CVE-2017-11424

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Summary

CVECVE-2017-11424
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2017-08-24 16:29:00 UTC
Updated2019-10-03 00:03:00 UTC
DescriptionIn 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.

Risk And Classification

Problem Types: NVD-CWE-noinfo

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Debian Debian Linux 8.0 All All All
Operating System Debian Debian Linux 9.0 All All All
Operating System Debian Debian Linux 8.0 All All All
Operating System Debian Debian Linux 9.0 All All All
Application Pyjwt Project Pyjwt All All All All

References

ReferenceSourceLinkTags
Guard against PKCS1 PEM-encoded public keys by jpadilla · Pull Request #277 · jpadilla/pyjwt · GitHub CONFIRM github.com Issue Tracking, Patch, Third Party Advisory
Debian -- Security Information -- DSA-3979-1 pyjwt DEBIAN www.debian.org Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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