CVE-2022-24884

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.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
ecdsautils	23.04 lunar	Not affected
	22.10 kinetic	Ignored end of life, was needs-triage
	22.04 LTS jammy	Fixed 0.3.2+git20151018-2+deb10u1build0.22.04.1
	21.10 impish	Ignored end of life
	20.04 LTS focal	Fixed 0.3.2+git20151018-2+deb10u1build0.20.04.1
	18.04 LTS bionic	Fixed 0.3.2+git20151018-2ubuntu0.18.04.1~esm1 Ubuntu Pro
	16.04 LTS xenial	Fixed 0.3.2+git20151018-2ubuntu0.16.04.1~esm1 Ubuntu Pro

Get expanded security coverage with Ubuntu Pro

Reduce your average CVE exposure time from 98 days to 1 day with expanded CVE patching, ten-years security maintenance and optional support for the full stack of open-source applications. Free for personal use.

Get Ubuntu Pro

Severity score breakdown

Parameter	Value
Base score	7.5 · High
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

Related Ubuntu Security Notices (USN)

USN-6239-1
ECDSA Util vulnerability
20 July 2023