CVE-2021-43572 Improper Verification of Cryptographic Signature in starkbank-ecdsa
Attackers can forge signatures on arbitrary messages due to missing non-zero checks in the Stark Bank Python ECDSA library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-43572?
CVE-2021-43572 is a critical vulnerability in n/a, published on 9 Nov 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-347
Which versions are affected by CVE-2021-43572?
3 open source packages ship an affected version, including starkbank-ecdsa. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
starkbank-ecdsa PyPI | All versions | 2.0.1 |
starkbank-ecdsa PyPI | All versions | 2.0.1 |
starkbank-ecdsa PyPI | All versions | 2.0.1 |
Products include Starkbank Ecdsa-Python.
How do I fix CVE-2021-43572?
Upgrade starkbank-ecdsa to 2.0.1 or later.
Is CVE-2021-43572 being exploited?
There is no known exploitation of CVE-2021-43572 in the wild and no public exploit code.
Sources
Also known as GHSA-92vm-mxjf-jqf3, PYSEC-2021-426.