Date: Fri, 3 Apr 2015 11:51:58 +0700 From: Рысь <lynx@...server.ru> To: musl@...ts.openwall.com Subject: Re: Re: Busybox on musl is affected by CVE-2015-1817 On Thu, 2 Apr 2015 20:36:27 +0200 u-wsnj@...ey.se wrote: > On Fri, Apr 03, 2015 at 12:26:56AM +0700, Рысь wrote: > > Audit your filesystem and remove all > > setuid bits from all programs, move/rename them as prog.real and > > place a shell script in place which will call setuid wrapper which > > then will setreuid(uid, 0) then execve(). > > This way you are still exposed to setuid and also still depend on how > the prog.real is going to use the supplied credentials. You more or > less have to reimplement in your wrapper the checks expected "to be > already present" in the program, without any control over its > internals. If talking about ping issue then yes, ping and other such programs must not even start to process user input when not sure. You've got setuid -- quickly drop it when needed privileged resource is obtained. Tools just need to be fixed, without surrounding scream and initiating another security dances which usually only hurt. Instead of wrapper there maybe limiting group which members can run program, but Unix credentials were always somewhat limited and at some point you understand that without certain things like ACLs or sudo you can't effectively partition privileges. > > This can certainly improve the situation if you are (which presumably > is the case) more security-oriented and thoughtful than the upstream > developer, but you are in an uphill battle. > > For me this does not look like a solution, rather like a patchwork > which may or may not be effective. > > Rune >
Powered by blists - more mailing lists
Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.