CVE-2022-24884

Published: 6 May 2022

ecdsautils is a tiny collection of programs used for ECDSA (keygen, sign, verify). `ecdsa_verify_[prepare_]legacy()` does not check whether the signature values `r` and `s` are non-zero. A signature consisting only of zeroes is always considered valid, making it trivial to forge signatures. Requiring multiple signatures from different public keys does not mitigate the issue: `ecdsa_verify_list_legacy()` will accept an arbitrary number of such forged signatures. Both the `ecdsautil verify` CLI command and the libecdsautil library are affected. The issue has been fixed in ecdsautils 0.4.1. All older versions of ecdsautils (including versions before the split into a library and a CLI utility) are vulnerable.

Priority

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package	Release	Status
ecdsautils Launchpad, Ubuntu, Debian	bionic	Released (0.3.2+git20151018-2ubuntu0.18.04.1~esm1) Available with Ubuntu Pro
	focal	Released (0.3.2+git20151018-2+deb10u1build0.20.04.1)
	jammy	Released (0.3.2+git20151018-2+deb10u1build0.22.04.1)
	kinetic	Ignored (end of life, was needs-triage)
	upstream	Released (0.4.1-1)
	impish	Ignored (end of life)
	lunar	Not vulnerable (0.4.1-1)

Severity score breakdown

Parameter	Value
Base score	7.5
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	High
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References

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