CVE-2017-5550 : What You Need to Know

CVE-2017-5550, published on January 20, 2017, pertains to an off-by-one error in the Linux kernel prior to version 4.9.5. This vulnerability in the pipe_advance function can be exploited by local users to access uninitialized heap-memory locations.

Understanding CVE-2017-5550

This CVE entry highlights a specific flaw in the Linux kernel that could lead to the exposure of sensitive information through a local exploit.

What is CVE-2017-5550?

The pipe_advance function in the Linux kernel version before 4.9.5 is vulnerable to an off-by-one error. This flaw allows local users to gain access to uninitialized heap-memory locations, potentially leading to the exposure of sensitive data.

The Impact of CVE-2017-5550

The vulnerability can be exploited by local users in certain scenarios to obtain sensitive information by reading from a pipe following an incorrect buffer-release decision.

Technical Details of CVE-2017-5550

This section delves into the technical aspects of the CVE.

Vulnerability Description

The pipe_advance function in the Linux kernel's lib/iov_iter.c file prior to version 4.9.5 contains an off-by-one error, enabling local users to access uninitialized heap-memory locations.

Affected Systems and Versions

Affected Versions: Linux kernel versions before 4.9.5
Affected Component: pipe_advance function

Exploitation Mechanism

The vulnerability can be exploited by local users in specific situations where they can gain access to uninitialized heap-memory locations by reading from a pipe following an incorrect buffer-release decision.

Mitigation and Prevention

Protecting systems from CVE-2017-5550 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply relevant patches and updates to the Linux kernel to mitigate the vulnerability.
Monitor and restrict local user access to critical system components.

Long-Term Security Practices

Implement the principle of least privilege to limit user access rights.
Regularly update and patch the Linux kernel to address security vulnerabilities.

Patching and Updates

Ensure timely installation of security patches released by the Linux kernel maintainers.