#VU10918 Security restrictions bypass in Linux kernel - CVE-2018-7755

Vulnerability identifier: #VU10918

Vulnerability risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-7755

CWE-ID: CWE-264

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description
The vulnerability allows a local unauthenticated attacker to bypass security restrictions on the target system.

The weakness exists in the drivers/block/floppy.c source code in the fd_locked_ioctl function due to insufficient security restrictions. A local attacker can bypass security restrictions through the system floppy drive and obtain kernel code and data from the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Linux kernel: 2.4.13, 4.12 - 4.15.7

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External links
https://lkml.org/lkml/2018/3/7/1116
https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.74
https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.160
https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.131
https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.12

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.