Feeds

SSH sniffer attack poses minor risk

Shadow of a doubt

Build a business case: developing custom apps

UK security researchers have discovered hard-to-exploit cryptographic weaknesses in the Secure Shell (SSH) remote administration protocol.

The shortcoming creates a potential means to recover the plain text of encrypted sessions, depending on remote access configurations. Potential attacks - which would take ninja-like hacking skills to pull off - would involve inducing and observing error conditions. It's much more likely that a potential attack would crash a conversation than yield useful results.

Switching the mode of SSH links from block-cipher (CBC) to stream cipher modes would thwart any potential attack, which is confirmed to affect OpenSSH. Commercial versions of SSH are also affected, to an even more modest extent. SSH Communications Security has released an advisory urging users to update its SSH Tectia clients and server software. In the case of SSH Communications, four bits of plain text might be recovered by eavesdropping on conversations on vulnerable systems compared to 32 bits or, more realistically, 14 bits from an arbitrary block of ciphertext on OpenSSH systems.

The cryptographic shortcoming was discovered by researchers at the Information Security Group at Royal Holloway, University of London. More details on the flaw can be found in an advisory from the Centre for the Protection of National Infrastructure (CPNI) here. ®

Next gen security for virtualised datacentres

Whitepapers

Implementing global e-invoicing with guaranteed legal certainty
Explaining the role local tax compliance plays in successful supply chain management and e-business and how leading global brands are addressing this.
Endpoint data privacy in the cloud is easier than you think
Innovations in encryption and storage resolve issues of data privacy and key requirements for companies to look for in a solution.
Scale data protection with your virtual environment
To scale at the rate of virtualization growth, data protection solutions need to adopt new capabilities and simplify current features.
Boost IT visibility and business value
How building a great service catalog relieves pressure points and demonstrates the value of IT service management.
High Performance for All
While HPC is not new, it has traditionally been seen as a specialist area – is it now geared up to meet more mainstream requirements?