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Vulnerability Details : CVE-2017-11424

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.
Publish Date : 2017-08-24 Last Update Date : 2019-10-02
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- CVSS Scores & Vulnerability Types

CVSS Score
5.0
Confidentiality Impact None (There is no impact to the confidentiality of the system.)
Integrity Impact Partial (Modification of some system files or information is possible, but the attacker does not have control over what can be modified, or the scope of what the attacker can affect is limited.)
Availability Impact None (There is no impact to the availability of the system.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s)
CWE ID CWE id is not defined for this vulnerability

- Products Affected By CVE-2017-11424

# Product Type Vendor Product Version Update Edition Language
1 OS Debian Debian Linux 8.0 Version Details Vulnerabilities
2 OS Debian Debian Linux 9.0 Version Details Vulnerabilities
3 Application Pyjwt Project Pyjwt 1.5.0 Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Debian Debian Linux 2
Pyjwt Project Pyjwt 1

- References For CVE-2017-11424

https://github.com/jpadilla/pyjwt/pull/277 CONFIRM
http://www.debian.org/security/2017/dsa-3979
DEBIAN DSA-3979

- Metasploit Modules Related To CVE-2017-11424

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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