The Bug Report November 2021 Edition

The Bug Report — November 2021 Edition By Mark Bereza · November 30, 2021 Your Cybersecurity Comic Relief CVE-2021-20322: Of all the words of mice and men, the saddest are, “it was DNS again.” Why am I here? For all our newcomers, welcome to the Advanced Threat Research team’s monthly bug report ...

The vulnerability of the internal protection mechanism for the target string (TRR) of DRAM devices (PC-DDR4, LPDDR4X) allows attackers to enhance their privileges.

The vulnerability of the internal protection mechanism for the target string TRR in DRAM devices PC-DDR4, LPDDR4X relates to the possibility of manipulating the contents of individual memory bits through cyclic reading from memory cells. Exploiting this vulnerability can allow an attacker to...

CVE-2021-26337

Insufficient DRAM address validation in System Management Unit SMU may result in a DMA read from invalid DRAM address to SRAM resulting in SMU not servicing further requests...

CVE-2021-26337

Insufficient DRAM address validation in System Management Unit SMU may result in a DMA read from invalid DRAM address to SRAM resulting in SMU not servicing further requests...

Authorization

Insufficient DRAM address validation in System Management Unit SMU may result in a DMA read from invalid DRAM address to SRAM resulting in SMU not servicing further requests...

CVE-2021-26337

Insufficient DRAM address validation in System Management Unit SMU may result in a DMA read from invalid DRAM address to SRAM resulting in SMU not servicing further requests...

CVE-2021-26337

The CVE-2021-26337 issue is an AMD SMU (System Management Unit) DRAM address validation flaw. It can permit a DMA read from an invalid DRAM address into SRAM, causing the SMU to stop servicing further requests. Mitigations are provided by AMD/AGSIA: update to the specified AGESA PI software versi...

CVE-2021-26338

Improper access controls in System Management Unit SMU may allow for an attacker to override performance control tables located in DRAM resulting in a potential lack of system resources...

Improper access control

Improper access controls in System Management Unit SMU may allow for an attacker to override performance control tables located in DRAM resulting in a potential lack of system resources...

CVE-2021-26338

The CVE targets AMD's System Management Unit (SMU) in AMD EPYC processors (1st–3rd Gen) where improper access controls may allow an attacker to override DRAM performance-control tables, risking resource exhaustion. Affected components/versions are stated in AMD’s bulletin AMD-SB-1021 (AGESA mitig...

New Blacksmith Exploit Bypasses Current Rowhammer Attack Defenses

Cybersecurity researchers have demonstrated yet another variation of the Rowhammer attack affecting all DRAM dynamic random-access memory chips that bypasses currently deployed mitigations, thereby effectively compromising the security of the devices. The new technique — dubbed "Blacksmith"...

CVE-2021-42114

A Rowhammer flaw was found in the latest DDR4 DRAM hardware chips. This flaw is different from the previously known attack CVE-2020-10255 by non-uniform patterns of memory access. These DDR4 DRAM hardware chips implement a Target Row Refresh TRR mitigation to prevent a Rowhammer flaw-induced bit...

CVE-2021-42114

Modern DRAM devices PC-DDR4, LPDDR4X are affected by a vulnerability in their internal Target Row Refresh TRR mitigation against Rowhammer attacks. Novel non-uniform Rowhammer access patterns, consisting of aggressors with different frequencies, phases, and amplitudes allow triggering bit flips o...

Privilege escalation

Modern DRAM devices PC-DDR4, LPDDR4X are affected by a vulnerability in their internal Target Row Refresh TRR mitigation against Rowhammer attacks. Novel non-uniform Rowhammer access patterns, consisting of aggressors with different frequencies, phases, and amplitudes allow triggering bit flips o...

CVE-2021-42114 Scalable Rowhammering In the Frequency Domain to Bypass TRR Mitigations On Modern DDR4/LPDDR4X Devices

Modern DRAM devices PC-DDR4, LPDDR4X are affected by a vulnerability in their internal Target Row Refresh TRR mitigation against Rowhammer attacks. Novel non-uniform Rowhammer access patterns, consisting of aggressors with different frequencies, phases, and amplitudes allow triggering bit flips o...

CVE-2021-42114

CVE-2021-42114 (Blacksmith) affects modern DRAM (PC‑DDR4, LPDDR4X) where TRR mitigations can be bypassed by non‑uniform memory access patterns. ETH Zurich et al. demonstrated a fuzzer (Blacksmith) that triggered bit flips across 40 DRAM devices from major vendors (Samsung, SK Hynix, Micron), enab...

PT-2021-17015 · Unknown · Amd System Management Unit

Name of the Vulnerable Software and Affected Versions: System Management Unit SMU affected versions not specified Description: The issue is related to improper access controls in the System Management Unit SMU, which may allow an attacker to override performance control tables located in DRAM. Th...

PT-2021-17014 · Amd · Athlon™ Series +87

Name of the Vulnerable Software and Affected Versions: No specific software or versions are mentioned. Description: The issue is related to insufficient DRAM address validation in the System Management Unit SMU, which may cause a DMA read from an invalid DRAM address to SRAM. This can result in t...

CVE-2021-42114

Modern DRAM devices PC-DDR4, LPDDR4X are affected by a vulnerability in their internal Target Row Refresh TRR mitigation against Rowhammer attacks. Novel non-uniform Rowhammer access patterns, consisting of aggressors with different frequencies, phases, and amplitudes allow triggering bit flips o...

CVE-2021-26337

Insufficient DRAM address validation in System Management Unit SMU may result in a DMA read from invalid DRAM address to SRAM resulting in SMU not servicing further requests...