Buffer overflow in edk2 - CVE-2018-12182

Vulnerability identifier: #VU95178

CSH Severity: Low

CVSS v4 BT: 5.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-12182

CWE-ID: CWE-119

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to insufficient memory write check in SMM service. A local user can trigger memory corruption and execute arbitrary code with elevated privileges.

edk2
Ubuntu
ovmf (Ubuntu package)
qemu-efi (Ubuntu package)
qemu-efi-aarch64 (Ubuntu package)
qemu-efi-arm (Ubuntu package)

Install updates from vendor's website.

edk2 - update to edk2-stable201905
ovmf (Ubuntu package) - update to Ubuntu Pro
qemu-efi (Ubuntu package) - update to Ubuntu Pro
qemu-efi-aarch64 (Ubuntu package) - update to Ubuntu Pro
qemu-efi-arm (Ubuntu package) - update to Ubuntu Pro

• http://www.securityfocus.com/bid/107648
• https://edk2-docs.gitbooks.io/security-advisory/content/sw-smi-confused-deputy-smramsavestate_c.html
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TQYVZRFEXSN3KS43AVH4D7QX553EZQYP/
• https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03912en_us

• Privilege escalation in EDK2
• Ubuntu update for edk2