Vulnerability identifier: #VU10957

Vulnerability risk: Low

CVSSv3.1: 7 [CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2018-7738

CWE-ID: CWE-264

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Util-linux
Universal components / Libraries / Libraries used by multiple products

Vendor: kernel.org

Description
The vulnerability allows a local attacker to gain elevated privileges on the target system.

The weakness exists due to insufficient validation of shell commands that are used in the name of a mountpoint. A local attacker can embed crafted shell commands in the name of a mountpoint. If another user on the system executes the umount command along with a tab character for autocomplete, the attacker can gain elevated privileges.

Mitigation
Update to version 2.32-rc1.

Vulnerable software versions

Util-linux: 2.20 - 2.31

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External links
http://mirrors.edge.kernel.org/pub/linux/utils/util-linux/v2.32/v2.32-rc1-ChangeLog

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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.