Vulnerability Details CVE-2021-43572
The verify function in the Stark Bank Python ECDSA library (aka starkbank-escada or ecdsa-python) before 2.0.1 fails to check that the signature is non-zero, which allows attackers to forge signatures on arbitrary messages.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 47.3%
CVSS Severity
CVSS v3 Score 9.8
CVSS v2 Score 7.5
References
- https://github.com/starkbank/ecdsa-python/commit/d136170666e9510eb63c2572551805807bd4c17f
- https://github.com/starkbank/ecdsa-python/releases/tag/v2.0.1
- https://research.nccgroup.com/2021/11/08/technical-advisory-arbitrary-signature-forgery-in-stark-bank-ecdsa-libraries/
- https://github.com/starkbank/ecdsa-python/commit/d136170666e9510eb63c2572551805807bd4c17f
- https://github.com/starkbank/ecdsa-python/releases/tag/v2.0.1
- https://research.nccgroup.com/2021/11/08/technical-advisory-arbitrary-signature-forgery-in-stark-bank-ecdsa-libraries/
Products affected by CVE-2021-43572
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cpe:2.3:a:starkbank:ecdsa-python:0.1
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cpe:2.3:a:starkbank:ecdsa-python:0.1.0
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cpe:2.3:a:starkbank:ecdsa-python:0.1.1
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cpe:2.3:a:starkbank:ecdsa-python:0.1.2
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cpe:2.3:a:starkbank:ecdsa-python:0.1.3
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cpe:2.3:a:starkbank:ecdsa-python:0.1.4
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cpe:2.3:a:starkbank:ecdsa-python:0.1.7
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cpe:2.3:a:starkbank:ecdsa-python:0.1.8
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cpe:2.3:a:starkbank:ecdsa-python:0.1.9
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cpe:2.3:a:starkbank:ecdsa-python:1.0.0
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cpe:2.3:a:starkbank:ecdsa-python:1.1.0
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cpe:2.3:a:starkbank:ecdsa-python:1.1.1
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cpe:2.3:a:starkbank:ecdsa-python:2.0.0