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Vigil@nce - Linux kernel: privilege escalation via ARM CONFIG_OABI_COMPAT
October 2016 by Vigil@nce
This bulletin was written by Vigil@nce : https://vigilance.fr/offer
SYNTHESIS OF THE VULNERABILITY
A local attacker can use sys_oabi_epoll_wait() or
sys_oabi_semtimedop() on a Linux kernel for ARM, in order to
escalate his privileges.
– Impacted products: Debian, Linux, Ubuntu.
– Severity: 2/4.
– Creation date: 17/08/2016.
DESCRIPTION OF THE VULNERABILITY
The Linux kernel can be installed on an ARM processor, with the
CONFIG_OABI_COMPAT option compiled.
However, the sys_oabi_epoll_wait() and sys_oabi_semtimedop()
functions do not check access privileges.
A local attacker can therefore use sys_oabi_epoll_wait() or
sys_oabi_semtimedop() on a Linux kernel for ARM, in order to
escalate his privileges.
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