SB2018082323 - Multiple vulnerabilities in OpenBSD

Description

This security bulletin contains information about 2 vulnerabilities.

1) Information disclosure (CVE-ID: N/A)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to absent security check when saving user's FPU in vm_machdep.c file. A local user can read FPU state of another userland process. 

2) Information disclosure (CVE-ID: N/A)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to the Intel L1TF vulnerability that allows a vmm guest to read host memory. A local privileged user on virtual machine can gain access to data stored in memory on the host system.

Remediation

Install update from vendor's website.

References

• https://ftp.openbsd.org/pub/OpenBSD/patches/6.2/common/022_fpufork.patch.sig
• https://ftp.openbsd.org/pub/OpenBSD/patches/6.3/common/018_vmml1tf.patch.sig