#VU7761 Privilege escalation in Linux kernel - CVE-2017-10663

Vulnerability identifier: #VU7761

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2017-10663

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 attacker to gain elevated privileges on the target system.

The weakness exists due to improper validation of the blkoff and segno arrays by the sanity_check_ckpt function in fs/f2fs/super.c in the Linux kernel. a local attacker can execute arbitrary code with root privileges.

Mitigation
Update to version 4.12.4.

Vulnerable software versions

Linux kernel: 4.0.1 - 4.0.9, 4.1.1 - 4.12.3, 4.2.0 - 4.2.8, 4.3.1 - 4.3.6, 4.4.0 - 4.4.83, 4.5.0 - 4.5.7, 4.6.0 - 4.6.7, 4.7.0 - 4.7.10, 4.8.0 - 4.8.17, 4.9.1 - 4.9.44

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External links
https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.12.4

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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.