SB2019111005 - Multiple vulnerabilities in Pure-Python ECDSA Python package

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Input validation error (CVE-ID: CVE-2019-14853)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input when decoding digital signatures. A remote attacker can send specially crafted data to the application that uses Pure-Python ECDSA module and perform a denial of service attack.

2) Input validation error (CVE-ID: CVE-2019-14859)

The vulnerability allows a remote attacker to bypass certain security restrictions.

The vulnerability exists due to signature malleability while processing DER-encoded data. A remote attacker can bypass certain security restrictions.

Remediation

Install update from vendor's website.

References

• https://github.com/advisories/GHSA-pwfw-mgfj-7g3g
• https://github.com/warner/python-ecdsa/releases/tag/python-ecdsa-0.13.3