oss-security - Re: CVE request: kernel: heap overflow in TIPC

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Date: Fri, 22 Oct 2010 10:38:52 -0400 (EDT)
From: Josh Bressers <bressers@...hat.com>
To: oss-security@...ts.openwall.com
Cc: coley <coley@...re.org>
Subject: Re: CVE request: kernel: heap overflow in TIPC

Please use CVE-2010-3859

Thanks.

-- 
    JB


----- "Dan Rosenberg" <dan.j.rosenberg@...il.com> wrote:

> The tipc_msg_build() function in net/tipc/msg.c contains an
> exploitable kernel heap overflow that would allow a local user to
> escalate privileges to root by issuing maliciously crafted sendmsg()
> calls via TIPC sockets.
> 
> Fortunately, none of the distributions I tested actually define a
> module alias for TIPC even though it is compiled as a module on
> nearly
> all of them (I suspect this is a lucky accident).  Since in these
> situations, the TIPC module will not be loaded automatically on
> creation of a TIPC socket, an administrator would have had to
> explicitly load the TIPC kernel module in order for a system to be
> vulnerable.
> 
> I checked Ubuntu, Debian, and Fedora, none of which define an alias.
> Any distributions that define a module alias for TIPC (i.e. "alias
> net-pf-30 tipc") should treat this as a serious vulnerability.  Even
> if your distribution does not, I highly recommend backporting the fix
> for this, since it's a bit of defensive programming in the core
> networking code that handles verifying user-supplied iovecs, which
> likely resolves other undiscovered (or undisclosed) security issues
> elsewhere.  I'll post a link to the fix when it's finalized and
> committed.
> 
> Reference:
> http://marc.info/?l=linux-netdev&m=128770476511716&w=2
> 
> -Dan

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