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  • CVE-2020-26074 - Broken authentication in Atlassian Connect Spring Boot (ACSB)
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Description

Atlassian Connect Spring Boot is a Java Spring Boot package for building Atlassian Connect apps. Authentication between Atlassian products and the Atlassian Connect Spring Boot app occurs with a server-to-server JWT or a context JWT. Atlassian Connect Spring Boot versions between 1.1.0 - 2.1.2 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. This is fixed in version 2.1.3.

Affected versions

  • 1.1.0 - 2.1.2

Fixed versions

  • 2.1.3 and later

Severity

This is an independent assessment and you should evaluate its applicability to your own IT environment.

CVSS v3 score: 9.1 => Critical severity

Exploitability Metrics

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone


Scope Metric

ScopeChanged


Impact Metrics

ConfidentialityHigh
IntegrityLow
AvailabilityLow

https://asecurityteam.bitbucket.io/cvss_v3/#CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L


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