Researchers have discovered vulnerabilities in a series of virtualisation software platforms that allow attackers to gain unauthorised access.
The holes could be exploited to achieve local privileged escalation and virtual machine escapes on software from vendors Xen, FreeBSD, Microsoft, and RedHat running on 64-bit operating systems on Intel processors.
Invisible Things Lab principle researcher Rafal Wojtczuk discovered the flaws, which he said allowed a ring3 attacker to craft a stack frame to be executed by the kernel after a general protection exception.
US CERT’s Jared Allar issued an alert stating that “the fault will be handled before the stack switch, which means the exception handler will be run at ring0 with an attacker's chosen RSP causing a privilege escalation”.
VMware and AMD processors were not affected.
Users were urged to apply vendor patches. More detail is available on the US CERT advisory.
Wojtczuk detailed the following ring3 attack steps:
Copyright © SC Magazine, Australia
Issue: 329 | July 2014
Access CRN's extensive online resources including; email bulletins, community discussions and unique online news.
Processing registration... Please wait.
This process can take up to a minute to complete.
A confirmation email has been sent to your email address - SUPPLIED GOES EMAIL HERE. Please click on the link in the email to verify your email address. You need to verify your email before you can log on to the CRN website or start posting comments on articles.
If you do not receive your confirmation email within the next few minutes, it may be because the email has been captured by a junk mail filter. Please ensure you add the domain '@crn.com.au' to your white-listed senders.