This vulnerability allows unauthenticated arbitrary code execution on Confluence Server & Data Center. It does this by taking advantage of how OGNL, an Expression Language for Java objects, evaluates user-supplied data.
In Confluence Server and Data Center, from 1.3.0 before 7.4.17 and affecting other LTS releases up to 7.18.1, an OGNL vulnerability exists that allows an unauthenticated user to remotely execute code on the server. The exploit requires sending an HTTP GET request to the Confluence Server using a specially crafted URL containing the template engine exploit. When Confluence handles this GET request the template engine executes the template code and no further user interaction is required.
Execute Operator’s CVE-2022-26134 TTP on each Confluence Server instance in your environment to test if you are vulnerable.
The TTP is configured to send a GET request to localhost using the default Confluence Server port 8090. Depending on your Confluence configuration, and whether this TTP is being run on the server or remotely, it may be necessary to adjust the URL in the TTP file. When the exploit is successful the GET response will contain a special `X-Prelude-Response: CVE-2022-26134` header.
Vulnerability scanners typically test this CVE by relying on remote exploitation of the Confluence Server via the specially crafted request. For example, if a server is running a Confluence instance, it will craft a specific HTTP GET request with the malicious code to see if it executes. This will expose whether the Confluence instance can be exploited.
Upgrade Confluence Server & Data Center to the latest version. Atlassian has published a security advisory with instructions for patching and a temporary mitigation if patching is not an option.
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