Vulnerability CVE-2020-10255


Published: 2020-03-10

Description:
Modern DRAM chips (DDR4 and LPDDR4 after 2015) are affected by a vulnerability in deployment of internal mitigations against RowHammer attacks known as Target Row Refresh (TRR), aka the TRRespass issue. To exploit this vulnerability, the attacker needs to create certain access patterns to trigger bit flips on affected memory modules, aka a Many-sided RowHammer attack. This means that, even when chips advertised as RowHammer-free are used, attackers may still be able to conduct privilege-escalation attacks against the kernel, conduct privilege-escalation attacks against the Sudo binary, and achieve cross-tenant virtual-machine access by corrupting RSA keys. The issue affects chips produced by SK Hynix, Micron, and Samsung. NOTE: tracking DRAM supply-chain issues is not straightforward because a single product model from a single vendor may use DRAM chips from different manufacturers.

Type:

CWE-20

(Improper Input Validation)

CVSS2 => (AV:N/AC:M/Au:N/C:C/I:C/A:C)

CVSS Base Score
Impact Subscore
Exploitability Subscore
9.3/10
10/10
8.6/10
Exploit range
Attack complexity
Authentication
Remote
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
Complete
Complete
Complete
Affected software
Skhynix -> Ddr4 sdram 
Skhynix -> Lpddr4 
Samsung -> DDR4 
Samsung -> Lpddr4 
Micron -> Ddr4 sdram 
Micron -> Lpddr4 

 References:
https://download.vusec.net/papers/trrespass_sp20.pdf
https://github.com/vusec/trrespass
https://thehackernews.com/2020/03/rowhammer-vulnerability-ddr4-dram.html
https://twitter.com/antumbral/status/1237425959407513600
https://twitter.com/vu5ec/status/1237399112590467072
https://www.vusec.net/projects/trrespass/

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