ownCloud Vulnerability With Maximum 10 Severity Score Comes Under 'Mass' Exploitation
An anonymous reader quotes a report from Ars Technica: Security researchers are tracking what they say is the "mass exploitation" of a security vulnerability that makes it possible to take full control of servers running ownCloud, a widely used open source file-sharing server app. The vulnerability, which carries the maximum severity rating of 10, makes it possible to obtain passwords and cryptographic keys allowing administrative control of a vulnerable server by sending a simple Web request to a static URL, ownCloud officials warned last week. Within four days of the November 21 disclosure, researchers at security firm Greynoise said, they began observing "mass exploitation" in their honeypot servers, which masqueraded as vulnerable ownCloud servers to track attempts to exploit the vulnerability. The number of IP addresses sending the web requests has slowly risen since then. At the time this post went live on Ars, it had reached 13. CVE-2023-49103 resides in versions 0.2.0 and 0.3.0 of graphapi, an app that runs in some ownCloud deployments, depending on the way they're configured. A third-party code library used by the app provides a URL that, when accessed, reveals configuration details from the PHP-based environment. In last week's disclosure, ownCloud officials said that in containerized configurations -- such as those using the Docker virtualization tool -- the URL can reveal data used to log in to the vulnerable server. The officials went on to warn that simply disabling the app in such cases wasn't sufficient to lock down a vulnerable server. [...] To fix the ownCloud vulnerability under exploitation, ownCloud advised users to: "Delete the file owncloud/apps/graphapi/vendor/microsoft/microsoft-graph/tests/GetPhpInfo.php. Additionally, we disabled the phpinfo function in our docker-containers. We will apply various hardenings in future core releases to mitigate similar vulnerabilities. We also advise to change the following secrets:- ownCloud admin password- Mail server credentials- Database credentials- Object-Store/S3 access-key"
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