Feeds

Severe bug deadlocks BIND

DNS lookup system peril

Beginner's guide to SSL certificates

Developers have published a fix to tackle a high-risk flaw in BIND, the widely used Domain Name Services (DNS) software. The flaw creates a potential mechanism for miscreants to crash systems running vulnerable version of the name-to-IP-address translation software.

Left unaddressed, the vulnerability can provide a means to cause BIND servers to deadlock and stop processing requests. Authoritative name servers can be pushed into a deadlock condition when processing incremental zone transfer (IXFR) updates. These updates deal with recent changes in DNS records, with unchanged records omitted to save bandwidth and processing power.

An advisory by the Internet Systems Consortium (ISC) explains: "When an authoritative server processes a successful IXFR transfer or a dynamic update, there is a small window of time during which the IXFR/update coupled with a query may cause a deadlock to occur.

"This deadlock will cause the server to stop processing all requests. A high query rate and/or a high update rate will increase the probability of this condition."

Attacks on the authoritative name servers that underpin the net's "yellow page" system have the potential to severely disrupt internet surfing, even though those users could still reach websites by using the IP address instead of name of the site they wanted to reach.

The flaw – discovered by net software firm Neustar – affects BIND version 9.7.1 and 9.7.2. Neither earlier versions of BIND nor BIND 9.8 are vulnerable.

No exploits against the vulnerability exist, but sysadmins are still being urged to update to BIND version 9.7.3, which addresses the flaw. ®

Security for virtualized datacentres

More from The Register

next story
New 'Cosmos' browser surfs the net by TXT alone
No data plan? No WiFi? No worries ... except sluggish download speed
'Windows 9' LEAK: Microsoft's playing catchup with Linux
Multiple desktops and live tiles in restored Start button star in new vids
iOS 8 release: WebGL now runs everywhere. Hurrah for 3D graphics!
HTML 5's pretty neat ... when your browser supports it
'People have forgotten just how late the first iPhone arrived ...'
Plus: 'Google's IDEALISM is an injudicious justification for inappropriate biz practices'
Mathematica hits the Web
Wolfram embraces the cloud, promies private cloud cut of its number-cruncher
Mozilla shutters Labs, tells nobody it's been dead for five months
Staffer's blog reveals all as projects languish on GitHub
SUSE Linux owner Attachmate gobbled by Micro Focus for $2.3bn
Merger will lead to mainframe and COBOL powerhouse
iOS 8 Healthkit gets a bug SO Apple KILLS it. That's real healthcare!
Not fit for purpose on day of launch, says Cupertino
Not appy with your Chromebook? Well now it can run Android apps
Google offers beta of tricky OS-inside-OS tech
prev story

Whitepapers

Secure remote control for conventional and virtual desktops
Balancing user privacy and privileged access, in accordance with compliance frameworks and legislation. Evaluating any potential remote control choice.
WIN a very cool portable ZX Spectrum
Win a one-off portable Spectrum built by legendary hardware hacker Ben Heck
Intelligent flash storage arrays
Tegile Intelligent Storage Arrays with IntelliFlash helps IT boost storage utilization and effciency while delivering unmatched storage savings and performance.
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?
Beginner's guide to SSL certificates
De-mystify the technology involved and give you the information you need to make the best decision when considering your online security options.