Fluid Attacks Database

Description

Improper Verification of Cryptographic Signature in Pure-Python ECDSA 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.

Mitigation

Update Impact

Minimal update. May introduce new vulnerabilities or breaking changes.

Ecosystem	Component	Affected version	Patched versions
debian 11	python-ecdsa	>=0 <0.13.3-1	0.13.3-1
debian 13	python-ecdsa	>=0 <0.13.3-1	0.13.3-1
debian 12	python-ecdsa	>=0 <0.13.3-1	0.13.3-1
pypi	ecdsa	>=0 <0.13.3	0.13.3
debian 14	python-ecdsa	>=0 <0.13.3-1	0.13.3-1

Aliases

1. CVE-2019-148592. NVD-2019-148593. OSV-DEBIAN-2019-148594. OSV-2019-148595. GHSA-8qxj-f9rh-9fg26. GCVE-2019-148597. SECURITY-TRACKER-CVE-2019-14859

References

1. https://github.com/warner/python-ecdsa/issues/1142. https://github.com/warner/python-ecdsa/pull/1153. https://github.com/tlsfuzzer/python-ecdsa/commit/3427fa29f319b27898a28601955807abb44c08304. https://github.com/tlsfuzzer/python-ecdsa/commit/9080d1d5ac533da0de00466aaffb49bee808bb4e5. https://github.com/tlsfuzzer/python-ecdsa/commit/b0ea52bb3aa9a16c9a4a91fdc0041edbfed10b316. https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-148597. https://github.com/pypa/advisory-database/tree/main/vulns/ecdsa/PYSEC-2020-163.yaml8. https://github.com/warner/python-ecdsa/releases/tag/python-ecdsa-0.13.39. https://pypi.org/project/ecdsa/0.13.3

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