oss-sec mailing list archives
Re: CVE-2014-0181: Linux network reconfiguration due to incorrect netlink checks
From: Andy Lutomirski <luto () amacapital net>
Date: Wed, 23 Apr 2014 10:12:44 -0700
[I think something went wrong with the quoting in here.] On Wed, Apr 23, 2014 at 9:27 AM, <cve-assign () mitre org> wrote:
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1It 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=2Andy 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.)
This may need a new CVE. I'm not really clear on what the impact of this is, if any. It's an information disclosure issue, but I'm not entirely sure that valuable information is being disclosed.
http://marc.info/?l=linux-netdev&m=139820147526004&w=2 "verify that the opener of the socket had the desired permissions as well"
This is the proposed method of fixing CVE-2014-0181 --Andy
Current thread:
- CVE-2014-0181: Linux network reconfiguration due to incorrect netlink checks Andy Lutomirski (Apr 22)
- Re: CVE-2014-0181: Linux network reconfiguration due to incorrect netlink checks Andy Lutomirski (Apr 22)
- Re: CVE-2014-0181: Linux network reconfiguration due to incorrect netlink checks cve-assign (Apr 23)
- Re: CVE-2014-0181: Linux network reconfiguration due to incorrect netlink checks Andy Lutomirski (Apr 23)
- Re: CVE-2014-0181: Linux network reconfiguration due to incorrect netlink checks Eric W. Biederman (Apr 23)
- Re: CVE-2014-0181: Linux network reconfiguration due to incorrect netlink checks cve-assign (Apr 23)
- Re: CVE-2014-0181: Linux network reconfiguration due to incorrect netlink checks Andy Lutomirski (Apr 28)
- Re: CVE-2014-0181: Linux network reconfiguration due to incorrect netlink checks Andy Lutomirski (Apr 22)