oss-security - Re: CVE-2014-0181: Linux network reconfiguration due to incorrect netlink checks

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Date: Wed, 23 Apr 2014 12:27:51 -0400 (EDT)
From: cve-assign@...re.org
To: luto@...capital.net
Cc: cve-assign@...re.org, oss-security@...ts.openwall.com
Subject: Re: CVE-2014-0181: Linux network reconfiguration due to incorrect netlink checks

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> It is possible to reconfigure the network on Linux by calling write(2)
> on an appropriately connected netlink socket. By passing such a
> socket as stdout or stderr to a setuid program, anyone can reconfigure
> the network.


> http://marc.info/?l=linux-netdev&m=139820127225921&w=2

> Andy Lutomirski when looking at the networking stack noticed that it is
> possible to trick privileged processes into calling write on a netlink
> socket and send netlink messages they did not intend.
> 
> In particular from time to time there are suid applications that will
> write to stdout or stderr without checking exactly what kind of file
> descriptors those are and can be tricked into acting as a limited form
> of suid cat. In other conversations the magic string CVE-2014-0818 has
> been used to talk about this issue.

First, CVE-2014-0818 is not the correct CVE ID. CVE-2014-0818 is
associated only with a vulnerability in AutoCAD. A CVE ID of
CVE-2014-0181 was in the Subject line.

Also, there are two messages that discuss apparently distinct types of
security issues, suggesting that two or more CVE IDs may be needed:

http://marc.info/?l=linux-netdev&m=139820138225967&w=2
  "The caller needs capabilities on the namespace being queried, not
  on their own namespace. This is a security bug, although it likely
  has only a minor impact." (The patch is in the packet_diag_dump
  function in net/packet/diag.c, but the issue originally was in the
  sock_diag_put_filterinfo function in net/core/sock_diag.c.)

http://marc.info/?l=linux-netdev&m=139820147526004&w=2
  "verify that the opener of the socket had the desired permissions as
  well"

- -- 
CVE assignment team, MITRE CVE Numbering Authority
M/S M300
202 Burlington Road, Bedford, MA 01730 USA
[ PGP key available through http://cve.mitre.org/cve/request_id.html ]
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