Input validation error in python-ecdsa - CVE-2019-14853

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Main Vulnerability Database Vulnerabilities #VU22619

Input validation error in python-ecdsa - CVE-2019-14853

Published: November 10, 2019


Vulnerability identifier: #VU22619
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-14853
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

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.


Affected software

python-ecdsa
Amazon Linux AMI
Fedora
Opensuse
python-ecdsa (Debian package)
py3-ecdsa (Alpine package)
python-ecdsa

How to mitigate CVE-2019-14853

Install updates from vendor's website.

python-ecdsa - update to 0.13.3
python-ecdsa (Debian package) - addressed in versions 0.13-2+deb9u1, 0.13-3+deb10u1
python-ecdsa - update to 0.11-3.4
python-ecdsa - addressed in versions 0.13.3-1.el7, 0.13.3-1.el8, 0.13.3-1.fc29, 0.13.3-1.fc30, 0.13.3-1.fc31

External References

Related Security Bulletins