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FreeBSD: VID-80F9DBD3-8EEC-11EB-B9E8-3525F51429A0: nettle 3.7.2 -- fix serious ECDSA signature verify bug

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FreeBSD: VID-80F9DBD3-8EEC-11EB-B9E8-3525F51429A0: nettle 3.7.2 -- fix serious ECDSA signature verify bug

Severity
4
CVSS
(AV:L/AC:M/Au:N/C:P/I:P/A:P)
Published
03/21/2021
Created
03/30/2021
Added
03/28/2021
Modified
03/29/2021

Description

Niels Möller reports:

I've prepared a new bug-fix release of Nettle, a low-level

cryptographics library, to fix a serious bug in the function to

verify ECDSA signatures. Implications include an assertion failure,

which could be used for denial-of-service, when verifying signatures

on the secp_224r1 and secp521_r1 curves.

Even when no assert is triggered in ecdsa_verify, ECC point

multiplication may get invalid intermediate values as input, and

produce incorrect results. [...] It appears difficult to construct

an alleged signature that makes the function misbehave in such a way

that an invalid signature is accepted as valid, but such attacks

can't be ruled out without further analysis.

Solution(s)

  • freebsd-upgrade-package-linux-c7-nettle
  • freebsd-upgrade-package-nettle

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