Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Open-Xchange | Ox Guard | <= 2.4.0 |
Related Weaknesses (CWE)
References
- http://www.securityfocus.com/archive/1/538732/100/0/threaded
- http://www.securitytracker.com/id/1036154Third Party AdvisoryVDB Entry
- http://www.securityfocus.com/archive/1/538732/100/0/threaded
- http://www.securitytracker.com/id/1036154Third Party AdvisoryVDB Entry
FAQ
What is CVE-2016-4028?
CVE-2016-4028 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 ...
How severe is CVE-2016-4028?
CVE-2016-4028 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2016-4028?
Check the references section above for vendor advisories and patch information. Affected products include: Open-Xchange Ox Guard.