Cisco Patches IOS in Response to Boffins' IKE-Busting Breakthrough
Switchzilla issues update for authentication bypass flaw
Cisco has pushed out an update for its internetwork operating system (IOS) and IOS XE firmware in advance of a Usenix presentation on circumventing cryptographic key protocol.
The networking behemoth is advising all customers running hardware that uses IOS and IOS XE to get the updates that address CVE-2018-0131, a security bypass vulnerability stemming from a weakness in the Internet Key Exchange (IKEv1) protocol.
Researchers Dennis Felsch, Martin Grothe, Jörg Schwenk, Adam Czubak, and Marcin Szymanek from Ruhr-University Bochum and University of Opole found [PDF] that an attacker could contact a device with ciphertext requests that, under the right circumstances, could cause the target device to disclose the encrypted nonces (single-use numbers for encryption keys) and potentially lead to the keys being broken.
The group, who plan to share their findings later this week at the conference, wrote that "reusing a key pair across different versions and modes of IKE can lead to cross-protocol authentication bypasses, enabling the impersonation of a victim host or network by attackers."
The attack would potentially be carried out either by eavesdropping on IP sessions or by performing a man-in-the-middle compromise and injecting code into packets.
The researchers say that, by deliberately sending bad cipher requests to the vulnerable machines, they could receive enough data to create a type of Bleichenbacher's Oracle [PDF] attack on the keys. This would, given enough time, would potentially allow the attacker to decrypt shared keys and get around encryption protections.
The researchers noted that they have already disclosed their findings to Cisco and other vendors impacted by the issue, and all are believed to have issued patches for vulnerable products prior to the publication of the paper.
Cisco says in its advisory that, short of moving off of IKEv1, there are no workarounds for the vulnerability. Switchzilla is advising anyone using an IOS or IOS XE device that is configured with the 'authentication rsa-encr' option turned on to update their firmware and make sure they have the patched IOS version.
The latest available version will vary based on device and model, but in general IOS versions 15.5(3)M7.2 and later will be protected.
- Head of Penetration Testing
- United Kingdom
Head of Penetration Testing needed to join a security consultancy that are delivering client facing penetration testing services around Web app and Infrastructure. Looking for someone hands on that is able to manage a highly skilled technical team of testers. 50-60% of the time is expected to be hands on, other duties will include, but not be limited to; leading and managing the day to day running of the team, mentoring, team upskill, recruitment, reporting, escalation, process improvement etc. Flexible location although south east is preferred. Anyone with Check / CREST experience is highly desirable. MUST be able to achieve SC clearance. UK based role. All details kept in confidence.
- CONTRACT SOC Manager. London / Birmingham. URGENT Immediate role.
REF7847 Contract SOC Manager. SC cleared, London / Birmingham. Initial 3 month Contract. SOC Manager needed to for an URGENT 3-4 month CONTRACT. SC clearance is essential. The project is to aid in the setup, implementation and management of resources to help with the initial stand up stages of a new SOC within a greenfield site. This is a short term contract role whilst a permanent hire is brought on over the coming 3 to 4 months. Experience engaging with and managing client stakeholder relationships as well as 3rd party relationships is critical. The role will involve; setting up, implementing and fine tuning the various initial stages of a SOC environment. Experience establishing and building out technical process / operational capability, managing of technical teams (analysts, engineers and architects, creation of policy / playbooks, fine turning is key. SPLUNK is the tooling of choice… Interviewing immediately. Set up a call with me today on https://calendly.com/chris-holt/arranged-call-with-chris-holt-remote-soc-role Direct contact details Chris.Holt@dclsearch.com or 07884666351
- SPLUNK Level 3 SOC Consultant, SIEM Splunk, London / Birmingham
REF CH7825 Level 3 SOC Consultant, SIEM Splunk, London / Birmingham £55,000 + Level 3 SOC Consultant, SIEM SPLUNK needed. Security Clearance. Permanent role Level 3 SOC Consultant, SIEM SPLUNK needed to join a public sector client. The ability to achieve SC clearance is essential. MUST have experience working with SPLUNK ideally to an Advanced Power User level. Splunk Enterprise Security (ES) knowledge and hands on experience highly desirable. The role will include, but not be limited to; managing and handling incidents end to end, supporting and mentoring level 1 / level 2 staff, supporting the SOC manager in the delivery of the SOC roadmap, engaging with the client stakeholders (other technical teams) as and where needed, use case development, advanced search and reporting etc. The individual MUST currently be living in the UK and be able to achieve UK security clearance. (SC) This is a permanent role To arrange a call with Chris Holt use this calendy link https://calendly.com/chris-holt/arranged-call-with-chris-holt-remote-soc-role Chris.Holt@dclsearch.com
- Aspiring Cyber Partner. Business lead, market maker.
Aspiring Cyber Partner (management consultancy) with Cyber specialism into Healthcare, Utilities and or Public Sector. Working with new and existing clients to help them solve, transform or evolve their cyber capabilities. MUST have; A proven management consultancy background in cyber. A history of identifying and closing new business opportunities. Currently Revenue generating / must be able to demonstrate recent wins. Client facing to board level with international businesses. Team leadership / mentoring experience. Extensive cyber industry experience. Digital transformation, Start-up environments etc. Experienced presenter at industry events, to be the public face of a business / capability. Breadth of knowledge across Cyber security. Service definition / creation. Would consider a senior director with experience delivering the above looking to step up. All conversations kept in confidence. To arrange a discreet call book a time to speak in my diary via https://calendly.com/chris-holt/cyber-partner-call Chris.Holt@dclsearch.com