Arch Linux Security Advisory ASA-201706-22 ========================================== Severity: High Date : 2017-06-20 CVE-ID : CVE-2017-1000366 Package : lib32-glibc Type : privilege escalation Remote : No Link : https://security.archlinux.org/AVG-308 Summary ======= The package lib32-glibc before version 2.25-4 is vulnerable to privilege escalation. Resolution ========== Upgrade to 2.25-4. # pacman -Syu "lib32-glibc>=2.25-4" The problem has been fixed upstream but no release is available yet. Workaround ========== None. Description =========== A flaw was found in the way memory was being allocated on the stack for user space binaries. If heap (or different memory region) and stack memory regions were adjacent to each other, an attacker could use this flaw to jump over the stack guard gap, cause controlled memory corruption on process stack or the adjacent memory region, and thus increase their privileges on the system. This is glibc-side mitigation which blocks processing of LD_LIBRARY_PATH for programs running in secure-execution mode and reduces the number of allocations performed by the processing of LD_AUDIT, LD_PRELOAD, and LD_HWCAP_MASK, making successful exploitation of this issue more difficult. Impact ====== A local attacker is able to execute arbitrary code on the affected host that is effectively leading to elevation of privileges by choosing a suitable target application. References ========== https://www.qualys.com/2017/06/19/stack-clash/stack-clash.txt https://security.archlinux.org/CVE-2017-1000366