Date: Mon, 2 Nov 2015 02:37:08 -0600 From: Austin English <austinenglish@...il.com> To: cve-assign@...re.org, Austin English <austinenglish@...il.com>, oss-security@...ts.openwall.com Subject: Re: Re: CVE request for wget The fix has been released in 1.7-rc1, https://tails.boum.org/news/test_1.7-rc1/index.en.html On Mon, Oct 26, 2015 at 3:21 PM, Austin English <austinenglish@...il.com> wrote: > On Thu, Oct 1, 2015 at 6:10 PM, Seth Arnold <seth.arnold@...onical.com> > wrote: > > On Thu, Oct 01, 2015 at 06:57:26PM -0400, cve-assign@...re.org wrote: > >> If there is any additional Tails vulnerability related to this, > >> another CVE ID may be needed. For example, > >> > >> https://lists.gnu.org/archive/html/bug-wget/2015-08/msg00050.html > >> > >> says > >> > >> to be 100% sure, you should add --passive-ftp to your command line. > >> If you don't do that, your /etc/wgetrc or ~/.wgetrc could include > >> --no-passive-ftp (or passiveftp = off). > >> > >> If Tails is supposed to try to ensure that, perhaps there's a > >> requirement to have something like: > >> > >> alias wget="wget --passive-ftp" > >> > >> in a system-wide location (possibly /etc/bash.bashrc). The concept of > >> CVE IDs for "failure of a torify step" issues is new, and we aren't > >> sure of the best approach. > > > > I suspect using a bash alias in a site-wide config might then qualify for > > another CVE in the future, along the lines of "programs that spawn wget > > via system(3), popen(3), or exec family of functions can use unsafe > active > > mode by accident". If Tails is in the business of fixing these things > > for safety, removing active ftp support from tools seems like better fix. > > > > Thanks > > A fix has been applied to Tails git: > > https://labs.riseup.net/code/projects/tails/repository/revisions/b9fd6312435d55dd0bc0b6abdb7994da4d66e2b2 > > In short, the wget binary is moved to /usr/lib/wget/wget, and a > wrapper script is put in place in /usr/bin/wget. The wrapper ensures > that wget is called via torsocks, and additionally, also forces > --passive-ftp. > > Moving wget to /usr/lib/wget/wget gets the potentially dangerous wget > binary out of $PATH. A dedicated attacker could check if /usr/bin/wget > is a script and then parse it to find the actual binary, but that > would need to be a very dedicated attacker and at that point, there > are more feasible attacks available. > > -- > -Austin > -- -Austin
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