[Haifux] Fwd: [CS Colloquium] June 19th at 14:15 Haya Shulman on DNS Cache-Poisoning: New Attacks and Defenses

Orna Agmon Ben-Yehuda ladypine at gmail.com
Mon Jun 17 17:30:58 MSD 2013

---------- Forwarded message ----------
From: Rachel Kolodny <trachel at cs.haifa.ac.il>
Date: Mon, Jun 17, 2013 at 3:04 PM
Subject: [CS Colloquium] June 19th at 14:15 Haya Shulman on DNS
Cache-Poisoning: New Attacks and Defenses
To: colloq <Colloq at cs.haifa.ac.il>

June 19th, Wednesday 14:15, Room 303, Jacobs Building

Title: DNS Cache-Poisoning: New Attacks and Defenses

Lecturer: Haya Shulman

Lecturer homepage :

Affiliation :Department of Computer Science, Bar Ilan University

 The Domain Name System (DNS) is key to the availability and correct
operation of the Internet. Due to its significance it is also a
lucrative target for attacks, most notably for cache poisoning. DNS
cache-poisoning enables attackers to redirect clients to malicious
hosts, allowing distribution of malware, credentials theft, phishing
and spam, web sites defacement, and more.

Cryptographic defenses were designed (DNSSEC), but are not widely
deployed; instead, multiple challenge-response defenses are used.
However, we show how attackers may be able to circumvent those
defenses and poison in spite of them; specifically:

- Circumvent source port randomisation, in the (common) case where the
resolver connects to the Internet via different NAT devices.

- Circumvent IP address randomisation supported by standard-conforming

- Circumvent query randomisation, including both randomisation by
prepending a random nonce and case randomisation (0x20 encoding).

We present countermeasures preventing our attacks; however, we
advocate that only correct adoption of cryptographic security such as
DNSSEC, can prevent the cache-poisoning attacks, and discuss the
challenges and status of DNSSEC deployment.

Joint work with Amir Herzberg.
Colloq mailing list
Colloq at cs.haifa.ac.il

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Orna Agmon Ben-Yehuda.
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