pyjwt Insecure HMAC Signature Verification Security Weakness

Bugtraq ID:	75330
Class:	Design Error
CVE:
Remote:	Yes
Local:	No
Published:	Jun 20 2015 12:00AM
Updated:	Jun 20 2015 12:00AM
Credit:	Tim McLean
Vulnerable:	pyjwt pyjwt 0.2.1-1 Debian Linux 6.0 sparc Debian Linux 6.0 s/390 Debian Linux 6.0 powerpc Debian Linux 6.0 mips Debian Linux 6.0 ia-64 Debian Linux 6.0 ia-32 Debian Linux 6.0 arm Debian Linux 6.0 amd64
Not Vulnerable:

pyjwt Insecure HMAC Signature Verification Security Weakness

pyjwt is prone to a security weakness.

An attacker can exploit this issue to perform certain unauthorized actions or gain potentially sensitive information.

pyjwt Insecure HMAC Signature Verification Security Weakness

Currently, we are not aware of any working exploits. If you feel we are in error or if you are aware of more recent information, please mail us at: [email protected].

pyjwt Insecure HMAC Signature Verification Security Weakness

Solution:
Updates are available. Please see the references or vendor advisory for more information.

pyjwt Insecure HMAC Signature Verification Security Weakness

References:

• pyjwt GitHub Page (GitHub)
  
• [PATCH 1/6] Added a check so that asymmetric keys cannot be used as HMAC secre (GitHub)
  
• Asymmetric keys and x509 certificates should not be used as HMAC keys (Debian)