CVE-2020-12607

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Source
https://nvd.nist.gov/vuln/detail/CVE-2020-12607
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2020-12607.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2020-12607
Aliases
Published
2020-06-02T21:15:10Z
Modified
2025-10-15T11:31:00.700617Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
Summary
[none]
Details

An issue was discovered in fastecdsa before 2.1.2. When using the NIST P-256 curve in the ECDSA implementation, the point at infinity is mishandled. This means that for an extreme value in k and s^-1, the signature verification fails even if the signature is correct. This behavior is not solely a usability problem. There are some threat models where an attacker can benefit by successfully guessing users for whom signature verification will fail.

References

Affected packages

Git / github.com/antonkueltz/fastecdsa

Affected ranges

Type
GIT
Repo
https://github.com/antonkueltz/fastecdsa
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
4a16daeaf139be20654ef58a9fe4c79dc030458c
Fixed
7b64e3efaa806b4daaf73bb5172af3581812f8de
Fixed
e592f106edd5acf6dacedfab2ad16fe6c735c9d1

Affected versions

v1.*

v1.0.1
v1.0.2
v1.0.3
v1.1.3
v1.2.1
v1.3.1
v1.3.2
v1.4.1
v1.4.2
v1.5.1
v1.5.2
v1.6.1
v1.6.2
v1.6.3
v1.6.4
v1.6.5
v1.7.1
v1.7.2
v1.7.3
v1.7.4
v1.7.5

v2.*

v2.0.0
v2.1.0
v2.1.1
v2.1.2

Database specific

vanir_signatures

[
    {
        "signature_type": "Function",
        "id": "CVE-2020-12607-66ce0194",
        "target": {
            "function": "pointZZ_pDouble",
            "file": "src/curveMath.c"
        },
        "signature_version": "v1",
        "deprecated": false,
        "source": "https://github.com/antonkueltz/fastecdsa/commit/e592f106edd5acf6dacedfab2ad16fe6c735c9d1",
        "digest": {
            "function_hash": "93520763919975657384232032081005663602",
            "length": 830.0
        }
    },
    {
        "signature_type": "Function",
        "id": "CVE-2020-12607-765a86e6",
        "target": {
            "function": "pointZZ_pMul",
            "file": "src/curveMath.c"
        },
        "signature_version": "v1",
        "deprecated": false,
        "source": "https://github.com/antonkueltz/fastecdsa/commit/e592f106edd5acf6dacedfab2ad16fe6c735c9d1",
        "digest": {
            "function_hash": "114807553560984464700912165694170755712",
            "length": 1007.0
        }
    },
    {
        "signature_type": "Function",
        "id": "CVE-2020-12607-9ebef2d1",
        "target": {
            "function": "pointZZ_pAdd",
            "file": "src/curveMath.c"
        },
        "signature_version": "v1",
        "deprecated": false,
        "source": "https://github.com/antonkueltz/fastecdsa/commit/e592f106edd5acf6dacedfab2ad16fe6c735c9d1",
        "digest": {
            "function_hash": "237713034721248222028732838030589999764",
            "length": 794.0
        }
    },
    {
        "signature_type": "Line",
        "id": "CVE-2020-12607-adb032bc",
        "target": {
            "file": "src/curveMath.c"
        },
        "signature_version": "v1",
        "deprecated": false,
        "source": "https://github.com/antonkueltz/fastecdsa/commit/e592f106edd5acf6dacedfab2ad16fe6c735c9d1",
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "295440111576572506065665976290646547187",
                "196854035119909962313773951870531590818",
                "317871309843992884374969037078204491522",
                "104375746076562032098332227659040301528",
                "65416599458374717787017732325794096570",
                "177423792026663125093054846541122329542",
                "218619352812740939546316886251052461695",
                "40930251885493100673819922373020214212",
                "243540426651314462511606196020035304659",
                "273798193599705150604646108665496793181",
                "170054887755278315323162088544007563571",
                "197353946011006447932649302589988372905",
                "234408837222518631626031317531483544714",
                "74221276442437195587473428445690813998"
            ]
        }
    }
]