As anyone in the internet security world knows, there are a number of threats operating at the same time. In fact, the sheer number of exploits is now reaching the highest level ever. In the realm of modern exploits, SpectreRSB remains a serious threat to the average operating system. Find out more about SpectreRSB attacks and how to overcome one.
Little Bit About Spectre
is an older type of exploit that attached to the speculative
execution mechanism. This function is found in many of today’s
processors. At some point, Spectre attacks were thought to be a thing
of the past. However, these types of exploits were reborn in the form
of SpectreRSB. This new version of Spectre attempts to exploit the
Return Stack Buffer (RSB) to facilitate the attack.
has existed in many different forms over the past year or so. It
started off with variants one and two, which were quickly resolved.
Then, Spectre versions 1.1 and 1.2 hit the scene. Finally, the RSB
version was detected. This is the current version which is still in
Details About the Exploit
presence of speculative execution is what makes this exploit
possible. Speculative executions help CPUs maximize their speed by
operating a set of batch instructions. During this process, there is
no fail-safe to ensure that the memory accessed from the cache has
the appropriate privileges. Therefore, a loophole is available where
the RSB version can take hold. Specifically, the RSB Spectre uses the
Return Stack Buffer, hence the name.
organization that uses RSB for return address prediction needs to set
up a defense. The best solution available at the current time is a
process called RSB refilling. This works by filling the address with
that of a non-relevant device to prevent inappropriate speculation.
By refilling, the entries for the return address are overwritten.
This prevents the attacker from getting access to the compromised
address. Doing so effectively negates the attacker’s efforts.
Prepared for the Future
the above section details a way to combat RSB attacks, you should not
rest assured. Attacks will continue to come in all shapes and sizes.
To be totally prepared, you need to check every possible avenue for
For assistance around the San Jose, CA area, contact Virsec Systems at virsec.com.
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