CVE-2016-4028
7.5 · HIGHOverview
CVE-2016-4028 is a high-severity vulnerability affecting open-xchange ox_guard. 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 and patches from open-xchange. Update ox_guard to the latest patched version. 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.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| open-xchange | ox_guard | 0 | Affected |
Frequently Asked Questions
What is CVE-2016-4028?
CVE-2016-4028 is a high-severity vulnerability affecting open-xchange ox_guard. 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 and patches from open-xchange. Update ox_guard to the latest patched version. 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's AI-powered security agents can automatically detect CVE-2016-4028 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
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