Date: Thu, 10 Apr 2014 16:24:06 GMT From: David Noel <david.i.noel@gmail.com> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/188429: MITM attacks against freebsd-update Message-ID: <201404101624.s3AGO6Rv034923@cgiserv.freebsd.org> Resent-Message-ID: <201404101630.s3AGU0eA042089@freefall.freebsd.org>
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>Number: 188429 >Category: kern >Synopsis: MITM attacks against freebsd-update >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Thu Apr 10 16:30:00 UTC 2014 >Closed-Date: >Last-Modified: >Originator: David Noel >Release: 9.2 >Organization: >Environment: >Description: freebsd-update.sh extracts fetched data prior to its SHA256 verification. The extraction libraries used have a long history of bugs so it’s reasonable to assume there might be more. freebsd-update runs as root. Using a vulnerability in the decompression libraries an attacker who was MITM-capable could compromise any FreeBSD system running freebsd-update. >How-To-Repeat: >Fix: Solution Summary: a re-working of the snapshot hashing and hash verification process. The functions of concern in freebsd-update.sh are fetch_metadata(), fetch_files_premerge(), and fetch_files(). >Release-Note: >Audit-Trail: >Unformatted:
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