#VU92423 Incorrect authorization in Linux kernel - CVE-2020-25284

Vulnerability identifier: #VU92423

Vulnerability risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-25284

CWE-ID: CWE-863

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description

The vulnerability allows a local privileged user to manipulate data.

The vulnerability exists due to incorrect authorization error within the rbd_config_info_show(), rbd_image_refresh(), do_rbd_add() and do_rbd_remove() functions in drivers/block/rbd.c. A local privileged user can manipulate data.

Mitigation
Install update from vendor's repository.

Vulnerable software versions

Linux kernel: All versions

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External links
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f44d04e696feaf13d192d942c4f14ad2e117065a
https://twitter.com/grsecurity/status/1304537507560919041
https://lists.debian.org/debian-lts-announce/2020/09/msg00025.html
https://lists.opensuse.org/opensuse-security-announce/2020-10/msg00001.html
https://lists.opensuse.org/opensuse-security-announce/2020-10/msg00021.html
https://lists.debian.org/debian-lts-announce/2020/10/msg00034.html
https://lists.debian.org/debian-lts-announce/2020/10/msg00032.html

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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.