Date: Fri, 14 Oct 2011 12:13:39 +0400 From: Vasiliy Kulikov <segoon@...nwall.com> To: oss-security@...ts.openwall.com Subject: Re: radvd 1.8.2 released with security fixes Hi Huzaifa, On Fri, Oct 14, 2011 at 10:15 +0530, Huzaifa Sidhpurwala wrote: > I dont think so. From the code i have read so far, here is what > seems to happen. > > - radvd starts as root > - reads the configs > - if a username is specified (user=radvd in most cases): > - if "--singleprocess" is not specified: > - run privsep_init(): This forks another process which > runs as root. So after this point we have two > processes both running as root > - If privsep_init() fails, we have just one process > running as root > - run drop_root_privileges(): > If this succedes, we have two processes one running as > root and another as radvd user, or if privsep_init() > failed earlier, we have one process running as radvd > user. > If this fails, application quits > - If username was not specified radvd continues to run as a single > process as root. > > > So failure in privsep_init() results in just one process running as > radvd user. If it did not fail it would result in one process > running as root and another as radvd user. > > I dont think this would be a security issue in my opinion. Indeed, if privsep_init() fails the only visible change would be no future changes to interface settings. I was misled by the option name - it looks like privsep disabling (opposition to --username), but in reality it totally disables privileged operations. Thanks for spotting it, I think CVE-2011-3603 should be rejected. -- Vasiliy
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