Privilege escalation in Linux kernel

1) Out-of-bounds write

EUVDB-ID: #VU47051

Risk: Low

CVSSv3.1: 3.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-14386

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: Yes

Description

The vulnerability allows a local privileged user to execute arbitrary code.

A flaw was found in the Linux kernel before 5.9-rc4. Memory corruption can be exploited to gain root privileges from unprivileged processes. The highest threat from this vulnerability is to data confidentiality and integrity.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 5.0 - 5.8.0

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:5.0.21:*:*:*:*:*:*:
• cpe:2.3:o:linux_foundation:linux_kernel:5.1.21:*:*:*:*:*:*:
• cpe:2.3:o:linux_foundation:linux_kernel:5.2.21:*:*:*:*:*:*:
• cpe:2.3:o:linux_foundation:linux_kernel:5.3.18:*:*:*:*:*:*:
• cpe:2.3:o:linux_foundation:linux_kernel:5.4.42:*:*:*:*:*:*:
• cpe:2.3:o:linux_foundation:linux_kernel:5.5.19:*:*:*:*:*:*:
• cpe:2.3:o:linux_foundation:linux_kernel:5.6.14:*:*:*:*:*:*:
• cpe:2.3:o:linux_foundation:linux_kernel:5.7.7:*:*:*:*:*:*:
• cpe:2.3:o:linux_foundation:linux_kernel:5.8.0:*:*:*:*:*:*:

External links

http://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-14386
http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=acf69c946233259ab4d64f8869d4037a198c7f06
http://seclists.org/oss-sec/2020/q3/146

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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