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freebsdFreeBSDB70B880F-5727-11EA-A2F3-001CC0382B2F
HistoryOct 25, 2019 - 12:00 a.m.

Mbed TLS -- Side channel attack on ECDSA

2019-10-2500:00:00
vuxml.freebsd.org
11

4.7 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

1.9 Low

CVSS2

Access Vector

LOCAL

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:L/AC:M/Au:N/C:P/I:N/A:N

0.001 Low

EPSS

Percentile

18.5%

JSON

Janos Follath reports:

Our bignum implementation is not constant time/constant trace, so
side channel attacks can retrieve the blinded value, factor it (as
it is smaller than RSA keys and not guaranteed to have only large
prime factors), and then, by brute force, recover the key.

OSVersionArchitecturePackageVersionFilename
FreeBSDanynoarchmbedtls< 2.16.4UNKNOWN

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4.7 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

1.9 Low

CVSS2

Access Vector

LOCAL

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:L/AC:M/Au:N/C:P/I:N/A:N

0.001 Low

EPSS

Percentile

18.5%

JSON
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