Feeds

OpenSSH hits the fan

Get patching!

  • alert
  • submit to reddit

The essential guide to IT transformation

A serious vulnerability in default installation of OpenSSH on the OpenBSD operating system has come to light.

A vulnerability exists within the "challenge-response" authentication mechanism in the OpenSSH daemon (sshd), according to an alert issued today by Internet Security Systems.

This mechanism, part of the SSH2 protocol, verifies a user's identity by generating a challenge and forcing the user to supply a number of responses.

However this mechanism is flawed in OpenSSH version 3.3 - it's possible for a remote attacker to send a specially-crafted reply that triggers an overflow.

According to ISS, this can result in a remote denial of service attack on the OpenSSH daemon or a complete remote compromise. The OpenSSH daemon runs with superuser privilege, so remote attackers can gain superuser access.

Worse still, the vulnerability is being "actively exploited".

ISS recommends upgrade to OpenSSH version 3.4 immediately. As a workaround, BOFHs might also consider disabling unused OpenSSH authentication mechanisms.

OpenSSH is a free version of the SSH (Secure Shell) communications suite and is used as a secure replacement for protocols such as Telnet, Rlogin, Rsh, and Ftp.

You can find more information about the problem here, and details of vendors which implement OpenSSH here. ®

5 things you didn’t know about cloud backup

More from The Register

next story
Goog says patch⁵⁰ your Chrome
64-bit browser loads cat vids FIFTEEN PERCENT faster!
Chinese hackers spied on investigators of Flight MH370 - report
Classified data on flight's disappearance pinched
KER-CHING! CryptoWall ransomware scam rakes in $1 MEEELLION
Anatomy of the net's most destructive ransomware threat
NIST to sysadmins: clean up your SSH mess
Too many keys, too badly managed
Scratched PC-dispatch patch patched, hatched in batch rematch
Windows security update fixed after triggering blue screens (and screams) of death
Researchers camouflage haxxor traps with fake application traffic
Honeypots sweetened to resemble actual workloads, complete with 'secure' logins
prev story

Whitepapers

Gartner critical capabilities for enterprise endpoint backup
Learn why inSync received the highest overall rating from Druva and is the top choice for the mobile workforce.
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.
Rethinking backup and recovery in the modern data center
Combining intelligence, operational analytics, and automation to enable efficient, data-driven IT organizations using the HP ABR approach.
Consolidation: The Foundation for IT Business Transformation
In this whitepaper learn how effective consolidation of IT and business resources can enable multiple, meaningful business benefits.
Next gen security for virtualised datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.