Vulnerability identifier: #VU22619

Vulnerability risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-14853

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
python-ecdsa
Universal components / Libraries / Software for developers

Vendor: Brian Warner

Description

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.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

python-ecdsa: 0.5 - 0.13.2

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External links
http://github.com/advisories/GHSA-pwfw-mgfj-7g3g
http://github.com/warner/python-ecdsa/releases/tag/python-ecdsa-0.13.3

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.