CVE-2019-15918 : Security Advisory and Response
Learn about CVE-2019-15918, a vulnerability in the Linux kernel before 5.0.10 that allows an out-of-bounds read due to incomplete data structure updates. Find mitigation steps and long-term security practices here.
A problem has been identified in the Linux kernel prior to version 5.0.10. The SMB2_negotiate function in fs/cifs/smb2pdu.c encounters an out-of-bounds read due to incomplete data structure updates following a switch from smb30 to smb21.
Understanding CVE-2019-15918
This CVE involves a vulnerability in the Linux kernel that could lead to an out-of-bounds read due to incomplete data structure updates.
What is CVE-2019-15918?
CVE-2019-15918 is a security flaw in the Linux kernel before version 5.0.10. The issue arises in the SMB2_negotiate function within the file fs/cifs/smb2pdu.c, where an out-of-bounds read occurs because of inadequate data structure updates after transitioning from smb30 to smb21.
The Impact of CVE-2019-15918
The vulnerability could be exploited by an attacker to trigger an out-of-bounds read, potentially leading to information disclosure or further attacks on affected systems.
Technical Details of CVE-2019-15918
This section provides more in-depth technical insights into the CVE.
Vulnerability Description
The problem lies in the SMB2_negotiate function in fs/cifs/smb2pdu.c, where incomplete data structure updates result in an out-of-bounds read.
Affected Systems and Versions
- Linux kernel versions before 5.0.10 are vulnerable to this issue.
Exploitation Mechanism
- Attackers can exploit this vulnerability by manipulating the SMB2_negotiate function to trigger an out-of-bounds read.
Mitigation and Prevention
Protecting systems from CVE-2019-15918 requires immediate actions and long-term security measures.
Immediate Steps to Take
- Apply patches provided by the Linux kernel to address the vulnerability.
- Monitor security advisories for updates and apply them promptly.
Long-Term Security Practices
- Regularly update and patch the Linux kernel to mitigate potential security risks.
- Implement network segmentation and access controls to limit exposure to attacks.
Patching and Updates
- Stay informed about security updates from Linux kernel sources and apply patches as soon as they are available.