CVE-2021-26073

Description

Broken Authentication in Atlassian Connect Express (ACE) from version 3.0.2 before version 6.6.0: Atlassian Connect Express is a Node.js package for building Atlassian Connect apps. Authentication between Atlassian products and the Atlassian Connect Express app occurs with a server-to-server JWT or a context JWT. Atlassian Connect Express versions between 3.0.2 - 6.5.0 erroneously accept context JWTs in lifecycle endpoints (such as installation) where only server-to-server JWTs should be accepted, permitting an attacker to send authenticated re-installation events to an app.

Related CPE's

aatlassianconnect_express*****node.js**
vulnerable

References

N/A

Vendor Advisory

https://community.developer.atlassian.com/t/action-required-atlassian-connect-vulnerability-a[…]ypass-of-app-qsh-verification-via-context-jwts/47072

Issue TrackingVendor Advisory

CvssV3 impact

BaseSeverity

HIGH

ConfidentialityImpact

NONE

AttackComplexity

LOW

Scope

CHANGED

AttackVector

NETWORK

AvailabilityImpact

NONE

IntegrityImpact

HIGH

PrivilegesRequired

LOW

BaseScore

7.7

VectorString

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N

Version

3.1

UserInteraction

NONE

CvssV2 impact

AccessComplexity

LOW

ConfidentialityImpact

NONE

AvailabilityImpact

NONE

IntegrityImpact

PARTIAL

BaseScore

4

VectorString

AV:N/AC:L/Au:S/C:N/I:P/A:N

Version

2.0

AccessVector

NETWORK

Authentication

SINGLE