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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