CVE-2021-26077

10.05.2021, 00:15

Broken Authentication in Atlassian Connect Spring Boot (ACSB) in version 1.1.0 before 2.1.3 and from version 2.1.4 before 2.1.5: 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 1.1.0 before 2.1.3 and versions 2.1.4 before 2.1.5 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.

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	NIST	8.8 HIGH	NETWORK	LOW	LOW	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
atlassian	CNA	---				---
CVE	ADP	---				---
CISA-ADP	ADP	9.1 CRITICAL	NETWORK	LOW	LOW	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L

Base Score

CVSS 3.x

EPSS Score

Percentile: 60%

Vendor	Product	Version
atlassian	connect_spring_boot	1.1.0 ≤ 𝑥 < 2.1.3
atlassian	connect_spring_boot	2.1.4 ≤ 𝑥 < 2.1.5

𝑥

= Vulnerable software versions

Known Exploits!

Common Weakness Enumeration

CWE-287 - Improper Authentication
When an actor claims to have a given identity, the software does not prove or insufficiently proves that the claim is correct.

References

https://community.developer.atlassian.com/t/action-required-atlassian-connect-vulnerability-allows-bypass-of-app-qsh-verification-via-context-jwts/47072

https://confluence.atlassian.com/pages/viewpage.action?pageId=1063555147

https://community.developer.atlassian.com/t/action-required-atlassian-connect-vulnerability-allows-bypass-of-app-qsh-verification-via-context-jwts/47072

https://confluence.atlassian.com/pages/viewpage.action?pageId=1063555147