Vulnerability identifier: #VU51433
Vulnerability risk: Low
CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID:
CWE-ID:
CWE-367
Exploitation vector: Local
Exploit availability: No
Vulnerable software:
Linux kernel
Operating systems & Components /
Operating system
Vendor:
Description
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a TOCTOU mismatch in the NFS client code in the Linux kernel. A local user can run a specially crafted program to trigger memory corruption and execute arbitrary code on the system with elevated privileges.Mitigation
Install updates from vendor's website.
Vulnerable software versions
External links
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00021.html
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00035.html
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00042.html
http://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.3
http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b4487b93545214a9db8cbf32e86411677b0cca21
http://lists.debian.org/debian-lts-announce/2020/09/msg00025.html
http://lists.debian.org/debian-lts-announce/2020/10/msg00032.html
http://lists.debian.org/debian-lts-announce/2020/10/msg00034.html
http://twitter.com/grsecurity/status/1303370421958578179
http://usn.ubuntu.com/4525-1/
http://usn.ubuntu.com/4527-1/
http://usn.ubuntu.com/4578-1/
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.