Gather Data Sampling (GDS) impacts select Intel CPUs, enabling attackers to deduce outdated data through malicious use of gather instructions. While all these entries link to the prior thread or sibling core registers.
Like MDS, GDS (Gather Data Sampling) enables local code execution to reveal protected secret data. GDS is different from MDS as it exposes only stale vector register data through specific gathering instructions, lacking user choice in suspected data.
Cybersecurity researcher Daniel Moghimi at Google recently crafted a ‘Downfall’ CPU attack that enables threat actors to extract the following data from Intel chips shared by users:-
Cybersecurity researchers tracked this vulnerability as CVE-2022-40982, and this flaw affects the Skylake to Ice Lake chips from Intel with transient execution side-channel issues.
By exploiting this vulnerability, a threat actor can easily retrieve the protected sensitive data through Intel’s SGX, which segregates the code and memory.
Besides this, the SGX exclusively aids the server CPUs which enables it to establish a secure enclave that is inaccessible even by the OS itself.
Moreover, Daniel Moghimi revealed the exploitative nature of Downfall, under which this flaw exploits the gathered instructions for a speculative leak of vector register content.
Moghimi seized AES keys through GDS across VMs, even from cores’ sibling threads. In under 10s, 8 bytes at a time, the researcher fused stolen AES round keys to crack encryption.
However, apart from this, the researcher leveraged the undisclosed techniques in this scenario on powerful CPUs to breach data barriers between:-
Failed tries prompted repeated attacks, as the master key data was infrequent within 10 seconds. Moghimi offers diverse GDS attacks, snatching varied data due to specific SIMD buffer conditions.
Downfall needs attacker presence on the victim’s physical core, facilitated by current shared computing.
Local malware might exploit it, and besides this, Intel already acknowledged the flaw with Moghimi in August, issuing a microcode fix.
Vulnerability remained undisclosed for nearly a year, allowing OEMs and CSPs to validate fixes.
But, Intel affirms that Alder Lake, Raptor Lake, and Sapphire Rapids series were not affected, as the Downfall affects the following CPU families:-
In this case, to leak data, Daniel Moghimi exploited the REDACTED on high-performance REDACTED CPUs by breaching the user-kernel boundaries across systems.
Here below, we have mentioned all the recommendations from Intel:-
Keep informed about the latest Cyber Security News by following us on GoogleNews, Linkedin, Twitter, and Facebook.
A very important message from the Norwegian National Cyber Security Centre (NCSC) says that Secure Socket Layer/Transport Layer Security (SSL/TLS)…
Linux is widely used in numerous servers, cloud infrastructure, and Internet of Things devices, which makes it an attractive target…
ViperSoftX malware, known for stealing cryptocurrency information, now leverages Tesseract, an open-source OCR engine, to target infected systems, which extracts…
Santander has confirmed that there was a major data breach that affected its workers and customers in Spain, Uruguay, and…
The U.S. government has offered a prize of up to $5 million for information that leads to the arrest and…
Russia leverages a mix of state-backed Advanced Persistent Threat (APT) groups and financially motivated cybercriminals to achieve its strategic goals,…