Cys Report Krack Attack Threat Briefing
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Review of the WPA2 Krack Attack. The full research paper that the presentation is based on can be downloaded from here: https://www.krackattacks.com/. You can find my podcast on the iTunes Store CYSReport https://cysreport.com, and my blog is https://debinfosec.com.
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DDoS Attack on DNS using infected IoT Devices
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"Existing techniques for bypassing wired port security are limited to attacking 802.1x-2004, which does not provide encryption or the ability to perform authentication on a packet-by-packet basis [1][2][3][4]. The development of 802.1x-2010 mitigates these issues by using MacSEC to provide Layer 2 encryption and packet integrity check to the protocol [5]. Since MacSEC encrypts data on a hop-by-hop basis, it successfully protects against the bridge-based attacks pioneered by the likes of Steve Riley, Abb, and Alva Duckwall [5][6].
In addition to the development of 802.1x-2010, improved 802.1x support by peripheral devices such as printers also poses a challenge to attackers. Gone are the days in which bypassing 802.1x was as simple as finding a printer and spoofing address, as hardware manufacturers have gotten smarter.
In this talk, we will introduce a novel technique for bypassing 802.1x-2010 by demonstrating how MacSEC fails when weak forms of EAP are used. Additionally, we will discuss how improved 802.1x support by peripheral devices does not necessarily translate to improved port-security due to the widespread use of weak EAP. Finally, we will consider how improvements to the Linux kernel have made bridge-based techniques easier to implement and demonstrate an alternative to using packet injection for network interaction. We have packaged each of these techniques and improvements into an open source tool called Silent Bridge, which we plan on releasing at the conference."
Similar to Cys Report Krack Attack Threat Briefing (20)
DTS Solution - Wireless Security Protocols / PenTesting
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Bypassing Port-Security In 2018: Defeating MacSEC and 802.1x-2010
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みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
ここ3000字までしか入らないけどタイトルの方がたくさん文字入ると思います。
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The introduction of DLAU and the CCB & CCX licensing model caused quite a stir in the HCL community. As a Notes and Domino customer, you may have faced challenges with unexpected user counts and license costs. You probably have questions on how this new licensing approach works and how to benefit from it. Most importantly, you likely have budget constraints and want to save money where possible. Don’t worry, we can help with all of this!
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Programming Foundation Models with DSPy - Meetup Slides
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みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
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Cys Report Krack Attack Threat Briefing
- 3. WPA2 Krack Attack - What Happened? • WPA2 has been broken – Belgian Univ Researchers • “The attack works against all modern protected wifi networks. • Forces nonce reuse on the client • Weakness in the design of the WPA2 protocol in which the client can be forced into reusing a key cysreport.com
- 4. • WPA2 is no longer secure. • Reveals sensitive information such as credit card numbers, passwords, or usernames, and so on. • “Depending on the network configuration, it is also possible to inject and manipulate data. For example, an attacker might be able to inject ransomware or other malware into websites.” WPA2 Krack Attack - What Does This Mean? cysreport.com
- 5. WPA2 Krack Attack - Details • Devastating against Linux and Android 6.0 or higher. Android and Linux can be tricked into (re)installing an all-zero encryption key • If the client uses either the WPA-TKIP or GCMP encryption protocol, instead of AES-CCMP, Nonce reuse enables an adversary to not only decrypt, but also to forge and inject packets. • Note that the attacks do not recover the password of the Wi-Fi network. (any parts of) the fresh encryption key that is negotiated during the 4-way handshake. cysreport.com
- 6. PTK = Session Key WPA2 Krack Attack – The Details Please… cysreport.com
- 7. Krack Attack 4-way handshake 1. AP (Authenticator) sends ANonce to client (supplicant) and client derives the PTK 2. Client sends SNonce to AP and the AP derives the PTK 3. Access Point (AP) will retransmit message 3 if it did not receive an appropriate response as acknowledgment, client resets it nonce and retransmits so hacker has key (Linux and Android zero out key) (Win & IOS don’t accept the retransmission, but are susceptible to the GTK) 4. Malicious AP derives PTK and client installs PTK and GTK Nonce reset PTK PTK GTK cysreport.com
- 8. WPA2 Krack Attack – How to Protect Yourself • Attack is executed against the client • Note: Only access points that support the Fast BSS Transition handshake (802.11r) can be vulnerable, but all clients are vulnerable… Remediation: • Patch all devices phones, tablets, computers, wireless Apps • What if I don’t have a patch for my AP? • Disable client functionality on AP (which is used in repeater modes) • Use a VPN, (not free) recommended: F-Secure Freedome, Cisco Anyconnect • Use TLS when accessing websites cysreport.com
Editor's Notes
- https://www.theguardian.com/technology/2017/oct/16/wpa2-wifi-security-vulnerable-hacking-us-government-warns https://www.darkreading.com/attacks-breaches/factorization-bug-exposes-millions-of-crypto-keys-to-roca-exploit/d/d-id/1330151?_mc=rss_x_drr_edt_aud_dr_x_x-rss-simple
- From 33C3: Analyzing Embedded Operating System Random Number Generators paper http://samvartaka.github.io/cryptanalysis/2017/01/03/33c3-embedded-rngs https://www.krackattacks.com/
- From 33C3: Analyzing Embedded Operating System Random Number Generators paper http://samvartaka.github.io/cryptanalysis/2017/01/03/33c3-embedded-rngs https://www.krackattacks.com/
- From 33C3: Analyzing Embedded Operating System Random Number Generators paper http://samvartaka.github.io/cryptanalysis/2017/01/03/33c3-embedded-rngs
- From 33C3: Analyzing Embedded Operating System Random Number Generators paper http://samvartaka.github.io/cryptanalysis/2017/01/03/33c3-embedded-rngs