CVE-2017-7184 : Exploit Details and Defense Strategies

This CVE describes a vulnerability in the Linux kernel up to version 4.10.6 that allows local users to gain root privileges or cause denial of service.

Understanding CVE-2017-7184

This vulnerability was demonstrated during the Pwn2Own competition at CanSecWest 2017.

What is CVE-2017-7184?

The xfrm_replay_verify_len function in the Linux kernel does not properly validate certain data sizes after an XFRM_MSG_NEWAE update, enabling local users with CAP_NET_ADMIN capability to exploit it.

The Impact of CVE-2017-7184

Local users can gain root privileges or cause a denial of service by triggering a heap-based out-of-bounds access.

Technical Details of CVE-2017-7184

The following technical details provide insight into the vulnerability:

Vulnerability Description

The xfrm_replay_verify_len function in net/xfrm/xfrm_user.c in the Linux kernel through 4.10.6 lacks proper validation, leading to the security issue.

Affected Systems and Versions

The vulnerability affects Linux kernel versions up to 4.10.6.

Exploitation Mechanism

Local users with the CAP_NET_ADMIN capability can exploit this vulnerability.

Mitigation and Prevention

To address CVE-2017-7184, consider the following steps:

Immediate Steps to Take

Apply relevant patches provided by the Linux kernel maintainers.
Monitor official sources for updates and security advisories.

Long-Term Security Practices

Regularly update the Linux kernel to the latest stable version.
Implement the principle of least privilege to limit user capabilities.

Patching and Updates

Stay informed about security updates and apply them promptly to mitigate risks.