Feeds

LAND attack threat 'not significant', says Microsoft

French alert doesn't stack up to much, apparently

  • alert
  • submit to reddit

Using blade systems to cut costs and sharpen efficiencies

Microsoft has rejected the seriousness of a security warning about its software. On Tuesday the French Security Incident Response Team (FrSIRT) issued an alert about a security bug in Microsoft's implementation of TCP/IP in Windows XP and 2003.

The flaw in the Windows IPv6 TCP/IP stack means systems are liable to crash when processing maliciously crafted packets in which the SYN flag is set, and the source address and port are the same as the destination address and port (a so-called Land Attack). FrSIRT said that even systems running the latest, fully patched versions of XP SP2 or Win 2003 SP1 could be crashed using an attack based on the vulnerability.

Microsoft disputes this point, arguing that customer running XP SP2 or Win 2003 SP1 or those who'd applied a patch release in April (MS05-019) are protected. No customers have reported attacks based on the reported vulnerability, it says. "We do not consider this to be a significant threat to the security of the Internet. This is similar to other TCP connection reset issues," it said in an advisory published Wednesday, 18 May.

According to FrSIRT, Microsoft's April fix only addresses a variant of the latest vulnerability, an IPv4 Land attack risk, not the IPv6 attack that formed the subject of its Tuesday alert. It advises corporates to filter potentially malicious traffic at the firewall pending a more comprehensive fix. ®

Related stories

Microsoft unveils details of software security process
Microsoft hunts web nasties with honey monkeys
Networks on yellow alert over ICMP flaw
Eight patches - five critical - in MS April patch batch

Boost IT visibility and business value

More from The Register

next story
14 antivirus apps found to have security problems
Vendors just don't care, says researcher, after finding basic boo-boos in security software
Secure microkernel that uses maths to be 'bug free' goes open source
Hacker-repelling, drone-protecting code will soon be yours to tweak as you see fit
Only '3% of web servers in top corps' fully fixed after Heartbleed snafu
Just slapping a patched OpenSSL on a machine ain't going to cut it, we're told
How long is too long to wait for a security fix?
Synology finally patches OpenSSL bugs in Trevor's NAS
Israel's Iron Dome missile tech stolen by Chinese hackers
Corporate raiders Comment Crew fingered for attacks
Roll out the welcome mat to hackers and crackers
Security chap pens guide to bug bounty programs that won't fail like Yahoo!'s
HIDDEN packet sniffer spy tech in MILLIONS of iPhones, iPads – expert
Don't panic though – Apple's backdoor is not wide open to all, guru tells us
Researcher sat on critical IE bugs for THREE YEARS
VUPEN waited for Pwn2Own cash while IE's sandbox leaked
prev story

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.
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.
Application security programs and practises
Follow a few strategies and your organization can gain the full benefits of open source and the cloud without compromising the security of your applications.
How modern custom applications can spur business growth
Learn how to create, deploy and manage custom applications without consuming or expanding the need for scarce, expensive IT resources.
Securing Web Applications Made Simple and Scalable
Learn how automated security testing can provide a simple and scalable way to protect your web applications.