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In the CC254x OAD solution:
The signature verification implementation uses a non-constant time memcmp function, which potentially enables the MAC check to be vulnerable to a timing attack.
CVSS base score: 8.1
CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
Potentially Impacted features
The following service-pack release addresses the potential vulnerability with a constant time memcmp function in aesSignature():
Customers of affected products should apply this service-pack and consider further system-level security measures as appropriate. Customers are solely responsible for the security of their products and are encouraged to assess the possible risk of any potential security vulnerability.
We would like to thank researchers from COSIC, KU Leuven and imec for reporting this vulnerability to the TI Product Security Incident Response Team (PSIRT) and working toward a coordinated report.
TI PROVIDES THIS INFORMATION, INCLUDING THE CVSS (COMMON VULNERABILITY SCORING SYSTEM) SCORE, “AS IS” and with all faults, and disclaims all warranties, express and implied, including without limitation any implied warranties of merchantability, fitness for a particular purpose or non-infringement of third party intellectual property rights. THE CVSS SCORE WAS CALCULATED WITH THE CVSS 3.0 CALCULATOR AND IS BASED ON TI AVAILABLE INFORMATION AND TI ESTIMATES.
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Cheers, Marie H.
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