GHSA-8qxj-f9rh-9fg2
Vulnerability from github
Published
2020-04-01 16:35
Modified
2024-09-20 16:52
Severity ?
9.1 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
9.3 (Critical) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
9.3 (Critical) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Summary
Improper Verification of Cryptographic Signature in Pure-Python ECDSA
Details
A flaw was found in all python-ecdsa versions before 0.13.3, where it did not correctly verify whether signatures used DER encoding. Without this verification, a malformed signature could be accepted, making the signature malleable. Without proper verification, an attacker could use a malleable signature to create false transactions.
{ "affected": [ { "ecosystem_specific": { "affected_functions": [ "ecdsa.der.remove_constructed", "ecdsa.der.remove_sequence", "ecdsa.der.remove_octet_string", "ecdsa.der.remove_object", "ecdsa.der.remove_integer", "ecdsa.der.read_length", "ecdsa.keys.VerifyingKey.verify_digest", "ecdsa.util.sigdecode_string", "ecdsa.util.sigdecode_strings" ] }, "package": { "ecosystem": "PyPI", "name": "ecdsa" }, "ranges": [ { "events": [ { "introduced": "0" }, { "fixed": "0.13.3" } ], "type": "ECOSYSTEM" } ] } ], "aliases": [ "CVE-2019-14859" ], "database_specific": { "cwe_ids": [ "CWE-347" ], "github_reviewed": true, "github_reviewed_at": "2020-04-01T15:40:54Z", "nvd_published_at": "2020-01-02T15:15:00Z", "severity": "CRITICAL" }, "details": "A flaw was found in all python-ecdsa versions before 0.13.3, where it did not correctly verify whether signatures used DER encoding. Without this verification, a malformed signature could be accepted, making the signature malleable. Without proper verification, an attacker could use a malleable signature to create false transactions.", "id": "GHSA-8qxj-f9rh-9fg2", "modified": "2024-09-20T16:52:23Z", "published": "2020-04-01T16:35:26Z", "references": [ { "type": "ADVISORY", "url": "https://nvd.nist.gov/vuln/detail/CVE-2019-14859" }, { "type": "WEB", "url": "https://github.com/warner/python-ecdsa/issues/114" }, { "type": "WEB", "url": "https://github.com/warner/python-ecdsa/pull/115" }, { "type": "WEB", "url": "https://github.com/tlsfuzzer/python-ecdsa/commit/3427fa29f319b27898a28601955807abb44c0830" }, { "type": "WEB", "url": "https://github.com/tlsfuzzer/python-ecdsa/commit/9080d1d5ac533da0de00466aaffb49bee808bb4e" }, { "type": "WEB", "url": "https://github.com/tlsfuzzer/python-ecdsa/commit/b0ea52bb3aa9a16c9a4a91fdc0041edbfed10b31" }, { "type": "WEB", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14859" }, { "type": "ADVISORY", "url": "https://github.com/advisories/GHSA-8qxj-f9rh-9fg2" }, { "type": "WEB", "url": "https://github.com/pypa/advisory-database/tree/main/vulns/ecdsa/PYSEC-2020-163.yaml" }, { "type": "PACKAGE", "url": "https://github.com/warner/python-ecdsa" }, { "type": "WEB", "url": "https://github.com/warner/python-ecdsa/releases/tag/python-ecdsa-0.13.3" }, { "type": "WEB", "url": "https://pypi.org/project/ecdsa/0.13.3" } ], "schema_version": "1.4.0", "severity": [ { "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "type": "CVSS_V3" }, { "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N", "type": "CVSS_V4" } ], "summary": "Improper Verification of Cryptographic Signature in Pure-Python ECDSA" }
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- Confirmed: The vulnerability is confirmed from an analyst perspective.
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- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.