Versions Affected : All versions prior to TrueNAS 13.0-U2

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Description

When dumping core and saving process information, proc_getargv() might return an sbuf which have a sbuf_len() of 0 or -1, which is not properly handled.

An out-of-bound read can happen when user constructs a specially crafted ps_string, which in turn can cause the kernel to crash.

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Workaround

The system administrator can workaround this issue by disabling coredump. This can be done by adding:

kern.coredump=0

to /etc/sysctl.conf and run

service sysctl start

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Mitigation

• Upgrade to TrueNAS 13.0-U2 or later.

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Commit

• FreeBSD Revision Hash: 69a456c0b60b
• TrueNAS Commit
• TrueNAS Commit
• JIRA Ticket : NAS-117683

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Further information

• FreeBSD Errata Notice Entry