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AUSCERT External Security Bulletin Redistribution
ESB-2017.3133
POSIX shm allows jails to access global namespace
7 December 2017
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AusCERT Security Bulletin Summary
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Product: POSIX shm
Publisher: FreeBSD
Operating System: FreeBSD
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Increased Privileges -- Existing Account
Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2017-1087
Reference: ESB-2017.2912
Original Bulletin:
http://www.vuxml.org/freebsd/5b1463dd-dab3-11e7-b5af-a4badb2f4699.html
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FreeBSD -- POSIX shm allows jails to access global namespace
Affected packages
10.4 <= FreeBSD-kernel < 10.4_3
10.3 <= FreeBSD-kernel < 10.3_24
Details
VuXML ID 5b1463dd-dab3-11e7-b5af-a4badb2f4699
Discovery 2017-11-15
Entry 2017-12-06
Problem Description:
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.
Impact:
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
Squid.
This issue could lead to a Denial of Service or local privilege escalation.
References
CVE Name CVE-2017-1087
FreeBSD Advisory SA-17:09.shm
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