CVE-2019-14853

python-ecdsa: Unexpected and undocumented exceptions during signature decoding

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

An error-handling flaw was found in python-ecdsa before version 0.13.3. During signature decoding, malformed DER signatures could raise unexpected exceptions (or no exceptions at all), which could lead to a denial of service.

Se encontró un error de manejo de errores en python-ecdsa anterior de la versión 0.13.3. Durante la decodificación de firmas, las firmas DER mal formadas pueden generar excepciones inesperadas (o ninguna excepción), lo que podría conducir a una denegación de servicio.

An error-handling flaw was found in python-ecdsa. During signature decoding, malformed DER signatures could raise unexpected exceptions (or no exceptions at all), which could lead to a denial of service.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2019-08-10 CVE Reserved
2019-11-18 CVE Published
2024-08-05 CVE Updated
2024-11-19 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-391: Unchecked Error Condition
CWE-755: Improper Handling of Exceptional Conditions

CAPEC

References (6)

URL	Tag	Source
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14853	Issue Tracking
https://github.com/warner/python-ecdsa/releases/tag/python-ecdsa-0.13.3	Release Notes
https://seclists.org/bugtraq/2019/Dec/33	Mailing List

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://www.debian.org/security/2019/dsa-4588	2019-12-17
https://access.redhat.com/security/cve/CVE-2019-14853	2021-11-16
https://bugzilla.redhat.com/show_bug.cgi?id=1758704	2021-11-16

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Python-ecdsa Project Search vendor "Python-ecdsa Project"		Python-ecdsa Search vendor "Python-ecdsa Project" for product "Python-ecdsa"				< 0.13.3 Search vendor "Python-ecdsa Project" for product "Python-ecdsa" and version " < 0.13.3"		-		Affected