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Bug 780483 (CVE-2021-20305) - <dev-libs/nettle-3.7.2: potential incorrect validation
Summary: <dev-libs/nettle-3.7.2: potential incorrect validation
Alias: CVE-2021-20305
Product: Gentoo Security
Classification: Unclassified
Component: Vulnerabilities (show other bugs)
Hardware: All Linux
: Normal minor (vote)
Assignee: Gentoo Security
Whiteboard: B4 [cleanup]
Depends on:
Reported: 2021-04-06 01:32 UTC by John Helmert III
Modified: 2021-04-06 01:32 UTC (History)
1 user (show)

See Also:
Package list:
Runtime testing required: ---


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Description John Helmert III gentoo-dev Security 2021-04-06 01:32:10 UTC

A flaw was found in Nettle in versions before 3.7.2, where several Nettle signature verification functions (GOST DSA, EDDSA & ECDSA) result in the Elliptic Curve Cryptography point (ECC) multiply function being called with out-of-range scalers, possibly resulting in incorrect results. This flaw allows an attacker to force an invalid signature, causing an assertion failure or possible validation. The highest threat to this vulnerability is to confidentiality, integrity, as well as system availability.

Please cleanup.