ESB-2017.3133 - [FreeBSD] POSIX shm: Execute arbitrary code/commands - Existing account 2017-12-07

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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
        ---------------------------------

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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