Remote code execution in Atlassian Confluence Server



Published: 2021-09-01 | Updated: 2023-03-17
Risk High
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-26084
CWE-ID CWE-94
Exploitation vector Network
Public exploit Vulnerability #1 is being exploited in the wild.
Vulnerable software
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Atlassian Confluence Server
Server applications / Web servers

Vendor Atlassian

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) Code Injection

EUVDB-ID: #VU56249

Risk: High

CVSSv3.1: 8.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2021-26084

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

Exploit availability: Yes

Description

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

The vulnerability exists due to improper input validation. A remote attacker can send a specially crafted request, perform the OGNL injection and execute arbitrary code on the system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system but requires that the "Allow people to sign up to create their account" option is enabled.

Note, as of September 3 the vulnerability is being actively exploited in the wild.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Atlassian Confluence Server: 6.0.1 - 7.12.4

External links

http://jira.atlassian.com/browse/CONFSERVER-67940
http://packetstormsecurity.com/files/164013/Confluence-Server-7.12.4-OGNL-Injection-Remote-Code-Execution.html


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker 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. However, proof of concept for this vulnerability is available.



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