Code injection in Atlassian Confluence Server



Published: 2020-07-01 | Updated: 2021-03-16
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-4027
CWE-ID CWE-94
Exploitation vector Network
Public exploit N/A
Vulnerable software
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Atlassian Confluence Server
Server applications / Web servers

Vendor Atlassian

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Code Injection

EUVDB-ID: #VU51512

Risk: Low

CVSSv3.1: 3.3 [CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-4027

CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')

Exploit availability: No

Description

The vulnerability allows a remote user to execute arbitrary code on the target system.

The vulnerability exists due to improper input validation. A remote user can bypass velocity template injection mitigations via an injection vulnerability in custom user macros and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Atlassian Confluence Server: 7.4.0 - 7.5.0

External links

http://jira.atlassian.com/browse/CONFSERVER-59898


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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