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The requests were sent to /json/setup-restore.action?synchronous=true, as seen in the example below: - SYSTEMNAME 193.176.17941 POST /json/setup-restore.action?synchronous=true HTTP/1.3ms - Mozilla/5.0 (Windows NT 10.0 Win64 圆4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/.169 Safari/537.36 Rapid7 observed POST requests in HTTP access logs ( /atlassian/confluence/logs) on both Windows and Linux.

The process execution chain, for the most part, is consistent across multiple environments, indicating possible mass exploitation of vulnerable internet-facing Atlassian Confluence servers. The alerts we observed occurred between 10:08:34 and 23:05:35 UTC. Observed attacker behaviorīeginning November 5, 2023, Rapid7 MDR began responding to exploitation of Confluence Server within various customer environments. MDR has also observed attempts to exploit CVE-2023-22515, a critical broken access control vulnerability in Confluence that came to light on October 4.Ītlassian updated their advisory for CVE-2023-22518 on November 3 to note that exploitation of the vulnerability had been reported to them by a customer. Atlassian published an advisory for the vulnerability on October 31, 2023. We have confirmed that at least some of the exploits are targeting CVE-2023-22518, an improper authorization vulnerability affecting Confluence Data Center and Confluence Server. Daniel Lydon and Conor Quinn contributed attacker behavior insights to this blog.Īs of November 5, 2023, Rapid7 Managed Detection and Response (MDR) is observing exploitation of Atlassian Confluence in multiple customer environments, including for ransomware deployment.

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