CVE-2017-11424 — Project Pyjwt vulnerability

11 documents8 sources
Severity
7.5HIGHNVD
EPSS
0.8%
top 25.13%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
Pyjwt Project PyjwtDebian PyjwtDebian Linux
Timeline
PublishedAug 24
Latest updateMay 13

Description

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.

CVSS vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:NExploitability: 3.9 | Impact: 3.6

Affected Packages4 packages

▶debiandebian/pyjwt< pyjwt 1.4.2-1.1 (bookworm)
▶PyPIpyjwt_project/pyjwt< 1.5.1
▶Debianpyjwt_project/pyjwt< 1.4.2-1.1+3

Also affects: Debian Linux 8.0, 9.0

Patches

Patch: github.com ↗Patch: github.com ↗

🔴Vulnerability Details

3
GHSA
PyJWT vulnerable to key confusion attacks↗2022-05-13
▶
OSV
PyJWT vulnerable to key confusion attacks↗2022-05-13
▶
OSV
CVE-2017-11424: In PyJWT 1↗2017-08-24
▶

📋Vendor Advisories

3
Ubuntu
PyJWT vulnerability↗2017-08-30
▶
Red Hat
python-jwt: Incorrect handling of PEM-encoded public keys↗2017-06-22
▶
Debian
CVE-2017-11424: pyjwt - In PyJWT 1.5.0 and below the `invalid_strings` check in `HMACAlgorithm.prepare_k...↗2017
▶

📄Research Papers

1
CTF
cr0wnair / writeup_cr0wnair↗2021
▶

💬Community

3
Bugzilla
CVE-2017-11424 python-jwt: Incorrect handling of PEM-encoded public keys [epel-7]↗2017-08-17
▶
Bugzilla
CVE-2017-11424 python-jwt: Incorrect handling of PEM-encoded public keys↗2017-08-17
▶
Bugzilla
CVE-2017-11424 python-jwt: Incorrect handling of PEM-encoded public keys [fedora-all]↗2017-08-17
▶