due to unchecked values.

Affected Systems and Versions

Product: Android for MSM, Firefox OS for MSM, QRD Android
Vendor: Qualcomm, Inc.
Versions: All Android releases from CAF using the Linux kernel

Exploitation Mechanism

The problem occurs when an unchecked value in userspace (ioctl_ptr->len) is used to copy contents to a kernel buffer, potentially causing a kernel buffer overflow.

Mitigation and Prevention

Protecting systems from CVE-2017-11029 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply security patches provided by Qualcomm or relevant vendors promptly.
Monitor vendor security bulletins for updates and mitigation guidance.

Long-Term Security Practices

Implement secure coding practices to prevent buffer overflows and other memory-related vulnerabilities.
Regularly update and patch systems to address known security issues.
Conduct security assessments and audits to identify and remediate vulnerabilities.
Employ security mechanisms like address space layout randomization (ASLR) to mitigate exploitation risks.
Consider implementing runtime protections like Control Flow Integrity (CFI) to prevent control-flow hijacking attacks.

Patching and Updates

Stay informed about security updates and patches released by Qualcomm or respective vendors.
Apply patches promptly to mitigate the risk of exploitation and enhance system security.