CVE-2017-7558 : Security Advisory and Response

Researchers discovered a flaw in the Linux kernel versions 4.7-rc1 through 4.13, leading to a data leakage issue due to an out-of-bound read in specific functions. This vulnerability allows for the leakage of up to 100 bytes of slab data to userspace.

Understanding CVE-2017-7558

This CVE involves a vulnerability in the Linux kernel versions 4.7-rc1 through 4.13 that can result in data leakage to userspace.

What is CVE-2017-7558?

The flaw in the Linux kernel versions 4.7-rc1 through 4.13 allows for a data leakage issue caused by an out-of-bound read in certain functions, leading to the exposure of slab data to userspace.

The Impact of CVE-2017-7558

CVSS Base Score: 5.1 (Medium)
Attack Vector: Local
Attack Complexity: High
Confidentiality Impact: High
Integrity Impact: None
Privileges Required: None
User Interaction: None
Scope: Unchanged
Vector String: CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Technical Details of CVE-2017-7558

This section provides detailed technical information about the CVE.

Vulnerability Description

The vulnerability involves an out-of-bound read in the inet_diag_msg_sctp{,l}addr_fill() and sctp_get_sctp_info() functions, leading to data leakage.

Affected Systems and Versions

The following system and version are affected:

Product: Kernel
Vendor: Linux
Versions: 4.7-rc1 through 4.13

Exploitation Mechanism

The vulnerability occurs when specific functions populate sockaddr data structures used for exporting diagnostic information about the socket, allowing the leakage of up to 100 bytes of slab data to userspace.

Mitigation and Prevention

Protecting systems from CVE-2017-7558 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply relevant patches and updates provided by the vendor.
Monitor vendor advisories for any further instructions.

Long-Term Security Practices

Regularly update and patch the system to prevent known vulnerabilities.
Implement network segmentation and access controls to limit exposure.
Conduct regular security assessments and audits.

Patching and Updates

Ensure that the affected systems are patched with the latest updates to mitigate the vulnerability effectively.