Vulnerability identifier: #VU9992

Vulnerability risk: Low

CVSSv3.1: 8.6 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:F/RL:U/RC:C]

CVE-ID: CVE-2018-1000001

CWE-ID: CWE-124

Exploitation vector: Local

Exploit availability: Yes

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 in due to a change in the processing of pathnames in the getcwd() command introduced in Linux kernel. A local attacker can use a specially crafted application, trigger buffer underflow in the __realpath() function in 'stdlib/canonicalize.c' and execute arbitrary code with root privileges.

Successful exploitation of the vulnerability may result in system compromise.

Mitigation
Cybersecurity Help is currently unaware of any solutions addressing the vulnerability.

Vulnerable software versions

Linux kernel: 2.6.36

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External links
http://www.halfdog.net/Security/2017/LibcRealpathBufferUnderflow/

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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, a fully functional exploit for this vulnerability is available.