Authentication with JWT allows use of “none”-algorithm
CVE-2021-22160

9.8CRITICAL

Key Information:

Vendor
Apache
Status
Apache Pulsar
Vendor
CVE Published:
26 May 2021

Summary

If Apache Pulsar is configured to authenticate clients using tokens based on JSON Web Tokens (JWT), the signature of the token is not validated if the algorithm of the presented token is set to "none". This allows an attacker to connect to Pulsar instances as any user (incl. admins).

Affected Version(s)

Apache Pulsar Apache Pulsar < 2.7.1

References

https://lists.apache.org/thread.html/r347650d15a3e9c5f58b...
x_refsource_MISC
https://lists.apache.org/thread.html/rf2e90942996dceebac8...
mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/ra49cb62105154e4795b...
mailing-listx_refsource_MLIST

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.