CVE-2017-11424

Severity Score

7.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

In PyJWT 1.5.0 and below the `invalid_strings` check in `HMACAlgorithm.prepare_key` does not account for all PEM encoded public keys. Specifically, the PKCS1 PEM encoded format would be allowed because it is prefaced with the string `-----BEGIN RSA PUBLIC KEY-----` which is not accounted for. This enables symmetric/asymmetric key confusion attacks against users using the PKCS1 PEM encoded public keys, which would allow an attacker to craft JWTs from scratch.

En PyJWT 1.5.0 y anteriores, la comprobación `invalid_strings` en `HMACAlgorithm.prepare_key` no da cuenta de todas las claves públicas codificadas PEM. Específicamente, el formato codificado PKCS1 PEM se permitiría porque va precedido por la cadena `-----BEGIN RSA PUBLIC KEY-----`, la cual no se tiene en cuenta. Esto permite ataques simétricos/asimétricos de confusión de claves contra usuarios que empleen las claves públicas PKCS1 PEM, que permitirían que un atacante manipulase JWT desde cero.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2017-07-18 CVE Reserved
2017-08-24 CVE Published
2023-11-28 EPSS Updated
2024-08-05 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (2)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC
https://github.com/jpadilla/pyjwt/pull/277	2019-10-03

URL	Date	SRC
http://www.debian.org/security/2017/dsa-3979	2019-10-03

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Pyjwt Project Search vendor "Pyjwt Project"		Pyjwt Search vendor "Pyjwt Project" for product "Pyjwt"				<= 1.5.0 Search vendor "Pyjwt Project" for product "Pyjwt" and version " <= 1.5.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				8.0 Search vendor "Debian" for product "Debian Linux" and version "8.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected