7.5

CVE-2017-11424: debian debian_linux

CVSS: 7.5v3.0HighModified
AliasesGHSA-r9jw-mwhq-wp62PYSEC-2017-24UBUNTU-CVE-2017-11424
Published 24-08-2017Last modified 05-08-2024
Open JSON

Vulnerability summary

CVE-2017-11424 is a high (CVSS 7.5) vulnerability in debian debian_linux. EPSS estimates a 1.80% chance of exploitation in the next 30 days, higher than 78.2% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.0 (NVD)
EPSS score
1.80%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 0 · Duplicates 1
CVE-2017-12880

Timeline

  1. 24-08-2017
    PublishedVulnerability first disclosed.
  2. 05-08-2024
    Last modifiedVulnerability information updated.

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 metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

1.80%

Chance of exploitation in the next 30 days

Percentile

78%

Versus all other CVEs

30-day change

0.00 pp

From 1.80% on 19-09-2026

19-09-202619-10-2026
EPSS score
1.80%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Debian2 products
  • pyjwt< 1.4.2-1.1 | < 0.2.1-1+deb8u2 | < 1.4.2-1+deb9u1
  • debian_linuxEOL8.0 | 9.0
Pyjwt_project1 product
PyPI1 product
  • pyjwt< 1.5.1
Ubuntu1 product
  • pyjwt< 1.3.0-1ubuntu0.1

4 vendors · 5 products

References

10 links