oss-security - Re: CVE request (and disclosure): ax25d missing setuid return code check

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Date: Thu, 11 Aug 2011 14:13:23 +0200
From: Thomas Osterried <thomas@...erried.de>
To: Eren Türkay <eren@...dus.org.tr>
Cc: oss-security@...ts.openwall.com, Ralf Baechle <ralf@...ux-mips.org>,
        Thomas Osterried <ax25@...erg.in-berlin.de>
Subject: Re: CVE request (and disclosure): ax25d missing setuid return code check

Hello,

Am Donnerstag, den 11. August 2011 um 07:20:41 Uhr, schrieb Eren Türkay <eren@...dus.org.tr> in <20110811052041.GB2043@...t-is@...some>:
> On Tue, Aug 09, 2011 at 11:33:04PM -0400, Dan Rosenberg wrote:
> > The AX.25 daemon (ax25d), typically provided in the ax25-tools
> > package, allows administrators to associate incoming AX.25, NET/ROM,
> > and ROSE traffic with the execution of an endpoint program (most
> > commonly "node"), which is run under a specified user account.
> > Because ax25d is missing a check on the return code for a setuid call
> > responsible for dropping privileges to the specified user, it may be
> > possible to cause setuid to fail, after which the chosen program will
> > be executed with root privileges.  In other words, if you're in the
> > business of handing out unprivileged shells over amateur radio (don't
> > we all? :p ), this would allow for remote compromise.
> 
> Hello,
> 
> Thank you for your investigation on the topic. Although this issue seems
> to be low-priority, it's good to let the maintainers know.
> 
> I'm CCing Ralf Baechle, and Thomas Osterried who, accordingly to
> linux-ac25 site, are the maintainers of ax25 utilities.

thank you for your information.

I know that code fragment, but I never imagined that if root calls setuid/setgid that this could fail, because root has by definition enough rights.

We'l corect lines 617-619 asap.

Kind regards,
	- Thomas  dl9sau

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