CVE-2018-14633 : Security Advisory and Response
Discover the impact of CVE-2018-14633, a vulnerability in Linux kernel's ISCSI target code allowing remote attackers to trigger a stack buffer overflow, potentially leading to denial-of-service or unauthorized data access.
A security vulnerability was discovered in the chap_server_compute_md5() function within the Linux kernel's ISCSI target code, affecting various kernel versions.
Understanding CVE-2018-14633
This CVE involves a stack buffer overflow vulnerability in the Linux kernel's ISCSI target code, potentially leading to denial-of-service or unauthorized access scenarios.
What is CVE-2018-14633?
The vulnerability in the chap_server_compute_md5() function of the Linux kernel's ISCSI target code allows a remote attacker to trigger a stack buffer overflow, impacting the stack by corrupting up to 17 bytes. The attacker can exploit this without authentication privileges by targeting hosts with iSCSI enabled.
The Impact of CVE-2018-14633
- Attack complexity: High
- Attack vector: Network
- Base score: 7 (High)
- Availability impact: High
- Confidentiality impact: Low
- Integrity impact: Low
- Privileges required: None
- Scope: Unchanged
- User interaction: None
The impact varies based on the target's code compilation, potentially leading to system crashes, denial-of-service, or unauthorized data access.
Technical Details of CVE-2018-14633
The following technical details provide insight into the vulnerability and its implications:
Vulnerability Description
The flaw in the chap_server_compute_md5() function of the Linux kernel's ISCSI target code allows a remote attacker to trigger a stack buffer overflow.
Affected Systems and Versions
- Product: Kernel
- Vendor: The Linux Foundation
- Vulnerable versions: 4.18.x, 4.14.x, 3.10.x
Exploitation Mechanism
To exploit this vulnerability, the iSCSI target must be enabled on the host, and the attacker can trigger a stack buffer overflow without authentication privileges.
Mitigation and Prevention
Taking immediate steps and implementing long-term security practices are crucial to mitigating the risks associated with CVE-2018-14633.
Immediate Steps to Take
- Disable iSCSI if not required
- Apply vendor patches and updates
- Monitor network traffic for suspicious activities
Long-Term Security Practices
- Regularly update and patch systems
- Conduct security audits and assessments
- Implement network segmentation and access controls
Patching and Updates
- Refer to vendor advisories for specific patch details
- Apply patches promptly to address the vulnerability