Vulnerability identifier: #VU13601

Vulnerability risk: Low

CVSSv3.1: 5.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2018-13100

CWE-ID: CWE-369

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 cause DoS condition on the target system.

The vulnerability exists due to improper validation of secs_per_zone information in a corrupted Flash-Friendly File System (F2FS) image. A local attacker can mount a specially crafted F2FS image, trigger a divide-by-zero condition in the reset_curseg() function, as defined in the fs/f2fs/super.c source code file and cause the system to crash.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 4.17.1 - 4.17.3, 4.16 - 4.16.18, 4.15 - 4.15.18

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External links
http://bugzilla.kernel.org/show_bug.cgi?id=200183

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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. However, proof of concept for this vulnerability is available.