FortiGuard Labs is aware that an unauthenticated remote code execution vulnerability in Confluence (CVE-2022-26134) continues to be exploited to deploy malware in the field. Deployed malware reportedly includes Cerber2021 ransomware, Hezb, coinminers and Dark.IoT. The vulnerability was patched on June 3rd, 2022. Why is this Significant?This is significant because CVE-2022-26134 is a newly patched Confluence vulnerability that continues to be exploited in the field and various malware were deployed to the affected systems upon successful exploitation.What is CVE-2022-26134?CVE-2022-26134 is a critical vulnerability affects Confluence Server and Data Center which the latest patch has not yet been applied. The vulnerability relates to an Object-Graph Navigation Language (OGNL) injection that could allow an unauthenticated user to execute arbitrary code on the compromised system.Atlassian released a fix on June 3rd, 2022.FortiGuard Labs previously published a Threat Signal on the subject. See the Appendix for a link to “New Confluence Vulnerability (CVE-2022-26134) Exploited in the Wild”.What Malware were Deployed to the Compromised Servers?Malware such as Cerber2021 ransomware, Dark.IoT and coinminers such as Kinsing and XMRig miner are known to be deployed to the affected servers.What is the Status of Coverage?FortiGuard Labs detects the malicious samples that were known to be deployed through CVE-2022-21634 with the following AV signatures:W32/Filecoder.1104!tr.ransomELF/BitCoinMiner.HF!trELF/Mirai.A!trLinux/Agent.PZ!trLinux/CVE_2021_4034.G!trRiskware/CoinMinerAdware/MinerFortiGuard Labs released the following IPS signature against CVE-2022-26134 in version 21.331:Atlassian.Confluence.OGNL.Remote.Code.ExecutionInitially, the signature’s default action was set to “pass”, however the action was changed to “drop” from version 21.333.

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