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CVE-2016-4028

7.5 · HIGH

An issue was discovered in Open-Xchange OX Guard before 2.4.0-rev8.

Published Dec 15, 2016CWE-255EPSS 0.71%

Overview

CVE-2016-4028 is a high-severity vulnerability. It was published on December 15, 2016 and has a CVSS 3.0 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.0 base score of 7.5, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

An issue was discovered in Open-Xchange OX Guard before 2.4.0-rev8. OX Guard uses an authentication token to identify and transfer guest users' credentials. The OX Guard API acts as a padding oracle by responding with different error codes depending on whether the provided token matches the encryption padding. In combination with AES-CBC, this allows attackers to guess the correct padding. Attackers may run brute-forcing attacks on the content of the guest authentication token and discover user credentials. For a practical attack vector, the guest users needs to have logged in, the content of the guest user's "OxReaderID" cookie and the value of the "auth" parameter needs to be known to the attacker.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refwww.securityfocus.com/archive/1/538732/100/0/threadedRefwww.securitytracker.com/id/1036154Refwww.securityfocus.com/archive/1/538732/100/0/threadedRefwww.securitytracker.com/id/1036154

How CyberStrike helps

Frequently asked questions

What is CVE-2016-4028?

CVE-2016-4028 is a high-severity vulnerability. It was published on December 15, 2016 and has a CVSS 3.0 base score of 7.5 (HIGH).

How severe is CVE-2016-4028?

This vulnerability has a CVSS 3.0 base score of 7.5, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2016-4028?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2016-4028?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2016-4028 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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