SB2021090135 - Remote code execution in Atlassian Confluence Server

Description

This security bulletin contains information about 1 security vulnerability.

1) Code Injection (CVE-ID: CVE-2021-26084)

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.

Remediation

Install update from vendor's website.

References

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