Trio of major ownCloud vulnerabilities sparks ACSC critical alert

A critical alert has been issued by the Australian Cyber Security Centre (ACSC) after it discovered a trio of major vulnerabilities with the ownCloud file-sharing platform.

The three vulnerabilities – CVE-2023-49103, CVE-2023-49104 and CVE-2023-49105 – all have the potential to grant a threat actor unauthorised access to a user’s systems.

“CVE-2023-49103 is a max-rated critical vulnerability [that] exposes sensitive information, potentially including admin passwords and security keys, which could allow full authenticated access to a system.
“CVE-2023-49104 is a critical-rated vulnerability [that] allows an attacker to bypass domain validation, which can be used to create a connection back to a server they control.
“CVE-2023-49105 is a critical-rated vulnerability [that] allows an unauthenticated attacker to access, modify or delete any file if a valid username is known, and no signing key is configured (which is the default).”

The vulnerabilities were first discovered when ownCloud published warnings for the three vulnerabilities, saying that all three could be used to breach customer systems.

CVE-2023-49103 is considered the most severe of the three, with a maximum CVSS severity score of 10, due to the way in which a threat actor could view credentials by executing phpinfo() within the services “graphapi” app, allowing them to see the server environment variables.

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“The ‘graphapi’ app relies on a third-party library that provides a URL. When this URL is accessed, it reveals the configuration details of the PHP environment (phpinfo),” wrote ownCloud.

“This information includes all the environment variables of the web server. In containerised deployments, these environment variables may include sensitive data such as the ownCloud admin password, mail server credentials, and license key.”

While ownCloud has said that deleting the graphapi app won’t solve the issue, it has said that it disabled the phpinfo function within its Docker containers. It has also advised its customers to change credentials such as admin passwords, server details, database credentials and “Object-Store/S3 access-key”.

It has also said that customers should delete the “owncloud/apps/graphapi/vendor/microsoft/microsoft-graph/tests/GetPhpInfo.php” file.

The ACSC has added that it has observed cases of CVE-2023-49103 being exploited in the wild. According to Shadowserver, there had been 11,000 instances of exploitation recorded.

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Daniel Croft

Born in the heart of Western Sydney, Daniel Croft is a passionate journalist with an understanding for and experience writing in the technology space. Having studied at Macquarie University, he joined Momentum Media in 2022, writing across a number of publications including Australian Aviation, Cyber Security Connect and Defence Connect. Outside of writing, Daniel has a keen interest in music, and spends his time playing in bands around Sydney.

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Trio of major ownCloud vulnerabilities sparks ACSC critical alert

Daniel Croft

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