CVE-2022-24884

high

Description

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.

References

https://github.com/freifunk-gluon/ecdsautils/commit/1d4b091abdf15ad7b2312535b5b95ad70f6dbd08

https://github.com/freifunk-gluon/ecdsautils/security/advisories/GHSA-qhcg-9ffp-78pw

https://github.com/freifunk-gluon/ecdsautils/commit/39b6d0a77414fd41614953a0e185c4eefa2f88ad

https://lists.debian.org/debian-lts-announce/2022/05/msg00007.html

https://www.debian.org/security/2022/dsa-5132

https://lists.fedoraproject.org/archives/list/[email protected]/message/G2JT57AAFIEL7JDO2ZBV25JKYME5NU54/

https://lists.fedoraproject.org/archives/list/[email protected]/message/4AKQH5WCBMJA3ODCSNERY6HVX4BX3ITG/

https://lists.fedoraproject.org/archives/list/[email protected]/message/L7UBR3M4U3LA46BHXYSH7EN5GDG44GK7/

Details

Source: MITRE

Published: 2022-05-06

Updated: 2022-05-16

Type: CWE-347

Risk Information

CVSS v2

Base Score: 5

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

Impact Score: 2.9

Exploitability Score: 10

Severity: MEDIUM

CVSS v3

Base Score: 7.5

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

Impact Score: 3.6

Exploitability Score: 3.9

Severity: HIGH