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AUSCERT External Security Bulletin Redistribution
POSIX shm allows jails to access global namespace
7 December 2017
AusCERT Security Bulletin Summary
Product: POSIX shm
Operating System: FreeBSD
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Increased Privileges -- Existing Account
Denial of Service -- Existing Account
CVE Names: CVE-2017-1087
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FreeBSD -- POSIX shm allows jails to access global namespace
10.4 <= FreeBSD-kernel < 10.4_3
10.3 <= FreeBSD-kernel < 10.3_24
VuXML ID 5b1463dd-dab3-11e7-b5af-a4badb2f4699
Named paths are globally scoped, meaning a process located in one jail can
read and modify the content of POSIX shared memory objects created by a
process in another jail or the host system.
A malicious user that has access to a jailed system is able to abuse shared
memory by injecting malicious content in the shared memory region. This memory
region might be executed by applications trusting the shared memory, like
This issue could lead to a Denial of Service or local privilege escalation.
CVE Name CVE-2017-1087
FreeBSD Advisory SA-17:09.shm
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