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Date: Wed, 19 Oct 2016 17:35:49 -0400 (EDT)
From: cve-assign@...re.org
To: jmm@...ian.org
Cc: cve-assign@...re.org, oss-security@...ts.openwall.com
Subject: Re: CVE request for tor

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> https://blog.torproject.org/blog/tor-0289-released-important-fixes
> https://github.com/torproject/tor/commit/3cea86eb2fbb65949673eb4ba8ebb695c87a57ce
> https://trac.torproject.org/projects/tor/ticket/20384

> Tor 0.2.8.9 backports a fix for a security hole in previous versions
> of Tor that would allow a remote attacker to crash a Tor client,
> hidden service, relay, or authority.

> Prevent a class of security bugs caused by treating the contents of a
> buffer chunk as if they were a NUL-terminated string. At least one
> such bug seems to be present in all currently used versions of Tor,
> and would allow an attacker to remotely crash most Tor instances,
> especially those compiled with extra compiler hardening. With this
> defense in place, such bugs can't crash Tor, though we should still
> fix them as they occur. Closes ticket 20384

> Add a one-word sentinel value of 0x0 at the end of each buf_t chunk
> 
> This helps protect against bugs where any part of a buf_t's memory
> is passed to a function that expects a NUL-terminated input.

Here, we will assign the ID to the broadest possible interpretation of
the issue, which perhaps can be restated as "Tor internal functions
were entitled to expect that buf_t data had NUL termination, but the
implementation of or/buffers.c did not ensure that NUL termination was
present."

Use CVE-2016-8860.

With this CVE, any related "we should still fix them as they occur"
patches can most likely be treated as defense-in-depth changes, and
won't require separate CVE IDs.

- -- 
CVE Assignment Team
M/S M300, 202 Burlington Road, Bedford, MA 01730 USA
[ A PGP key is available for encrypted communications at
  http://cve.mitre.org/cve/request_id.html ]
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