[SECURITY] [DSA 1605-1] DNS vulnerability impact on the libc stub resolver

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Debian Security Advisory DSA-1605-1 [email protected]
http://www.debian.org/security/ Florian Weimer
July 08, 2008 http://www.debian.org/security/faq

Package : glibc
Vulnerability : DNS cache poisoning
Problem type : remote
Debian-specific: no
CVE Id(s) : CVE-2008-1447
CERT advisory : VU#800113

Dan Kaminsky discovered that properties inherent to the DNS protocol
lead to practical DNS spoofing and cache poisoning attacks. Among
other things, successful attacks can lead to misdirected web traffic
and email rerouting.

At this time, it is not possible to implement the recommended
countermeasures in the GNU libc stub resolver. The following
workarounds are available:

1. Install a local BIND 9 resoler on the host, possibly in
   forward-only mode. BIND 9 will then use source port randomization
   when sending queries over the network. (Other caching resolvers can
   be used instead.)

2. Rely on IP address spoofing protection if available. Successful
   attacks must spoof the address of one of the resolvers, which may not
   be possible if the network is guarded properly against IP spoofing
   attacks (both from internal and external sources).

This DSA will be updated when patches for hardening the stub resolver
are available.

For apt-get: deb http://security.debian.org/ stable/updates main
For dpkg-ftp: ftp://security.debian.org/debian-security dists/stable/updates/main
Mailing list: [email protected]
Package info: `apt-cache show <pkg>' and http://packages.debian.org/&lt;pkg&gt;
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.6 (GNU/Linux)

iQEVAwUBSHOIFr97/wQC1SS+AQIscwf+KBKMT4hcpB5TCNE+0v1DNBHiQ4rh7ktz
KiOyLWEJOaxOrpsR8siA6B6newiLe5KfwojDikqSCXbubTCeicj79HTCx5DzzhTm
aa3HePARxmtN1AuyFCebOfklibTtyY/gpwydCdAVBiV0+LmD+jXy9Jx4AfyuibXZ
VaqkUTj5sUUQn5CacdI1zc1Ky1rzbzRBBoNJ1D1rRBU1wjoGsvVjBV9p24j/1E2c
mYtbY3g1FKmhnOTLBac/AAW62ZQ44yf4QcGgwV8CULfi5c2QmGiRYZioWDVd0pfZ
hr2h/Vmjs2qgf8B9FmYet0hEGm6SrEryT2ievlqXkpul0MYtHjJ5iw==
=CMHb
-----END PGP SIGNATURE-----