Date: Thu, 13 Sep 2012 13:31:36 -0600 From: Kurt Seifried <kseifried@...hat.com> To: oss-security@...ts.openwall.com CC: Sebastian Krahmer <krahmer@...e.de>, Tomas Hoger <thoger@...hat.com> Subject: Re: libdbus CVE-2012-3524 fix -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 09/12/2012 08:04 AM, Sebastian Krahmer wrote: > > Hi, > > As the CRD is today, and list policy requires "opening" the > distros-list posting, here is the forward. > > As a quick fix, the exploit can also be mitigated by properly > placing the dbus-launch binary into the expected path, usually > "/bin/dbus-launch", e.g. > > # ln -s /usr/bin/dbus-launch /bin/dbus-launch > > since for some reason, on most dists the binary is mis-placed into > /usr/bin. This makes an execv() fail in libdbus itself, triggering > an execvp(). > > Sebastian > > ----- Forwarded message from Sebastian Krahmer <krahmer@...e.de> > ----- > > > Hi, > > The recently discussed libdbus getenv() issue  turned out to be > easily exploitable on various UNIX systems, including some Linux > distributions. Common attack vectors are Xorg and spice-gtk via > auto-launching . Properly patching requires fixes for libdbus > and libgio, depending on which you link your suid binaries. Would > be nice if someone from RH could forward their patch, as they have > some developers upstream and possibly access to the private git > commit (they also already assigned this CVE). My CRD proposal is > Sept. 12th. As can be seen in , this issue is indeed public > since 1+ year. > > Sebastian > >  https://bugzilla.novell.com/show_bug.cgi?id=697105  > http://stealth.openwall.net/null/dzug.c > > PS: This is a re-send, the first mail to distros list was probably > catched by spam filter. > There is a second vulnerability as well: spice(with naughty env variables)+glib = glib executes "dbus-launch" from USER specific $PATH with elevated privileges. Please use CVE-2012-4425 for this issue. - -- Kurt Seifried Red Hat Security Response Team (SRT) PGP: 0x5E267993 A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://www.enigmail.net/ iQIcBAEBAgAGBQJQUjSYAAoJEBYNRVNeJnmTk4sP+wdzE9/wHfqNVfYVcFmznaVJ L7WpVi6uQ0cLhQJAjePXn5Pd4yTVTFFDsbyeTj5KYOjtm3SFDKkXKP5J35IOh2F5 hISU6tXeraLfBaODyjLrI92v+HaXjBRD0j9yF3NJRTvBrV8XR7zFIO/jPZbfynR0 sWQbEs+kR9HWO3gbovTKNLK5QOz7Q86l9zR7NysFD3NAP4H8oqMcZXkHoRrhsmRd MeovVqtvrV1F1YjPg+XjX3cUx6iKsxhSlBXDCWKsNCgOE8T/8yfoy4N8ySYilp+2 fDf+0dkvieyjYgmQHZikiQqQwGPRSvMbN3SB4wT1Ft81HDWehm9szoL3GVjawTeg nRPDqTEmXGd2FhDSH8QOtEAg/Y6Ju/rLI3CKv1Ee/uupNsX36xZsXvbFdYdTs/bv j8yfCMqiDJwdtEkjRUJODTaiyEffo0NRfzw1v/eQgXNi3EqeO9zbEbCi7iNQpdpj jEwKN4qTx35zV3YtSKV/GXVgzluL3v4X9BzhJmgai7vAw6DbnFaLrzKfRdww0OFK pkaX7dSXrTWLeDKz+/9C6W5o7lubShiZP0/J/db4Dsc/sR5NonJdmqZsDlKW8qDW 75a3LvbSEcaxHqY8qPJjM9tVva8ULU7G5llgkH9w8IUzge+rv7MCC8kET8V9FUrO XLFf6X3InO+8d17jAmZg =4Pz0 -----END PGP SIGNATURE-----
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