#VU9823 Privilege escalation in NetBSD
Published: January 2, 2018
Vulnerability identifier: #VU9823
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: N/A
CWE-ID: CWE-264
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
NetBSD
NetBSD
Software vendor:
NetBSD Foundation, Inc
NetBSD Foundation, Inc
Description
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to an error in compat_linux32 when handling GDT on amd64 system in sys/compat/linux32/arch/amd64/linux32_machdep.c. A local unprivileged user can create a condition where a page fault is generated if a segment register is reloaded with a "high" selector, located near the end of the GDT, and gain root access to the system.
The vulnerability exists due to an error in compat_linux32 when handling GDT on amd64 system in sys/compat/linux32/arch/amd64/linux32_machdep.c. A local unprivileged user can create a condition where a page fault is generated if a segment register is reloaded with a "high" selector, located near the end of the GDT, and gain root access to the system.
Remediation
Install update from vendor's website.