Risk | Low |
Patch available | YES |
Number of vulnerabilities | 1 |
CVE-ID | CVE-2019-20908 |
CWE-ID | CWE-276 |
Exploitation vector | Local |
Public exploit | N/A |
Vulnerable software Subscribe |
Linux kernel Operating systems & Components / Operating system |
Vendor | Linux Foundation |
Security Bulletin
This security bulletin contains one low risk vulnerability.
EUVDB-ID: #VU34141
Risk: Low
CVSSv3.1: 5.8 [CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2019-20908
CWE-ID:
CWE-276 - Incorrect Default Permissions
Exploit availability: No
DescriptionThe vulnerability allows a local privileged user to execute arbitrary code.
An issue was discovered in drivers/firmware/efi/efi.c in the Linux kernel before 5.4. Incorrect access permissions for the efivar_ssdt ACPI variable could be used by attackers to bypass lockdown or secure boot restrictions, aka CID-1957a85b0032.
MitigationInstall update from vendor's website.
Vulnerable software versionsLinux kernel: 5.0 - 5.3.18
External linkshttp://lists.opensuse.org/opensuse-security-announce/2020-08/msg00009.html
http://www.openwall.com/lists/oss-security/2020/07/20/6
http://www.openwall.com/lists/oss-security/2020/07/29/3
http://www.openwall.com/lists/oss-security/2020/07/30/2
http://www.openwall.com/lists/oss-security/2020/07/30/3
http://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4
http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1957a85b0032a81e6482ca4aab883643b8dae06e
http://git.zx2c4.com/american-unsigned-language/tree/american-unsigned-language.sh
http://mailarchives.bentasker.co.uk/Mirrors/OSSSec/2020/06-Jun/msg00035.html
http://usn.ubuntu.com/4426-1/
http://usn.ubuntu.com/4427-1/
http://usn.ubuntu.com/4439-1/
http://usn.ubuntu.com/4440-1/
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.