Date: Mon, 17 Apr 2017 14:19:24 -0400 From: George Mitchell <george+freebsd@m5p.com> To: freebsd-hackers@FreeBSD.org Subject: Is this a cache poisoning attack? Message-ID: <15f762bd-383b-3545-c300-2b0bc92f2cfd@m5p.com>
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This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --TweOOwuQeS0B9QxHwktndtlPErK1k8CXj Content-Type: multipart/mixed; boundary="WMr1OesIgIiA0vENK5cAcR3fauXi39kiK"; protected-headers="v1" From: George Mitchell <george+freebsd@m5p.com> To: freebsd-hackers@FreeBSD.org Message-ID: <15f762bd-383b-3545-c300-2b0bc92f2cfd@m5p.com> Subject: Is this a cache poisoning attack? --WMr1OesIgIiA0vENK5cAcR3fauXi39kiK Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable I'm getting a plethora of errors like this in my system log, as my sendmail is attempting to validate the domain names of incoming envelope senders of spammers (identifying info deleted): DNS format error from xxx#53 resolving xxx/MX for client xxx:xxx: Name . (SOA) not subdomain of zone xxx -- invalid response FreeBSD 10.3-RELEASE-p18, BIND 9.11.0-P5. Name service seems to be working normally otherwise. Is this a symptom of an attempted cache poisoning attack? -- George --WMr1OesIgIiA0vENK5cAcR3fauXi39kiK-- --TweOOwuQeS0B9QxHwktndtlPErK1k8CXj Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEENdM4ZHktsJW5kKZXwRES3m+p4fkFAlj1BywACgkQwRES3m+p 4fk0Wg/9E45G6vmW8g+jYOZFEqKeNbuLlld8AitB6n9sCosG9XGDfaDXDKIMxNPj cfsgD0KnGolCpxLkJjzMqHwHzj8mf5ICdveBY1WtBjCeMu694WQyKNYyqfP6w638 3bbRFDjGy9jFhvP7AikV5kyaVIp7UZVTHNW9ki89S1mtC1sZq4QDtgonxoyw1lr7 BoilM9DsNd1mYehX1bUwD95sXvMJEKyc4w1S7JmtWTf4CzjqYFVd5uKFq/Bg1QJ5 Vxl0Tu+IhAh9O8SNRHY3lTMNnOMsiL6p4EuhFOglqRq6ueSdLCUSxzqOVBAfrkTW 8lRwxNjOhTcgeXgeB9X8QKVJFPN/vwoO8WvWmjsgW4wB6MRyf0b3jkAoQbfa43Qe +QrE8qv1aMqg0jo0CmGmfSXqwFvjYLX9nKJgZvAe77utrxR9k+HrcgJiSTwDsxCv hxiAs84AUQp8kTu3kSD8RD7tMfJsaw8hGpq5EK0x0cpSlxOcAV8FQcxnT2SngPBW j0zw1+J7nWHUHjxzoE8B/zDjKvq95bDLtlTAbjn06Cil5WJlRw00fQKFA2VZ4LT0 ycVCemFDlRGCSll/n6fTxWWuiIEcgyujP/ZgEmV/GL2UiYmXshXyOB432c5dghUW RPtDgfYtHfyMgK+9hhUQyAgcACwtu56dtjsJKgp1efIHxJn+T88= =zztv -----END PGP SIGNATURE----- --TweOOwuQeS0B9QxHwktndtlPErK1k8CXj--
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