CVE-2022-24884: Trivial signature forgery in ecdsautils
First published: Thu May 05 2022(Updated: )
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.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/ecdsautils | 0.3.2+git20151018-2+deb10u1 0.3.2+git20151018-2+deb11u1 0.4.1-3 | |
| ubuntu/ecdsautils | <0.3.2+ | 0.3.2+ |
| ubuntu/ecdsautils | <0.3.2+ | 0.3.2+ |
| ubuntu/ecdsautils | <0.3.2+ | 0.3.2+ |
| ubuntu/ecdsautils | <0.4.1-1 | 0.4.1-1 |
| ecdsautils | <0.4.1 | |
| Fedora | =34 | |
| Fedora | =35 | |
| Fedora | =36 | |
| Debian | =9.0 | |
| Debian | =10.0 | |
| Debian | =11.0 |
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Reference Links
- https://github.com/freifunk-gluon/ecdsautils/security/advisories/GHSA-qhcg-9ffp-78pw
- https://github.com/freifunk-gluon/ecdsautils/commit/1d4b091abdf15ad7b2312535b5b95ad70f6dbd08
- 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/package-announce@lists.fedoraproject.org/message/G2JT57AAFIEL7JDO2ZBV25JKYME5NU54/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/L7UBR3M4U3LA46BHXYSH7EN5GDG44GK7/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4AKQH5WCBMJA3ODCSNERY6HVX4BX3ITG/
- https://launchpad.net/bugs/cve/CVE-2022-24884
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4AKQH5WCBMJA3ODCSNERY6HVX4BX3ITG/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G2JT57AAFIEL7JDO2ZBV25JKYME5NU54/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L7UBR3M4U3LA46BHXYSH7EN5GDG44GK7/
- https://security-tracker.debian.org/tracker/CVE-2022-24884
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-24884
- https://github.com/freifunk-gluon/ecdsautils/commit/1d4b091abdf15ad7b2312535b5b95ad70f6dbd08 (v0.4.1)
- https://ubuntu.com/security/notices/USN-6239-1
- https://nvd.nist.gov/vuln/detail/CVE-2022-24884
- https://ubuntu.com/security/CVE-2022-24884
Frequently Asked Questions
What is the severity of CVE-2022-24884?
CVE-2022-24884 has a high severity due to its potential for signature forgery.
How do I fix CVE-2022-24884?
To fix CVE-2022-24884, upgrade ecdsautils to versions 0.3.2+git20151018-2+deb10u1, 0.3.2+git20151018-2+deb11u1, or 0.4.1-3 or later.
What versions of ecdsautils are affected by CVE-2022-24884?
Affected versions of ecdsautils include 0.3.2 and any versions prior to 0.4.1.
Can I exploit CVE-2022-24884 without authentication?
Yes, CVE-2022-24884 can be exploited without authentication, making it particularly dangerous.
What platforms are impacted by CVE-2022-24884?
CVE-2022-24884 impacts Debian, Ubuntu, and Fedora distributions that use vulnerable versions of ecdsautils.
- agent/type
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- collector/launchpad-cve
- source/Launchpad
- collector/security-tracker-debian
- source/Debian
- agent/software-canonical-lookup
- collector/usn-cve
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- agent/references
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- agent/description
- collector/mitre-cve
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- agent/softwarecombine
- agent/tags
- collector/nvd-index
- agent/software-canonical-lookup-request
- collector/nvd-cve
- source/NVD
- package-manager/debian
- package-manager/ubuntu
- vendor/ecdsautils project
- canonical/ecdsautils
- vendor/fedoraproject
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- version/fedora/34
- version/fedora/35
- version/fedora/36
- vendor/debian
- canonical/debian
- version/debian/9.0
- version/debian/10.0
- version/debian/11.0