Date: Wed, 21 Nov 2001 14:46:34 -0500 From: The Anarcat <anarcat@anarcat.dyndns.org> To: airot@lazir.toya.net.pl Cc: FreeBSD Security Issues <FreeBSD-security@FreeBSD.ORG> Subject: Re: fun with pkg_add Message-ID: <20011121194634.GB69296@shall.anarcat.dyndns.org> In-Reply-To: <Pine.LNX.4.33.0111212032370.22602-100000@lazir.toya.net.pl> References: <20011121191808.GD44370@shall.anarcat.dyndns.org> <Pine.LNX.4.33.0111212032370.22602-100000@lazir.toya.net.pl>
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--0eh6TmSyL6TZE2Uz Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed Nov 21, 2001 at 08:38:06PM +0100, airot@lazir.toya.net.pl wrote: >=20 >=20 > On Wed, 21 Nov 2001, The Anarcat wrote: >=20 > > Hi! > > > > I just noticed something that could be a problem with pkg_add > > algorithms. When it installs a package, it first untars it in a > > temporary directory. The problem is that the subdirectories of the > > package created this way are world-writable: > > > > $ ftp -a ftp://ftp.freebsd.org/pub/FreeBSD/ports/packages/All/auctex-10= .0g.tgz > > $ pkg_add auctex-10.0g.tgz > > ^Z > ^Z is SIGTSTP it susspend prcoesses, there is a very small posibilty that > our 'attacker' will change somthing when you are installing package. ;-) Wrong. With large packages such as XFree86, the untarring actually takes a few minutes, sometimes, and thus leave a large window of attack. > I didn`t check the /var/tmp/inst* directory permissions, but i guess it`s > imposible to exploit this security issue. Again, I do not agree, as I have exploited this security issue. It might be related to some misconfiguration on my side (but I doubt it), and it is why I sent this to the list first, to get some confirmation of the bug. A. --0eh6TmSyL6TZE2Uz Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (FreeBSD) Comment: For info see http://www.gnupg.org iEYEARECAAYFAjv8BJkACgkQttcWHAnWiGeaowCeLHroQl3psl6x45uuAglEXYR+ JHAAn3O8j4WknM7fw4/p9e8Zw4KYAjhb =vcth -----END PGP SIGNATURE----- --0eh6TmSyL6TZE2Uz-- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message
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