CVE-2022-24884

 

Published at: - 06-05-2022 02:15

Last modified: - 16-05-2022 08:08

Total changes: - 5

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.

Common Vulnerability Scoring System (CVSS)

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

 

Verification logic

 

Reference

• 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
• [debian-lts-announce] 20220507 [SECURITY] [DLA 2997-1] ecdsautils security update-Mailing List, Third Party Advisory
• DSA-5132-Third Party Advisory
• FEDORA-2022-111177a5ac-Mailing List, Third Party Advisory
• FEDORA-2022-bf58612696-Mailing List, Third Party Advisory
• FEDORA-2022-7704d5e885-Mailing List, Third Party Advisory

 

Keywords

NVD

 

CVE-2022-24884

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures